BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Efficiency simulations of new Decay Spectrometer DTSTART;VALUE=DATE-TIME:20250327T084500Z DTEND;VALUE=DATE-TIME:20250327T090000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26450@indico.ific.uv.es DESCRIPTION:Speakers: Guang-Shun Li ()\nhttps://indico.ific.uv.es/event/79 09/contributions/26450/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26450/ END:VEVENT BEGIN:VEVENT SUMMARY:BigRIPS and PID for Decay Experiments DTSTART;VALUE=DATE-TIME:20250327T083000Z DTEND;VALUE=DATE-TIME:20250327T084500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26447@indico.ific.uv.es DESCRIPTION:Speakers: Shintaro Go (RIKEN)\nhttps://indico.ific.uv.es/event /7909/contributions/26447/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26447/ END:VEVENT BEGIN:VEVENT SUMMARY:New Decay at RIBF campaign and WAS3ABI DTSTART;VALUE=DATE-TIME:20250327T081000Z DTEND;VALUE=DATE-TIME:20250327T083000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26446@indico.ific.uv.es DESCRIPTION:Speakers: Shunji Nishimura ()\nhttps://indico.ific.uv.es/event /7909/contributions/26446/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26446/ END:VEVENT BEGIN:VEVENT SUMMARY:Welcome and Introductory remarks DTSTART;VALUE=DATE-TIME:20250327T080000Z DTEND;VALUE=DATE-TIME:20250327T081000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26445@indico.ific.uv.es DESCRIPTION:Speakers: Alejandro Algora (IFIC (CSIC-Univ. Valencia))\nhttps ://indico.ific.uv.es/event/7909/contributions/26445/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26445/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay spectroscopy of neutron-rich nuclei in south-west of $^{208} $Pb DTSTART;VALUE=DATE-TIME:20250328T140000Z DTEND;VALUE=DATE-TIME:20250328T141500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26417@indico.ific.uv.es DESCRIPTION:Speakers: Shunji Nishimura ()\nThe synthesis heavy elements\, such as gold and uranium\, remains one of the most profound mysteries in a strophysics. These elements are believed to form through rapid neutron cap ture process (r-process) in extreme astrophysical environments. To better understand this process\, it is crucial to study the structure and propert ies of very neutron-rich nuclei\, particularly their beta-decay half-lives and first excited states\, in the vicinity of the neutron magic number N= 126 and below. \n In this proposal\, more than 90 beta-decay half-lives\ , including $^{201}$Re and possibly $^{200}$W\, will be measured for the f irst time using the fragmentation of $^{208}$Pb. The beta-counting system WAS3ABi\, in conjunction with the new gamma-ray spectrometer\, will be emp loyed for these measurements. Additionally\, systematic studies of first e xcited states will be conducted via beta-gamma and the investigation of po ssible isomeric states. The experimental results will be incorporated into r-process network calculations to assess their impact on elemental abunda nces in solar\, metal-poor stars [1]\, and meteorites [2]. \n\n[1] A. Alen castro et al.\, arXiv: 2412.00195c1 (2024)\, Submitted to Astro. Astrophys .\n\n[2] T. Yokoyama\, R\, Walker\, Review in Mineralogy & Geochemistry Vo l. 81 pp. 107-160 (2016).\n\nhttps://indico.ific.uv.es/event/7909/contribu tions/26417/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26417/ END:VEVENT BEGIN:VEVENT SUMMARY:Towards the N=126 r-process waiting point nuclei: isomeric and bet a decays of 203Ir\, 202Os\, 201Re\, 200W (and 199Ta?) DTSTART;VALUE=DATE-TIME:20250328T134500Z DTEND;VALUE=DATE-TIME:20250328T140000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26421@indico.ific.uv.es DESCRIPTION:Speakers: Zsolt Podolyak ()\nWe aim to populate the most neutr on-rich N=126 nuclei accessible experimentally. The nuclei will be populat ed by the fragmentation of a high-intensity E/A=345 MeV 208Pb primary beam . The LoI requesting this development was approved by the RIKEN PAC in 202 2. The text below is from the physics proposal\, presented to the PAC. \nT he fragmentation products of interest will be implanted in an active Si st opper\, surrounded by a HPGe array. Their decay\, both beta and internal\, will be recorded. We expect to measure the beta-decay half-life of N=126 nuclei 203Ir\, 202Os\, 201Re\, 200W\, and possibly 199Ta. Most likely\, th e predicted isomeric states with11/2- πh11/2 of 203Ir and the 3/2+ πd3/2 of 201Re and 199Ta will also beta decay. The beta decays will provide inf ormation on the excited states of N=125 daughter nuclei and the competitio n between allowed and first-forbidden beta decays. Information on the stru cture of N=126 nuclei will be obtained by observing isomeric decays. Based on shell model predictions\, and further supported by systematics\, Iπ=1 0+\, 7-\, 5- isomers with πh11/2^2\, πh11/2d3/2 \, πh11/2s1/2 configura tions are expected in 200W and 202Os. In 201Re and 203Ir in addition to th e long-lived 11/2- metastable state\, 23/2+ πh11/2^2d3/2 isomers are expe cted. Additionally the same setting will allow the transmission of the N=1 27 isotones 204Ir\, and 203Os providing an opportunity to explore the prod uction of these (p\,n) charge-exchange reactions at E/A=345 MeV. N=127 iso tones are important to obtain detailed information on the lowest-lying exc ited levels in the N=126 nuclei to test the strength of the classic shell closure at N=126 and to shed light on the competition between allowed Gamo w-Teller (GT) and first-forbidden (FF) decays in N>126 nuclei. The informa tion gained will be important both for our understanding of the possible s hell evolution at the N=126 closed shell and to provide more robust theore tical predictions on the properties of the r-process path N~126 nuclei. We note that the same BIGRIPS setting will allow access to the shape transit ional region around 190-194W\, and will produce a significant number of is otopes for the first time.\n\nhttps://indico.ific.uv.es/event/7909/contrib utions/26421/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26421/ END:VEVENT BEGIN:VEVENT SUMMARY:Are 200Os and 202Os isotopes spherical? DTSTART;VALUE=DATE-TIME:20250328T131500Z DTEND;VALUE=DATE-TIME:20250328T133000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26444@indico.ific.uv.es DESCRIPTION:Speakers: Daniele Brugnara (LNL)\nThe study of neutron-rich os mium isotopes has revealed a gradual transition from prolate to oblate def ormation as neutrons are added. Among the most neutron-rich even-even isot opes where first excited states have been observed\, 196Os (N=120) was stu died via in-beam gamma-ray spectroscopy following multinucleon transfer re actions [1]\, while 198Os (N=122) was populated through fragmentation\, wi th its level scheme built from isomeric decay gamma rays [2].\n\nCompariso ns with beyond-mean-field calculations suggest a shift from axial rotation al behavior in lighter isotopes (e.g.\, 188Os) to vibrational spectra in h eavier ones (e.g.\, 198Os)\, passing through gamma-soft or triaxial config urations\, as observed in 196Os. The key question now is: what happens nea r the neutron shell closure at N=126? Will 200Os and 202Os be spherical\, or will deformation persist?\n\nTo address this\, we propose to measure th e gamma rays from the first excited states of 200Os and 202Os following th e isomeric decay of expected isomers using the new decay spectrometer at R IBF. A crucial aspect will be selecting the most effective fragmentation r eaction\, either 238U to populate 200Os and 202Os or cold fragmentation of 208Pb.\n\nThis experiment will provide critical insights into nuclear sha pe evolution near N=126\, testing shell closure robustness and advancing o ur understanding of nuclear deformation and collectivity in heavy neutron- rich nuclei.\n\n\n[1] P.R. John et al.\, PRC 90\, 021301(R) (2014).\n[2] Z s. Podolyak et al.\, PRC 79\, 031305(R) (2009).\n\nhttps://indico.ific.uv. es/event/7909/contributions/26444/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26444/ END:VEVENT BEGIN:VEVENT SUMMARY:Evolution of h11/2- orbital through new isomers near the 202Os DTSTART;VALUE=DATE-TIME:20250328T130000Z DTEND;VALUE=DATE-TIME:20250328T131500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26432@indico.ific.uv.es DESCRIPTION:Speakers: Yung Hee Kim (Center for Exotic Nuclear Studies\, IB S)\nWe propose to measure the energies of the low-lying excited states of neutron-rich isotopes at N=126 202Os and below through decay spectroscopy of isomeric states. The primary motivation of the proposed experiment is t o understand the shell evolution of π1h11/2 effective interactions. The e volution of the 1h11/2 orbital is crucial to study i) possible existence o f Z=76 subshell closure and evolution of N=126 magicity ii) -decay life time prediction in the r-process through competition between first forbidd en decay 1i13/2  1h11/2 and GT decay 1g9/2  1h11/2 [Mora l14\, Kuma24] iii) systematics study of NN interaction [Steer11\, Yuan22]. \nThe highlighted measurement case will be the measurement of i) the 2+ a nd 5-states in 202Os and ii) the search for the unknown 10+ isomeric state in 202Os and possibly 200W\nIn the measurements of the known even-A N=126 isotones\, the known isomeric states are 5- and 10+ states\, and the low- lying 2+ state will be populated by its decay. The configuration of the 5- and 10+state is dominated by the π(3s1/21h11/2) /(2d3/21h11/2) and π(1h 11/2-2)\, respectively\, which will be an ideal benchmark for the shell ev olution of π1h11/2 orbitals and associated effective interactions. The m easurement of 2+ energy in 202Os will provide strong evidence for the poss ible existence of subshell closure. \nThe isotope of interest will be popu lated through the fragmentation of the newly developed 208Pb beam on the 9 Be target. The gamma rays from the isomeric states will be measured by the 8 Clover detectors and 16 DEGAS detectors with a high efficiency of ~16% @ 1MeV. \n\n[Steer11] S. J. Steer et al.\, Phys. Rev. C 84\, 044313 (2011) \; S. J. Steer et al.\, Phys. Rev. C 78\, 061302 (2008).\n[Yuan22] C. Yuan et al.\, Phys. Rev. C 106\, (2022) 044314\n[Kumar24] A. Kumar et al.\, P hys. Rev. C 109\, 064319 \n[Moral14] A. I. Morales et al.\, Phys. Rev. L ett 113 (2014) 022702\n\nhttps://indico.ific.uv.es/event/7909/contribution s/26432/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26432/ END:VEVENT BEGIN:VEVENT SUMMARY:𝛽−𝛾 decay spectroscopy of 203Ir and 202Os: Probing contrib utions of first-forbidden 𝛽−decay in r-process nuclei DTSTART;VALUE=DATE-TIME:20250328T133000Z DTEND;VALUE=DATE-TIME:20250328T134500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26410@indico.ific.uv.es DESCRIPTION:Speakers: Youngju Cho (Seoul National University)\nThe nuclear structure and β-decay properties of neutron-rich nuclei near the N=126 s hell closure are important for understanding nuclear interaction in heavy nuclei and astrophysical processes. Sensitivity studies of r-process nucle osynthesis have shown that uncertainties in the predicted abundance around the A~195 peak depend considerably on the accuracy of β-decay rates of n eutron-rich nuclei\, especially those with proton numbers between Z=60 and Z=70. These isotopes\, however\, remain experimentally inaccessible at pr esent. Consequently\, astrophysical models for r-process rely on extrapola tions from nuclear theory. Here\, the relative contribution of First-Forbi dden (FF) β-decay has been considered important for the total decay rate. In contrast\, recent shell-model calculations suggest a reduced role of F F decays as proton number decreases\, introducing additional uncertainties in theoretical prediction of r-process nuclei.\nTo address this uncertain ty\, we propose measurements of the β-decay half-lives of 203Ir (Z=77) an d 202Os (Z=76)\, along with nuclear-structure studies of their daughter nu clei (203Pt and 202Ir) at the RIKEN Radioactive Isotope Beam Factory (RIBF ). Using a fragmentation reaction of a 345 MeV/u 208Pb beam\, neutron-rich isotopes will be produced\, separated\, and identified by the BigRIPS sep arator. Subsequent β-γ spectroscopy will be performed using the high-res olution and efficient ERUICA-2 (Euroball RIKEN Cluster Array) experimental setup. ERUICA-2 setup is expected to allow measurement of β-decay half-l ives and following γ-ray transitions\, providing insight into the signifi cance of FF decay in the 203Ir and 202Os.\n\nhttps://indico.ific.uv.es/eve nt/7909/contributions/26410/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26410/ END:VEVENT BEGIN:VEVENT SUMMARY:Investigation of trixiality in a "perfect" axially symmetric nucle us: the case of 170Dy DTSTART;VALUE=DATE-TIME:20250328T103000Z DTEND;VALUE=DATE-TIME:20250328T104500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26411@indico.ific.uv.es DESCRIPTION:Speakers: Sorin Pascu (IFIN-HH)\nThe exploration of nuclear tr iaxiality—where a nucleus exhibits three unequal principal axes—provid es profound insights into the structural dynamics of atomic nuclei. Recent theoretical advancements have highlighted the prevalence of triaxial shap es in heavy nuclei\, including isotopes located in the middle of the shell that were previously believed to be perfectly axially symmetric. The Mont e Carlo Shell Model (MCSM) predicts a high prevalence of triaxial deformat ion in this region through large-scale shell model calculations using effe ctive interactions [1\, 2]. The proxy-SU(3) and pseudo-SU(3) models\, two algebraic approaches\, also support the existence of triaxiality in the ra re-earth region [3–5]. Additionally\, the Triaxial Projected Shell Model (TPSM) or the Quasiparticle Random-Phase Approximation (QRPA) [6] further strengthens the case for triaxial deformation by predicting unique gamma- band structures characteristic of such nuclei [7].\n\nTo empirically valid ate these theoretical predictions\, we propose an experimental investigati on of the triaxial nature of 170Dy\, a nucleus located precisely at the ce nter of the Z = 50–82 and N = 82–126 major shells. This isotope will b e studied in a decay spectroscopy experiment with the new array of high-pu rity germanium detectors under development at RIBF. The high efficiency of this setup offers unique capabilities for precise gamma-ray spectroscopy\ , essential for resolving complex decay schemes and extracting accurate sp ectroscopic information. Our investigation will focus on detecting and ana lyzing gamma-ray emissions following the decay of the Jπ = 6+ isomer of 1 70Dy and of the beta decay of 170Tb to 170Dy\, for which very limited info rmation currently exists [8]. By constructing detailed level schemes and m easuring key observables\, such as energy spacings and branching ratios\, we aim to identify signatures indicative of triaxial deformation. These ne w data will be instrumental in benchmarking and refining theoretical model s\, thereby enhancing our understanding of nuclear shape coexistence and t he underlying mechanisms driving triaxiality in this region.\n\n\nReferenc es\n[1] T. Otsuka\, Physics 4\, 258 (2022)\n[2] T. Otsuka\, arXiv:2303.112 99v7 [nucl-th]. (2023)\n[3] D. Bonatsos\, A. Martinou\, S.K. Peroulis\, D. Petrellis\, P. Vasileiou\, T.J. Mertzimekis\, N. Minkov\, Journal of Phys ics G: Nuclear and Particle Physics 52\, 015102 (2024)\n[4] D. Bonatsos\, A. Martinou\, S.K. Peroulis\, D. Petrellis\, P. Vasileiou\, T.J. Mertzimek is\, N. Minkov\, Symmetry 16 (2024)\n[5] C.E. Vargas\, V. Velázquez\, S. Lerma-Hernández\, N. Bagatella-Flores\, The European Physical Journal A 5 3 (2017)\n[6] H. Watanabe\, G. Zhang\, K. Yoshida\, P. Walker\, J. Liu\, J . Wu\, P. Regan\, P.A. Söderström\, H. Kanaoka\, Z. Korkulu et al.\, Phy sics Letters B 760\, 641 (2016)\n[7] S. Jehangir\, G.H. Bhat\, J.A. Sheikh \, S. Frauendorf\, W. Li\, R. Palit\, N. Rather\, The European Physical Jo urnal A 57\, 308 (2021)\n[8] P.A. Söderström\, P. Walker\, J. Wu\, H. Li u\, P. Regan\, H. Watanabe\, P. Doornenbal\, Z. Korkulu\, P. Lee\, J. Liu et al.\, Physics Letters B 762\, 404 (2016)\n\nhttps://indico.ific.uv.es/e vent/7909/contributions/26411/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26411/ END:VEVENT BEGIN:VEVENT SUMMARY:Systematic study of rapid shape evolution of Ho-Yb-Hf in N=114-120 region DTSTART;VALUE=DATE-TIME:20250328T104500Z DTEND;VALUE=DATE-TIME:20250328T110000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26443@indico.ific.uv.es DESCRIPTION:Speakers: Yung Hee Kim (Center for Exotic Nuclear Stuides\, IB S)\nWe propose for systematic measurement of low lying states and beta dec ay half-life of Ho-Yb-Hf isotopes in unknown region N~114-120 to study i) sudden shape change expected in N~114-118 ii) half-life at the edge r-pro cess nuclei near N~120.\nThe Ho-Hf region is one of the least studied in t he nuclear chart\, where only lifetime up to N=110 is known in the case of Yb. The region of Yb presents a typical rotational structure R4/2~3.3 unt il 178Yb. The mean field calculations and IBM calculations expect the prol ate shape in N 118 similar to heavier Pt\, Os cases [Nomu11\, Robl09\, Yan g21]. The recent mass measurement in 178Yb presented a sudden change in th e systematics [Huan19]\, indicating a possible change in the structure muc h earlier than predicted. The systematic measurement of 2+ and 4+ states o f Hf-Yb-Ho isotopes in this region through beta decay can shed light on th e systematic shape evolution in this region. \nThe r-process and i-process network calculation studies [Mump16\,24 and Deni21] indicate the region w ith a large impact as well as the highest uncertainty in beta-decay half-l ife abundance occurs in 118≤N≤126. The systematic measurement of half -life near N=120 can directly measure the beta-decay half-life in this hig h-impact region. \n\n[Nomu11] K. Nomura et al.\, Phys. Rev. C 84\, (2011) 054316\n[Robl09] L.M. Robledo\, R. Rodriguez-Guzman\, P. Sarriguren\, J. Phys. G 36\, 115104 (2009)\n[Yang21] X. Q. Yang et al.\, Phys. Rev. C 103 (2021) 054321\n[Huan19]W. J. Huang et al.\, Eur. Phys. J. A\, 55 (2019)\, 96\n[Mump16\,24]M. R. Mumpower et al.\, Prog. Part. Nucl. Phys. 86 (2016) 86 \;M. Mumpower et al.\, ApJ 970 (2024) 173\n[Deni21] P. A. Denissenkov e t al. MNRAS503\, 3913–3925 (2021)\n\nhttps://indico.ific.uv.es/event/790 9/contributions/26443/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26443/ END:VEVENT BEGIN:VEVENT SUMMARY:Ground-state shape transition in the Z=70-74\, N~116 region DTSTART;VALUE=DATE-TIME:20250328T110000Z DTEND;VALUE=DATE-TIME:20250328T111500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26414@indico.ific.uv.es DESCRIPTION:Speakers: Quanbo Zeng (IMP\,CAS)\nThe ground-state shape chang e as a function of the number of protons or neutrons is a typical Quantum Phase Transition (QPT) phenomenon. In the southwest of $^{208}$Pb\, a shap e transition from prolate to oblate\, with a critical point around N=116\, is proposed to occur as the neutron number increases (D. Cline\, Annu. Re v. Nucl. Part. Sci. 36\, 683 (1986)). To date\, such evolution has been ex perimentally established in Pt and Os isotopic chains by gamma spectroscop y\, while IBM calculations suggest that the transition occurs more rapidly as one moves from Z = 76 (Os) toward Z = 70 (Yb) (K. Nomura\, et al.\, Ph ys. Rev. C 84\, 054316 (2011)). Additionally\, many K-isomers were identif ied in this region despite the proximity to the critical point N=116 (G. D . Dracoulis\, et al.\, Rep. Prog. Phys. 79\, 076301 (2016))\, which provid es a good opportunity to explore the level scheme below the isomer. With r ecent upgrades in beam intensities at RIKEN and the high efficiency of the upcoming advanced gamma detector array\, more exotic nuclei are now withi n reach for detailed investigation. Here\, we propose to search for K-isom ers in the Z=70-74\, N~116 region\, aiming to provide deeper insights into the shape transition in this area.\n\nhttps://indico.ific.uv.es/event/790 9/contributions/26414/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26414/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of neutron-rich nuclides in the A = 170−180 deformed regio n DTSTART;VALUE=DATE-TIME:20250328T111500Z DTEND;VALUE=DATE-TIME:20250328T113000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26408@indico.ific.uv.es DESCRIPTION:Speakers: Julgen Pellumaj (INFN-Mi\, INFN-LNL)\nThe availabili ty\, for higher intense beams at Riken\, of a 100 pnA $^{238}$U\, in combi nation with the increased efficiency of the $\\gamma$-ray detection array compared to the previous EURICA campaign\, opens the way to new experiment al studies in the largely unexplored region of neutron-rich rare-earth nuc lei. The structure of these nuclei is important from both nuclear astrophy sics and nuclear structure perspectives\, with respect to the r-process fo rmation of the rare-earth-element (REE) abundance peak\, nuclear shape cha nges and shell evolution [1]. \n\nWith this proposal\, we aim at investiga ting the neutron-rich nuclei with 170$\n\nhttps://indico.ific.uv.es/event/ 7909/contributions/26408/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26408/ END:VEVENT BEGIN:VEVENT SUMMARY:Structure and decay-properties of 53 $\\leq$ Z $\\leq$ 58 neutron- rich lanthanides (Xe-La) and the formation of the rare-earth abundance pea k DTSTART;VALUE=DATE-TIME:20250328T091500Z DTEND;VALUE=DATE-TIME:20250328T093000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26434@indico.ific.uv.es DESCRIPTION:Speakers: Gábor Gyula Kiss (HUN-REN Institute for Nuclear Res earch)\nThe solar r-process abundance distribution has a small but distinc t local maximum at A~160\, known as the rare-earth abundance peak (REP). T he REP formation is sensitive to both astrophysical and nuclear parameters . There are several different hypothesizes in the literature to understand the synthesis of these isotopes\, but experimental data (nuclear masses\, $\\beta$-decay parameters and nuclear structure information) are clearly necessary for fine-tuning the REP formation models [1\,2] (and references therein). \n\nIn the last decade a large effort was devoted to measure mas ses\, beta-decay half-lives and delayed neutron emission probabilities for neutron-rich unstable isotopes (see [3] for summary\, further references therein)\, however\, there is lack of such data for the lower mass lanthan ides. On the one hand side\, the most recent astrophysical sensitivity stu dy [4] highlighted that the description of the peak formation in a hot sce nario requires decay data on neutron-rich Xe-Ce isotopes not available at present. On the other hand side\, in the most recent mass measurement carr ied out for the neutron-rich $^{148-153}$La isotopes an unexpected sudden increase in the two neutron separation was found [5]. This change in the S $_{2n}$ trend might be due to the the predicted onset of quadrupole deform ation [6]. There is no information on the structure of the neutron-rich la nthanum isotopes with N $\\geq$ 83 and therefore\, we propose to study the level schemes in the mass region by measuring the $\\beta$-delayed $\\gam ma$ emission of neutron-rich Xe\, Cs and Ba isotopes. \n\nNote\, that the collected data might have a direct astrophysical relevance since recently lanthanide features in near-infrared spectra of kilonovae GW170817/AT2017g fo were found [7].\n\n\n[1] A. Arcones et al.\, Phys. Rev. C 83 (2011) 045 809.\n[2] M. Mumpower et al.\, Phys. Rev. C 85 (2012) 045801.\n[3] G. G. K iss and Zs. Podolyak\, Eur. Phys. J. 936 (2022) 107. \n[4] Y. W. Hao et al .\, Phys. Rev. C Lett. 108 (2023) L062802.\n[5] A. Jaries et al. Phys. Rev . Lett. 134 (2025) 042501.\n[6] J. Dobaczewski et al.\, Phys. Rev. Lett. 6 0 (1988) 2254.\n[7] N. Domoto et al.\, Astrophys. J. 939 (2022) 8.\n\nhttp s://indico.ific.uv.es/event/7909/contributions/26434/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26434/ END:VEVENT BEGIN:VEVENT SUMMARY:First spectroscopic studies on the very neutron-rich La isotopes o f 150La and 151La DTSTART;VALUE=DATE-TIME:20250328T093000Z DTEND;VALUE=DATE-TIME:20250328T094500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26431@indico.ific.uv.es DESCRIPTION:Speakers: Kailong Wang (Institute of Modern Physics\, Chinese Academy of Sciences)\nIn the neutron-rich regions around N≈60 and N≈90 \, well-known sudden shape transitions occur. These transitions are eviden ced by many aspects. From the view of ground-state energy\, a pronounced k ink in the trend of two-neutron separation energies ($S_{2n}$) and negativ e values of the neutron shell gap energies ($Δ_{2n}$) at N≈60 and N≈9 0. From the perspective of excited-state spectroscopy\, the excitation ene rgy of the first 2+ state and the $B(E2\; 2_1^+→0^+)$ value of even-even nuclei at N≈60 and N≈90 exhibit a sharp decrease and increase\, respe ctively.\n\nRecently\, a high-precision mass measurements of $^{148-153}$L a have revealed an unexpected sudden increase in $S_{2n}$ values from N=92 to N=94 for lanthanum isotopes [A. Jaries\, et al.\, PRL 134(2025)042501] . None of the existing nuclear mass models\, including phenomenological ma croscopic-microscopic methods and self-consistent mean-field approaches\, are capable of reproducing this observed bump. Instead\, all the modes sho w a relatively smooth linear decrease in the $S_{2n}$ values of $^{150}$La and $^{151}$La. Currently\, $^{149}$La is the most neutron-rich isotope f or which excited-state spectroscopy data are available. This spectroscopy data proposed a shape transition from octupolar to prolate deformation at N≥92. The role of the 9/2$^+$[404] proton extruder orbital was adopted t o explain the shift in the prominent bump observed in $S_{2n}$ values\, mo ving from N=90 in heavier isotopic chains to N=92 in the La isotopic chain . However\, more extensive spectroscopic studies on the more neutron-rich La isotopes are necessary to further understand this exotic shape-transiti on phenomenon.\n\nIn the last campaign of EURICA\, the β-decay half-lives of $^{150\,151}$Ba and $^{150\,151}$La were measured [J. Wu\, et al.\, PR L 118(2017)072701\, PRC 101(2020)042801(R)]. Using the new γ-ray detectio n array with enhanced efficiency\, along with increased $^{238}$U beam int ensity\, we propose to investigate the level structure of $^{150\,151}$La through β-decay spectroscopy of $^{150\,151}$Ba.\n\nhttps://indico.ific.u v.es/event/7909/contributions/26431/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26431/ END:VEVENT BEGIN:VEVENT SUMMARY:Isomer search and $\\beta$-decay studies in $^{166\,168}$Sm DTSTART;VALUE=DATE-TIME:20250328T094500Z DTEND;VALUE=DATE-TIME:20250328T100000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26427@indico.ific.uv.es DESCRIPTION:Speakers: Marta Polettini (GSI Helmholtzzentrum für Schwerion enforschung)\nThe neutron-rich rare-earth nuclei that lie mid-way between the proton shell-closures at Z=50\,82 are expected to display a maximum of quadrupole deformation close to the double mid-shell N=104\, Z=66. In add ition\, the appearance of deformed shell closures in this region\, which d epend on the interplay between single-particle and collective degrees of f reedom\, are important for understanding the $r$-process formation of the rare-earth-element (REE) abundance peak. \n\nNuclear deformation in these isotonic chains is connected to the appearance of 6+ and 8- K isomers with lifetimes greater than 100~ns. K-isomeric states provide stringent tests of contemporary nuclear models far from stability and allow access to low- lying excited states in such nuclei. Especially\, the evolution of the ene rgy of the first 2+ state along an isotopic chain shows a local minimum at N = 98 in Gd and Dy interpreted as the appearance of a deformed sub-shell gap which stabilizes the deformation. With increasing neutron number\, E( 2+) tend to decrease again towards the mid-shell\, developing a minimum at N = 104 in Er\, Yb and Dy\; but the behaviour for Gd\, Sm and Nd\, the la tter of which has the lowest E(2+) values\, is unknown.\n\nMoreover\, sama rium isotopes undergo $\\beta$ decay with half-lives of the order of a few hundred milliseconds\, making it possible to study the excited states in their n-rich Eu daughter nuclei\, for which information is mostly unknown at present. \n\nIn the Sm isotopic chain\, $^{164}$Sm is the most exotic n ucleus for which an isomer study was performed in the EURICA campaign. Bet a-decay half-lives in these isotopes were measured in recent studies in th e BRIKEN campaign\, while a measurement of half-lives together with discov ery of $\\beta$-decaying isomers was carried out at ATLAS in recent years. \n\nWe propose to measure low-lying excited states in $^{166\,168}$Sm and their daughters $^{166\,168}$Eu nuclei for the first time\, exploiting in- flight fission of a 345~MeV/u $^{238}$U beam. Additionally\, we would like to extend the presently-known level scheme in $^{164}$Sm. The newly-avail able 100~pnA beam intensity\, in combination with the increased efficiency of the $\\gamma$ detection array compared to previous campaigns\, will al low us to reach these exotic species with sufficient statistics to perform gamma spectroscopy.\n\nhttps://indico.ific.uv.es/event/7909/contributions /26427/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26427/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay Spectroscopy of Neutron-Rich Rh and Ru Isotopes Towards N=82 DTSTART;VALUE=DATE-TIME:20250328T081500Z DTEND;VALUE=DATE-TIME:20250328T083000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26440@indico.ific.uv.es DESCRIPTION:Speakers: Zhihuan Li ()\nWe propose studying neutron-rich Rh and Ru isotopes near N=82\, up to 126Rh and 124Ru\, using beta decay and i somer spectroscopy with a new gamma detection array. The primary goal of t his proposal is to test the persistence of the N=82 shell closure\, which is robust in Cd and Pd isotopes but remains uncertain for Z\n\nhttps://ind ico.ific.uv.es/event/7909/contributions/26440/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26440/ END:VEVENT BEGIN:VEVENT SUMMARY:Exploring the proton and neutron shell evolution in the “South-w est” of doubly magic 132Sn DTSTART;VALUE=DATE-TIME:20250328T083000Z DTEND;VALUE=DATE-TIME:20250328T084500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26429@indico.ific.uv.es DESCRIPTION:Speakers: Zhiqiang Chen (GSI)\nThe monopole-driven shell evolu tion has been revealed in the south of doubly magic $^{132}$Sn for both ne utron and proton shells. From the neutron shell side\, an inversion of the $3/2^{+}$ and $11/2^{-}$ state\, which corresponds to the neutron $d_{3/2 }$ and $h_{11/2}$ orbitals\, respectively\, from $^{131}Sn_{81}$ to $^{129 }Cd_{81}$\, has been discovered in a recent mass measurement. According to the trend\, the splitting between neutron $d_{3/2}$ and $h_{11/2}$ orbita ls is getting larger from $^{129}$Cd$_{81}$ to $^{127}$Pd$_{81}$ where the $3/2^{+}$ state has not been discovered yet. From the proton shell side\, a reduction of $Z$ = 40 sub-shell gap\, which is formed by proton $p_{1/2 }$ and $g_{9/2}$ orbitals\, was suggested at $N$ = 82 in Ag isotopes by an extrapolation from the last known data point at $^{125}$Ag. The $1/2^{-}$ state has not been discovered yet in $^{127}$Ag. According to the systema tics\, long-lived beta isomers $3/2^{+}$ and $11/2^{-}$ are expected in $^ {127}$Pd and $1/2^{-}$ and $9/2^{+}$ are expected in $^{127}$Ag. By establ ishing the beta-decay level scheme through the $^{127}$Pd $\\rightarrow$ $ ^{127}$Ag $\\rightarrow$ $^{127}$Cd decay chain\, combined with possible m ass measurements using MR-TOF-MS\, we can assess whether a significant cha nge occurs in the proton subshell gap and neutron major shell gap in this region.\n\nhttps://indico.ific.uv.es/event/7909/contributions/26429/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26429/ END:VEVENT BEGIN:VEVENT SUMMARY:Perspectives for decay spectroscopy in the region beyond 132Sn DTSTART;VALUE=DATE-TIME:20250328T080000Z DTEND;VALUE=DATE-TIME:20250328T081500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26424@indico.ific.uv.es DESCRIPTION:Speakers: Andrea Jungclaus (IEM-CSIC)\nIn this contribution\, I will present my personal view of the perspectives of decay spectroscopy experiments at RIBF in the years 2026/2027 in the region south-east of dou bly-magic 132Sn. This view is based on past experience and theoretical exp ectation and considers isomeric decays\, the observation of beta-delayed g amma radiation\, as well as beta-decay half-lives.\n\nhttps://indico.ific. uv.es/event/7909/contributions/26424/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26424/ END:VEVENT BEGIN:VEVENT SUMMARY:Question on the robustness of N = 82 shell closure and seniority c onservation of g9/2 shell in south 132Sn region DTSTART;VALUE=DATE-TIME:20250328T084500Z DTEND;VALUE=DATE-TIME:20250328T090000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26435@indico.ific.uv.es DESCRIPTION:Speakers: Guang-shun LI (IMP)\nOver the past few decades\, res earch have revealed that some nuclear magic numbers can shift or disappear in regions where significant imbalance between the number of protons and neutrons exist. It remains an open question whether such a change can occu r for N = 82 in south 132Sn region. If the shell gap is reduced\, it becom es easier for particles to be excited across the shell. which drives the n uclear system toward a more collective behavior. As a result\, excitation energies and transition probabilities may deviate from what is expected ba sed on the seniority scheme. Whether seniority is conserved in the  g9/ 2 shell for the N = 82 isotones is another open question worth investigati on. So far\, 8+ isomeric states have been identified in 130Cd (A. Jungclau s et al.\, PRL 99\, 132501 (2007)) and 128Pd (H. Watanabe et al.\, PRL 111 \, 152501 (2013)). The identification of those seniority isomers has revea led the robustness of the N = 82 shell closure for Z = 48 and Z = 46. Stil l the question arises how the g9/2 shell evolves for larger proton to neut ron unbalance and\, in general if seniority is conserved. Partial conserva tion of seniority for the g9/2 shell has been suggested for Z = 82 and N = 50 shell closures (J. Valiente Dobon et al.\, PLB 816 136183 (2021)\, B. Das et al.\, Phys. Rev. Research 6 L022038 (2024)) and linked to the phase of Berry. To find out if far below 132Sn an erosion of N = 82 shell closu re takes place\, and whether the partial conservation remains\, we need to study lighter isotones. With the recent upgrades of beam intensities at R IKEN\, and the higher performances of the planned new gamma detector array \, those systems are becoming accessible to nuclear structure studies. We propose therefore to focus our research on nuclei in the south 132Sn regio n\, such as 126Ru\, 124Mo\, 129Ag\, 127Rh\, 124Ru\, 130Pd\, and 132Cd etc. Spectroscopic studies of these nuclei could provide a deep understanding of the complicated many-body fermionic system in a very exotic nuclear reg ion.\n\nhttps://indico.ific.uv.es/event/7909/contributions/26435/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26435/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay Spectroscopy of Neutron-Rich Sn Isotopes DTSTART;VALUE=DATE-TIME:20250328T090000Z DTEND;VALUE=DATE-TIME:20250328T091500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26409@indico.ific.uv.es DESCRIPTION:Speakers: Phong Vi (RIKEN)\nNeutron-rich tin (Sn) isotopes pla y a pivotal role in the rapid neutron-capture process (r-process)\, a key mechanism for synthesizing heavy elements in extreme astrophysical environ ments. The interplay of slower $\\beta$-decay rates relative to neutron-ca pture rates - driven by shell effects near $Z = 50$ - delays the r-process flow\, forcing material to undergo successive neutron captures until a br eakout point is reached\, where sufficiently short half-lives enable furth er nucleosynthesis [1]. This threshold\, potentially near $^{140}$Sn ($N = 90$)\, depends on whether the neutron density of the astrophysical site o utpaces the r-process timescale [2]. Systematic studies of half-lives of n eutron-rich Sn isotopes are thus critical to inferring the neutron-density threshold and constraining r-process conditions. Recent sensitivity studi es further underscore the importance of $^{140}$Sn half-lives\, demonstrat ing their significant impact on final r-process abundances [3].\n\nTheoret ically\, the half-lives of neutron-rich Sn isotopes are supposed to be sen sitive to the deformation effects [4]. Some models predict a new subshell closure at $N = 90$ [5\, 6]\, yet experimental evidence remains sparse [7\ , 8]. Comparisons to the $^{78}$Ni region\, where magicity influences half -lives\, highlight the need for direct measurements [9].\n\nWe propose an experiment focusing on the $\\beta$-decay half-lives of neutron-rich $^{14 0}$Sn and $^{141}$Sn (and vicinity isotopes in cocktail beam) within the p ost-EURICA project at RIBF. Building on prior statistics in other $\\beta$ -decay experiments [7\, 10]\, projected beam intensities\, LISE++ simulati ons [11]\, and recent BigRIPS machine studies\, these isotopes are now exp erimentally accessible. Beyond half-lives\, isomer and $\\beta$-$\\gamma$ spectroscopy will probe low-lying states\, elucidating shell evolution nea r $N = 90$. These measurements will provide critical benchmarks for nuclea r structure models and r-process simulations\, advancing our understanding of heavy-element formation.\n\n[1] S. Shibagaki et al.\, ``Relative Contr ibutions of the Weak\, Main\, and Fission-Recycling r-Process\,''\, ApJ 81 6\, 79 (2016).\n\n[2] J. Van Schelt et al.\, ``First Results from the CARI BU Facility: Mass Measurements on the r-Process Path\,''\, Phys. Rev. Lett . 111\, 061102 (2013).\n\n[3] M. R. Mumpower et al.\, ``The Impact of Indi vidual Nuclear Properties on r-Process Nucleosynthesis\,''\, Prog. Part. N ucl. Phys.. 86 (2016).\n\n[4] P. Moller et al.\, ``Nuclear properties for astrophysical and radioactive-ion-beam applications (II)\,''\, ADNDT 125\ , 1 (2019)\; P. Moller\, private communication.\n\n[5] S. Sarkar and M. Sa ha Sarkar\, ``New Shell Closure for Neutron-Rich Sn Isotopes\,''\, Phys. R ev. C 81\, 064328 (2010).\n\n[6] A. R. Vernon et al.\, ``Nuclear Moments o f Indium Isotopes Reveal Abrupt Change at Magic Number 82\,''\, Nature 607 \, 260 (2022)\; PREPRINT (Version 1) available at Research Square [https:/ /doi.org/10.21203/rs.3.rs-611360/v1].\n\n[7] G. S. Simpson et al.\, ``Yras t 6+ Seniority Isomers of $^{136\,138}$Sn\,''\, Phys. Rev. Lett. 113\, 132 502 (2014).\n\n[8] A. Jungclaus et al.\, ``Position of the Single-Particle 3/2$^-$ State in $^{135}$Sn and the $N=90$ Subshell Closure\,''\, Phys. L ett. B 851\, 138561 (2024).\n\n[9] Z. Y. Xu et al.\, ``$\\beta$-Decay Half -Lives of $^{76\,77}$Co\, $^{79\,80}$Ni\, and $^{81}$Cu: Experimental Indi cation of a Doubly Magic $^{78}$Ni\,''\, Phys. Rev. Lett. 113\, 032505 (20 14).\n\n[10] V. H. Phong et al.\, ``$\\beta$-Delayed One and Two Neutron E mission Probabilities South-East of $^{132}$Sn and the Odd-Even Systematic s in r-Process Nuclide Abundances\,''\, Phys. Rev. Lett. 129\, 172701 (202 2).\n\n[11] V. H. Phong et al.\, ``Mass measurements beyond $^{132}$Sn rea ching the r-process path\,''\, NP2212-RIBF216 accepted proposal at RIBF (2 022).\n\nhttps://indico.ific.uv.es/event/7909/contributions/26409/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26409/ END:VEVENT BEGIN:VEVENT SUMMARY:Shape coexistence in 60Ti and 64Cr DTSTART;VALUE=DATE-TIME:20250327T162000Z DTEND;VALUE=DATE-TIME:20250327T164000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26422@indico.ific.uv.es DESCRIPTION:Speakers: Byul Moon (CENS\, IBS)\nThe island of inversion\, wh ere the ground and excited states exchange their nuclear deformation\, is one of the cornerstones to investigate nuclear shell evolution in nuclei w ith the extreme neutron-proton ratios. $^{64}$Cr is the key nucleus for th is island of inversion at N = 40 with multi particle and multi hole (np-nh ) configurations. Recently\, the in-beam $\\gamma$-ray spectroscopy carrie d out at FRIB measured the $0^{+}_{2}$ state in $^{62}$Cr with angular mom entum distribution [A. Gade et al.\, Nat. Phys. 21\, 37 (2025)]. From this measurement\, the ground state was suggested to be formed by the 4p-4h co nfiguration while the excited $0^{+}$ state originated from the 2p-2h conf iguration by comparing with theoretical predictions. These findings opened a portal to the island of inversion and shape coexistence in this N = 40 region.\n\nIn this presentation\, we propose to measure the excited states in even-even Ti and Cr isotopes other than ground band structures to thor oughly investigate the np-nh configurations through the $\\beta$-delayed $ \\gamma$-ray spectroscopy. Particularly\, we point out that $^{60}$Ti and $^{64}$Cr nuclei\, the isotone and isotope of $^{62}$Cr\, respectively\, p lay important roles in this island of inversion and shape coexistence.\n\n https://indico.ific.uv.es/event/7909/contributions/26422/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26422/ END:VEVENT BEGIN:VEVENT SUMMARY:Nuclear shell structure of 80Zn: shape coexistence at N = 50 DTSTART;VALUE=DATE-TIME:20250327T160000Z DTEND;VALUE=DATE-TIME:20250327T162000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26416@indico.ific.uv.es DESCRIPTION:Speakers: Byul Moon (CENS\, IBS)\n$^{78}$Ni is now being under stood as a doubly magic nucleus [R. Taniuchi et al.\, Nature 569\, 53 (201 9)]. Moreover\, from the experimental findings this nucleus may have a def ormed excited state\, which is strongly related to shape coexistence. Unfo rtunately\, however\, it is still extremely difficult to directly investig ate not only this $^{78}$Ni but also $^{79}$Ni and $^{79}$Cu for more spec troscopic information. Moreover\, recent theoretical works predict a new i sland of inversion at N = 50 below $^{78}$Ni. Therefore\, it is of great i mportance to investigate the N = 50 isotones\, and $^{80}$Zn is one of the key nuclei playing a crucial role in this feature.\n\nCurrently\, the int ernal level scheme of $^{80}$Zn is limited to the ground band structure. S ome excited states were observed\, but the exact spins and parities could not be firmly determined. From this proposal\, therefore\, we aim to measu re the excited states\, in particular the $2^{+}_{2}$ and $0^{+}_{2}$ stat es in $^{80}$Zn through the $\\beta$-delayed $\\gamma$-ray spectroscopy of $^{80}$Cu. The successful measurement will expand our understanding of sh ell structure along N = 50 and further develop the shell model calculation to predict the possible island of inversion at N = 50 below $^{78}$Ni.\n\ nhttps://indico.ific.uv.es/event/7909/contributions/26416/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26416/ END:VEVENT BEGIN:VEVENT SUMMARY:Shape coexistance in the N=40 Island of Inversion DTSTART;VALUE=DATE-TIME:20250327T151500Z DTEND;VALUE=DATE-TIME:20250327T153000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26438@indico.ific.uv.es DESCRIPTION:Speakers: Bruno Olaizola Mampaso (IEM - CSIC)\nIslands of Inve rsion (IoI) are among the most intriguing phenomena in nuclear structure r esearch. One of the least understood is the so-called $N=40$ IoI\, centred around $^{64}$Cr ($Z=24$\, $N=40$). Situated just below the spherical $^{ 68}$Ni ($Z=28$\, $N=40$)\, the interplay between the negative-parity $pf$ neutron shell and the positive-parity $g_{9/2}$ and $d_{5/2}$ orbitals (sp anning the well-established $N=50$ shell gap) induces a strong deformation [1].\n\nDespite the growing interest in this region of the nuclear chart\ , very little is known about $^{64}$Cr due to its challenging production. Reaction-based studies have tentatively identified the yrast band up to th e $6^+$ state\, and a Coulex experiment measured the B(E2) of the first $2 ^+$ state\, albeit with a large error bar [2]. An experiment at the NSCL s tudied the beta decay of $^{64}$V but observed only 3 or 4 counts of the $ 2^+ \\rightarrow 0^+$ transition [3].\n\nThe combination of a high-efficie ncy HPGe array with RIBF’s ability to produce highly exotic isotopes pre sents a unique opportunity for the first comprehensive spectroscopy of $^{ 64}$Cr. One of the main goals of the experiment is to identify the propose d excited $0^+$ state\, which would provide crucial evidence for shape coe xistence in this region. Furthermore\, this experiment would significantly complement the already approved NP1812-RIBF232\, which aims to perform li fetime measurements in nearby nuclei.\n\n[1] S. M. Lenzi\, et al. Phys. Re v. C\, 82:054301\, 2010\n[2] H. L. Crawford\, et al. Phys. Rev. Lett.\, 11 0:242701\, 2013\n[3] S. Suchyta\, et al. Phys. Rev. C\, 89:067303\, 2014\n \nhttps://indico.ific.uv.es/event/7909/contributions/26438/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26438/ END:VEVENT BEGIN:VEVENT SUMMARY:Beta-delayed gamma ray spectroscopy N=40-N=50 DTSTART;VALUE=DATE-TIME:20250327T153000Z DTEND;VALUE=DATE-TIME:20250327T154500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26412@indico.ific.uv.es DESCRIPTION:Speakers: Andrea Gottardo (INFN LNL)\nThe first spectroscopy o f $^{78}$Ni suggested that the nucleus act as separation between a region. of sphericity and an island of deformation developing around N=50 for Z12 MeV) for $^{71\,72}$Mn and $^{73\,74}$Fe. Therefore\, beta-decay spectros copy of $^{71\,72}$Mn will populate excited levels in $^{70\,71}$Fe and be ta decay of 73\,74Fe excited levels in $^{72\,73}$Co. Search for seniority isomers in $^{75-77}$Co could also provide information on the level schem es of these nuclei. The isotopes of interest will be produced by the fragm entation-fission of a primary $^{238}$U beam on the RIBF Be target. The se parated fragmentation products will be implanted in the WAS3ABI Si array. The $\\beta$-delayed $\\gamma$-rays as well as the isomer decays will be studied with the HPGe array.\n\nhttps://indico.ific.uv.es/event/7909/contr ibutions/26412/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26412/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay spectroscopy around 78Ni DTSTART;VALUE=DATE-TIME:20250327T154500Z DTEND;VALUE=DATE-TIME:20250327T160000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26442@indico.ific.uv.es DESCRIPTION:Speakers: Shintaro Go (RIKEN)\nSystematic study such as of the level structure and decay half lives in exotic nuclei are important to te st the persistence of the shell structure. The EURICA project has deepened the understanding around the 78Ni region with the massive amount of decay data (e.g. [1]). The new gamma-ray spectrometer at RIBF could have a capa bility to extend the region with its higher gamma-ray detection efficiency and also with the increased primary beam intensity of 238U and 70Zn. \n In this presentation\, several physics cases related to the region from ne utron-rich Ca to Ni will be discussed based on the results of the EURICA & BRIKEN collaborations. \n\n[1] Z. Y. Xu\, S. Nishimura et al.\, Phys. R ev. Lett. 113\, 032505 (2014).\n\nhttps://indico.ific.uv.es/event/7909/co ntributions/26442/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26442/ END:VEVENT BEGIN:VEVENT SUMMARY:Exotic decays and octupole collectivity of neutron-deficient Ba re gion DTSTART;VALUE=DATE-TIME:20250327T140000Z DTEND;VALUE=DATE-TIME:20250327T141500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26430@indico.ific.uv.es DESCRIPTION:Speakers: Rin Yokoyama ()\nThe neutron-deficient isotope ¹¹ ²Ba is possibly the heaviest N=Z nucleus\, providing a unique opportunity to explore exotic nuclear phenomena. Two particularly interesting aspects in this region are exotic decay modes and octupole deformation.\n\nSuper- allowed alpha decay is a type of alpha decay where the emission of an alph a particle is significantly enhanced due to strong proton-neutron interact ions\, as the valence nucleons occupy identical orbitals on the doubly mag ic ¹⁰⁰Sn core. The alpha-decay chain ¹⁰⁸Xe → ¹⁰⁴Te → ¹ ⁰⁰Sn was experimentally observed [1]\, but only an upper limit for the half-life of ¹⁰⁴Te was reported. From this\, the authors concluded t hat at least one of ¹⁰⁴Te or ¹⁰⁸Xe must have an alpha preformati on factor greater than 5\, indicating the existence of super-allowed alpha decay. This decay chain was remeasured at RIBF as RIBF-168\, and the resu lts are yet to be published. It remains an open question whether the ¹¹ ²Ba → ¹⁰⁸Xe decay also exhibits a large preformation factor.\n\nCl uster radioactivity has long been a subject of theoretical interest\, thou gh experimental evidence\, such as ¹²C emission\, remains elusive. Theor etical predictions for the half-life of ¹²C decay from the ¹¹²Ba regi on vary significantly [2\,3]\, primarily due to uncertainties in model Q-v alues and other parameters. Some calculations predict half-lives shorter t han the experimental lower limit of ¹²C decay from ¹¹⁴Ba [4]\, sugge sting that current models are not yet reliable. Experimental measurements of Q-values\, particle decay energies\, and half-lives in this region are crucial for constraining and validating theoretical models predicting such exotic cluster decays.\n\nMoreover\, the region around ¹¹²Ba (Z=N=56) is particularly interesting due to its predicted octupole collectivity. Nu clei where N or Z = 34\, 56\, 88\, and 134 are considered octupole magic\, owing to strong octupole correlations among orbitals at the Fermi surface . Experimental evidence from neutron-rich Ba isotopes at N=88 strongly sup ports this octupole collectivity\, with observed low-energy 3⁻ states an d large B(E3) values. Recent theoretical studies\, employing self-consiste nt mean-field calculations with the Gogny-D1M functional and Interacting B oson Model (IBM) calculations [7]\, predict that octupole deformation also appears in lighter isotopes\, notably ¹¹²Ba and ¹¹⁴Ba\, where 3⁻ states are expected to lie below 1 MeV. The same study predicts 3⁻ stat es slightly above 1 MeV in ¹¹⁰Xe and ¹¹²Xe. Direct experimental con firmation of these states via gamma-ray spectroscopy would be crucial for verifying these theoretical models.\n\nPossible measurements at RIBF of th is region will be discussed.\n\n[1] K. Auranen et al.\, Phys. Rev. Lett. 1 21 182501 (2018)\n[2] Yonghao Gao et al.\, Sci. Rep. 10\, 9119 (2010)\n[3] Joshua T. Majekodunmi et al.\, Phys. Rev. C 105\, 044617 (2022)\n[4] C. M azzocchi et al.\, Phys. Lett. B 532\, 29-36 (2002)\n[5] B. Bucher et al.\, Phys. Rev. Lett. 116\, 112503 (2016)\n[6] B. Bucher et al.\, Phys. Rev. L ett. 118\, 152504 (2017)\n[7] K. Nomura et al.\, Phys. Rev. C 104\, 054320 (2021)\n\nhttps://indico.ific.uv.es/event/7909/contributions/26430/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26430/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay spectroscopy and mass measurement of p-rich nuclides with N= 80-84 DTSTART;VALUE=DATE-TIME:20250327T141500Z DTEND;VALUE=DATE-TIME:20250327T143000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26425@indico.ific.uv.es DESCRIPTION:Speakers: zhong Liu (Institute of Modern Physics\, Chinese Aca demy of Sciences)\nInvestigation on the shell evolution far from stability is one of the core tasks of contemporary nuclear physics. Recently the N= 82 shell gap at Z=74 obtained in the decay of new isotopes 160Os and 156W [1\,2] confirmed theoretical predictions which show robust magicity of the next self-conjugate 164Pb.\nIsomers are common in the proximity of N=82\, such as the seniority and spin trap isomers in nuclei with N=80-84 spanni ng between the extremes of proton and neutron excess. For example\, recent ly\, we have identified the long-sought-after 10+ isomer in 150Yb [4]\, ma king 10+ isomers established in N=80 isotones between Z=46 [5] and 70. \nT he N=82 shell gap crosses the proton drip line at Z=71\, a rich variety of decay modes (p/$\\alpha$/$\\beta$+/EC/$\\gamma$) are open for ground stat es and isomers. We propose to continue the search for such isomers in more p-rich nuclei with N=80-84. The N=82 shell closure could be investigated by mass measurement for these nuclei. +/EC decay spectroscopy of nuclid es with N=80\,81 will shed light on the shell gap as well. Lifetimes measu rements of states populated by the isomer decay using the fast-timing meth od will be crucial for testing and improving nuclear structure models for the more exotic nuclei. \n\nReferences \n[1] A.D. Briscoe et al.\,Phys. Le tt. B 847\, 138310 (2023)\n[2] H.B. Yang et al.\, accepted by Phys. Rev. L ett. 132\, 072502 (2024)\n[3] J.J. Valiente-Dobón \, et al.\, Phys Rev. C 69\, 024316 (2004) \n[4] W.Q. Zhang\, Z.Liu et al.\, in preparation.\n[5] H. Watanabe et al.\, Phys. Rev. Lett. 113\, 042502 (2014)\n\nhttps://indi co.ific.uv.es/event/7909/contributions/26425/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26425/ END:VEVENT BEGIN:VEVENT SUMMARY:Neutron-deficient Po\, Pb nuclei: navigating towards the dripline DTSTART;VALUE=DATE-TIME:20250327T143000Z DTEND;VALUE=DATE-TIME:20250327T144500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26415@indico.ific.uv.es DESCRIPTION:Speakers: Andrea Gottardo (INFN LNL)\nNeutron-deficient Pb nuc lei feature unique shape coexistence with oblate\, prolate and spherical s hapes coexisting with few hundred keV in $^{186}$Pb. Not much is known in lighter Pb isotopes\, with the spectroscopic knowledge vanishing at $^{178 }$Pb. The structure of Pb isotopes with A\n\nhttps://indico.ific.uv.es/eve nt/7909/contributions/26415/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26415/ END:VEVENT BEGIN:VEVENT SUMMARY:Isospin symmetry at 100Sn DTSTART;VALUE=DATE-TIME:20250327T130000Z DTEND;VALUE=DATE-TIME:20250327T131500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26428@indico.ific.uv.es DESCRIPTION:Speakers: Magdalena Gorska (GSI)\nThe N=Z=50 nucleus\, 100Sn\, is the heaviest self-conjugate and doubly magic nucleus that remains stab le against particle emission\, making it an exceptional candidate for shel l-model studies aimed at deepening our understanding of the nuclear force. \nIts structure is dominated by the strong proton-neutron interaction with in the 0g9/2 orbital\, leading to unique features such as spin gaps\, seni ority effects\, parity-changing isomerism\, and proton-neutron pairing cor relations.\nFor the most neutron-deficient isotopes in this region—speci fically those with Tz\n\nhttps://indico.ific.uv.es/event/7909/contribution s/26428/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26428/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay study of 95Cd and 86Tc DTSTART;VALUE=DATE-TIME:20250327T131500Z DTEND;VALUE=DATE-TIME:20250327T133000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26419@indico.ific.uv.es DESCRIPTION:Speakers: Xiaoyu Liu (RIKEN/HKU)\nThe structure of 95Ag and sh ell model calculations suggest that gamma-decaying isomers may exist in 95 Cd. With the new HPGe array\, decay studies can be used to investigate the structure of 95Cd\, which will allow for a comparison with 95Ag to explor e isospin symmetry. In the N=Z odd-odd nucleus 86Tc\, there is a possibili ty that a T=0 5⁺ isomer exists. If the state is above the proton separat ion energy\, it might decay via short-lived proton emission\; however\, if the spin alignment lowers its energy\, it could instead undergo beta deca y. So\, I propose to measure the decay of 95Cd and 86Tc with the F11 decay setup.\n\nhttps://indico.ific.uv.es/event/7909/contributions/26419/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26419/ END:VEVENT BEGIN:VEVENT SUMMARY:Towards $^{100}$Sn along the N=Z line DTSTART;VALUE=DATE-TIME:20250327T133000Z DTEND;VALUE=DATE-TIME:20250327T134500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26437@indico.ific.uv.es DESCRIPTION:Speakers: Alejandro Algora (IFIC (CSIC-Univ. Valencia))\n$^{10 0}$Sn is the last double magic N=Z nucleus that remains stable considering particle emission. Studying its beta decay is challenging and interesting [1-3]\, since it is very difficult to produce and the beta decay of $^{10 0}$Sn shows the lowest estimated Logft or the largest B(GT) (superallowed Gamow-Teller (GT) transition) in the entire nuclide chart. This decay also holds the key for a better understanding of the quenching of the $g_A$ co nstant in the nuclear medium. Up to know the limited production has constr ained the possibility of establishing a firm level scheme populated in the beta decay. The present level scheme of the beta decay into $^{100}$In i s based on very limited gamma-gamma coincidences and on a comparison with shell model predictions [1\,2]. We propose here to further study the beta decay of $^{100}$Sn using the upgraded intensities of the primary beams at RIFB and the improved efficiency of the new gamma array. \n\nAround $^{10 0}$Sn\, it is also worth studying further the beta decay of $^{98}$Cd. The only data available related to this decay comes from a study performed at ISOLDE in 1992 with limited efficiency [4]. $^{98}$Cd beta decay is one o f the cases which resembles better the $^{100}$Sn decay. Recent mass measu rements in the region [5] seem to fix partially the conflict of the two di fferent B(GT) values obtained by Hinke et al. [1] and Lubos et al. [2]\, b y looking at the trends predicted by shell model calculations and relying on the beta strength of this decay determined at ISOLDE [4]. Considering t he relevance of this data\, a new study of its beta decay using a more eff icient setup is also desirable.\n\n\n[1] C.B. Hinke\, et al.\, Nature 486 (2012) 341.\n[2] D. Lubos\, et al.\, Phys. Rev. Lett. 122 (2019) 222502.\n [3] T. Faestermann\, et al.\, Prog. Part. Nucl. Phys. 69 (2013) 85\; M. G órska\, Physics 4 (2022) 364.\n[4] A. Plochocki et al.\, Z. Phys. A Hadro ns and Nuclei 342\, (1992) 43 \n[5] A. Mollaebrahimi et al.\, Physics Lett ers B 839 (2023) 137833\n\nhttps://indico.ific.uv.es/event/7909/contributi ons/26437/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26437/ END:VEVENT BEGIN:VEVENT SUMMARY:Decay spectroscopy of the most neutron-deficient nuclei close to 1 00Sn DTSTART;VALUE=DATE-TIME:20250327T134500Z DTEND;VALUE=DATE-TIME:20250327T140000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26413@indico.ific.uv.es DESCRIPTION:Speakers: Joochun (Jason) Park (Center for Exotic Nuclear Stud ies\, IBS)\nThe discovery of the most neutron-deficient nuclei in the $^{1 00}$Sn region has opened possibilities for new and more precise spectrosco py experiments\, especially in light of the increased primary beam intensi ty of $^{124}$Xe at RIKEN RIBF and a combined array of HPGe detectors for high $\\gamma$-ray efficiency. The three major topics are presented below. \n\nShell model calculations showed a staggered decrease in the proton sep aration energies for both $^{92}$Ag and $^{96}$In\, which were discovered in a previous EURICA experiment. Sufficiently long half-lives are hypothes ized\, where proton emission is delayed by the $l = 4$ centrifugal barrier of the $\\pi g_{9/2}$ orbital. The half-life of $^{93}$Ag was deduced to be 228(16) ns\, based on a fraction of nuclei that survived the flight thr ough BigRIPS and the ZeroDegree spectrometer. On the other hand\, a hypoth etical proton-unbound isomer in $^{97}$In was previously suggested. First proton decay spectroscopy of $^{92\,93}$Ag and $^{96\,97}$In will enable n ew measurements of mass differences in these dripline nuclei and enrich th eories on proton emission. Furthermore\, potentially new $p$-delayed $\\ga mma$-ray data may be obtained to unveil new excited states in $^{91\,92}$P d and $^{95\,96}$Cd.\n\nIn light of the series of lifetime measurements of all but the $2^{+}$ state in $^{98}$Cd\, the test of isospin symmetry in $^{98}$Sn is more essential than ever. It is the unique candidate for meas uring both the energy and the $B(E2)$ values to complete the heaviest pair of semi-magic mirror nuclei in the nuclear chart. The structure of $^{98} $Sn is predicted to possess a long-lived $8^{+}$ state ranging from a few hundred ns to 5$\\mu$s\, decaying by an $E2$ transition of approximately 1 00 keV. The low production rate of $^{98}$Sn is compensated by the high is omeric ratio of the $8^{+}$ seniority isomers in the $^{100}$Sn region\, a nd a high survival probability through the spectrometer due to its long li fetime and significant internal conversion coefficient. Coupled to the hig h-efficiency HPGe array\, prospects for discovering new delayed $\\gamma$ rays in this nucleus are very high. Isospin symmetry will be tested via co mparisons of $E_x(J^{\\pi})$ and $B(E2)$ values with $^{98}$Cd.\n\nFinally \, the reduced $B_{GT}$ value of $^{100}$Sn in the latest EURICA experimen t\, owing to a $3\\sigma$ increase in the $\\beta$-decay endpoint energy ( $Q_{\\beta}$)\, was met with mixed reception in the follow-up mass spectro scopy and colinear laser spectroscopy experiments on the neighboring nucle i. The level scheme of $^{100}$In\, which affects the $Q_{\\beta}$ and $B_ {GT}$ values\, remains uncertain due to unobserved $\\gamma$-ray transitio ns relative to SM predictions. The efficiency of EURICA in the previous $^ {100}$Sn decay spectroscopy experiment was much reduced relative to its fu ll capacity. The new HPGe array is expected to be 3-4 times more efficient \, leading to an improvement in $\\gamma$-ray singles and $\\gamma$-$\\gam ma$ coincidence statistics by several factors and an order of magnitude\, respectively. The ambiguity surrounding the level scheme of $^{100}$In wil l be fully addressed by clear $\\gamma$-$\\gamma$ coincidence and anti-coi ncidence relationships.\n\nhttps://indico.ific.uv.es/event/7909/contributi ons/26413/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26413/ END:VEVENT BEGIN:VEVENT SUMMARY:Identification of heavy 2p emitters DTSTART;VALUE=DATE-TIME:20250327T111500Z DTEND;VALUE=DATE-TIME:20250327T113000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26407@indico.ific.uv.es DESCRIPTION:Speakers: Bertram Blank (CENBG)\nThe heaviest two-proton emitt er known today is 67Kr produced at the BigRIBS separator at the RIBF facil ity. In order to search for heavier 2p emitters\, a setup consisting of a segmented silicon detector array surrounded by germanium detectors is idea l allowing to not only search for 2p emitters\, but also to study at the s ame time nuclei in the vicinity of the 2p emitters.\nPossible new 2p emitt ers include 71Sr\, 75Zr\, 79Mo\, 83Ru\, 87Pd\, 91Cd\, and 95Sn.\nTo search for these heavier 2p emitters and to study their decay characteristics\, the best beams would be 92Mo for the first three\, and 112Sn for the follo wing four. A 124Xe might be considered for the last four 2p emitters.\nThe se opportunities will be presented at the workshop.\n\nhttps://indico.ific .uv.es/event/7909/contributions/26407/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26407/ END:VEVENT BEGIN:VEVENT SUMMARY:Exploring shape coexistence along the N=Z line DTSTART;VALUE=DATE-TIME:20250327T104500Z DTEND;VALUE=DATE-TIME:20250327T110000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26433@indico.ific.uv.es DESCRIPTION:Speakers: Jeongsu Ha (Center for Exotic Nuclear Studies\, Inst itute for Basic Science)\nCoherent motion of neutrons and protons in self- conjugate nuclei is a unique feature of nuclear many-body system. In the A =80 region\, an emergence of large collectivity of the N=Z nuclei indicate s large cross-shell excitation of protons and neutrons\, predicting shape coexistence [1]. Experimentally a salient deviation of the correlation bet ween B(E2\; 2_1+ -> 0_1+) and R_4/2 of N=Z nuclides also implies shape coe xistence [2]. However\, the second 0+ state has been identified up to 72Kr [3]. Here we aim to identify the second 0+ state in the next even-even se lf-conjugate nuclide 76Sr from the beta-gamma spectroscopy. Since an inver sion of ground-state shape from oblate to prolate is expected in 76Sr\, ob serving the second 0+ state will provide valuable information on shape com petition in this region. Moreover\, the observation will be a doorway to u nderstand the multiple shape coexistence predicted in 80Zr [4]. Regarding the experimental setup\, we focus on the production of 76Y and expect 0.08 cps at the F11 focal plane. A 5-day beamtime will sufficiently populate t he 1- state in 76Y\, and the second 0+ state in 76Sr following beta decay. \n\nhttps://indico.ific.uv.es/event/7909/contributions/26433/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26433/ END:VEVENT BEGIN:VEVENT SUMMARY:Investigation of the proton-neutron T=0 condensate using GT decay of the Tz=-1 $^{78}Zr$ and $^{82}Mo$ to the quasi-deuteron $1^+$ state in the N=Z $^{78}Y$ and $^{82}Nb$ Nuclei DTSTART;VALUE=DATE-TIME:20250327T103000Z DTEND;VALUE=DATE-TIME:20250327T104500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26426@indico.ific.uv.es DESCRIPTION:Speakers: Andres Gadea Raga (IFIC CSIC-University of Valencia )\nA.Gadea\, A.Algora\, A.I.Morales\, J.J. Valiente Dobon R.M. Perez Vidal \, R.Illicachi\, et al.\nIFIC\, CSIC-University of Valencia\, Spain\nA.Got tardo\, G.de Angelis\,et al.\nINFN Laboratori Nazionali di Legnaro\, Legna ro\, Italy\nA. Jungclaus\, P. Sarriguren\, et al.\nInstituto de Estructura de la Materia\, IEM-CSIC\, Madrid\, Spain\nP.Doornenbal\, et al. \nRIBF\, RIKEN\, Japan\nM.Górska\, et al. \nGSI-Darmstadt\, Germany \n\n\nand th e Ge array\, WAS3ABI\, RIBF\, and BigRIPS Collaborations\n\n\nThis proposa l aims to study the Gamow-Teller (GT) $\\beta$-decay of the the Tz=-1 $^{7 8}Zr$ and $^{82}Mo$ nuclei\, determining lifetime\, excitation energies an d B(GT) rates to the low lying $1^+$ states in $^{78}Y$ and $^{82}Nb$ resp ectively. The energy differences of the T=0 and T=1 ground states in this self-conjugate (N=Z) nuclei as well as the presence of T=0 proton-neutron (p-n) pairing condensate\, will be investigated through the GT -decay s trength of the Tz=-1 Jπ=0+ T=1 ground state into the Jπ=1+ T=0 in the od d-odd N=Z nucleus. The SU(4) symmetry\, responsible of the super-allowed GT decays in light systems\, is strongly suppressed in heavy ones due to the spin-orbit splitting. Proton-neutron pairs represent a generalization of the SU(4) symmetry\, therefore\, low-lying T=0 collective modes in odd- odd N=Z nuclei can elicit a super-allowed GT decay. Previous attempts to investigate this phenomenon in the decay of $^{62}Ge$ [1] and $^{70}Kr$ [2 ] have been inconclusive. Recent studies indicate that T=0 p-n pairing wil l be more relevant in N=Z nuclei with Z>~40 where p-n pairs are predicted to create a T=0 condensate [3]. In fact\, finding of delay alignments on t he level schemes of $^{84}Mo$ [4] and $^{88}Ru$ [5] have been suggested to originate by the onset of the T=0 pn pairing.\n The $^{82}Mo$ nucleus is possibly the heaviest Tz=-1 for which such investigation is feasible at RI BF with BigRIPS. The parent nuclei $^{82}Mo$ and $^{78}Zr$ parent nuclei w ill be populated in the fragmentation of a 140 pnA intensity $^{124}Xe$ be am at 345 MeV·A\, in a 740 mg/cm2 Be target\, with a cross section of 0. 6pbarn and 6pbarn respectively.\nThe separated fragmentation products will be implanted in the WAS3ABI Si array. The $^{78}Y$ and $^{82}Nb$ $\\beta $-delayed $\\gamma$-rays will be studied with the HPGe array.\n\n[1] E. Gr odner et al. Physical Review Letters 113 (2014): 092501.\n[2] A. Vitéz-S veiczer et al. Physics Letters B 830 (2022): 137123.\n[3] J. Jänecke\, et al. Phys. Lett. B 605 (2005) 87.\n[4] N. Mărginean et al. Physical Revi ew C 65.5 (2002): 051303.\n[5] B.Cederwall et al. Physical review letters 124.6 (2020): 062501.\n\nhttps://indico.ific.uv.es/event/7909/contributio ns/26426/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26426/ END:VEVENT BEGIN:VEVENT SUMMARY:Isospin Symmetry violation on ground states between mirror nuclei at A around 70 ~ 80 DTSTART;VALUE=DATE-TIME:20250327T110000Z DTEND;VALUE=DATE-TIME:20250327T111500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26420@indico.ific.uv.es DESCRIPTION:Speakers: Jiajian Liu (Institute of Modern Physics)\nThe conce pt of isospin was introduced by Heisenberg\, inspired by the striking simi larities between protons and neutrons in their behaviour under the strong interaction\, playing a pivotal role in advancing our understanding of par ticle and nuclear physics. However\, such symmetry is expected to be only approximate due to the mass difference between protons and neutrons\, the Coulomb interaction\, and the charge-dependent components of the nuclear f orce. The isospin symmetry breaking has been widely observed in low-lying excited states between mirror nuclei with the same mass number and exchang ed numbers of neutrons and protons. The stunning observation on the violat ion of the ground state in mirror system T = 3/2 of $^{73}$Kr / $^{73}$Br indicates the continuum effect coupled with states beyond the drip lines a nd nuclear deformation are crucial for understanding the structure of exot ic nuclei. Therefore\, this project is aiming at studying isospin symmetry breaking at proton-rich region around A ~ 70 to 80\, especially mirror sy stem of $^{76}$Y/$^{76}$Rb\, $^{81}$Mo/${^81}$Y and $^{85}$Ru/$^{85}$Nb\, at Radioactive Isotope Beam Factory (RIBF) in RIKEN\, using WASAbi array s urrounded by HPGe detectors.\n\nhttps://indico.ific.uv.es/event/7909/contr ibutions/26420/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26420/ END:VEVENT BEGIN:VEVENT SUMMARY:Exploring isospin symmetry breaking effects in the upper fp shell DTSTART;VALUE=DATE-TIME:20250327T090000Z DTEND;VALUE=DATE-TIME:20250327T091500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26439@indico.ific.uv.es DESCRIPTION:Speakers: Chaoyi FU (The University of Hong Kong)\nIsospin sym metry\, a fundamental symmetry in nuclear physics arising from the identic al behaviors of protons and neutrons. The symmetry violation is usually ex plained as isospin non-conserving (INC) forces and continuum effect. In ex periments\, plenty of efforts are made in mass and decay spectroscopy.\nHe nce\, to extend this study into the heavier nuclei for the upper $fp$ shel l\, we propose to measure the masses of $^{57}$Zn\, $^{61}$Ge\, $^{65}$Se\ , and $^{69}$Kr together with the $\\beta$-decay spectroscopy of $^{63}$Se simultaneously\, by employing the complex of the Multiple-Reflection Time -of-Flight Mass Spectrometer (MRTOF-MS) and EURICA decay station at the Ze roDegree. \nNew mass data could be utilized to study the effects of isospi n-nonconserving (INC) force in higher isospin multiples through determinin g the Coulomb displacement energy (CDE)\, in which a reduction of staggeri ng in CDE is anticipated in theory. \nDecay spectroscopy of $^{63}$Se is c ritical for studying the ground-state mirror asymmetry\, since the $T$$ = 5/2$ nuclei $^{63}$Se/$^{63}$Cu could be another promising candidate to ob serve the violation of the ground state in the mirror system\, of which th e ground state feeds to unbound $^{63}$As\, similar to $^{73}$Sr/$^{73}$Br .\n\nhttps://indico.ific.uv.es/event/7909/contributions/26439/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26439/ END:VEVENT BEGIN:VEVENT SUMMARY:Anomaly in the 2nd 2+ state of the self-conjugate 64Ge nucleus DTSTART;VALUE=DATE-TIME:20250327T091500Z DTEND;VALUE=DATE-TIME:20250327T093000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26418@indico.ific.uv.es DESCRIPTION:Speakers: Byul Moon (CENS\, IBS)\n$^{64}$Ge is a self-conjugat e nucleus with N = Z = 32\, located at just above the doubly magic nucleus \, $^{56}$Ni. This nucleus has a notable feature observed in the $2^{+}_{2 }$ state and its band structure [P. J. Ennis et al.\, NPA 535\, 392 (1991) ]. This band structure does not represent the $\\gamma$-band structure wit h $K = 2$ although the authors particularly focused on triaxial deformatio n. This structure has no odd-spin states and more intriguing feature is th e excitation energies of the $4^{+}$\, $6^{+}$\, and $8^{+}$ states. Those excited states lie on almost identical excitation energies of those state s belonging to the ground state\, which show degeneracy. However\, the ori gin of this anomalous structure has not yet been revealed.\n\nIn this pres entation\, we focus on the observation of the low-lying excited states to confirm this anomaly. We aim to measure the $3^{+}$ state and/or $0^{+}_{2 }$ state. The successful measurement of the $3^{+}$ state provides decisiv e information on the $\\gamma$-band structure. If this state is indeed mis sing\, the $2^{+}_{2}$ band structure has a unique feature. On the other h and\, the successful observation of the $0^{+}_{2}$ state locating below t he $2^{+}_{2}$ state may explain this structure in terms of shape coexiste nce. Finding neither of these states will drive the feature to the degener acy of first $4^{+}$\, $6^{+}$\, and $8^{+}$ states and advanced shell-mod el calculation needs to be developed.\n\nhttps://indico.ific.uv.es/event/7 909/contributions/26418/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26418/ END:VEVENT BEGIN:VEVENT SUMMARY:Waiting points and sandbanks along the rp-process path DTSTART;VALUE=DATE-TIME:20250327T093000Z DTEND;VALUE=DATE-TIME:20250327T094500Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26441@indico.ific.uv.es DESCRIPTION:Speakers: Kathrin Wimmer ()\nNucleosynthesis in the rapid prot on-capture process (rp-process) occurs in high-temperature\, proton-rich e nvironments\, where nuclei rapidly capture protons and\nundergo beta decay to form heavier elements. "Waiting points" emerge when proton captures be come energetically unfavorable\, temporarily halting nucleosynthesis until beta decay takes place.\nThese waiting points can be by-passed by sequent ial two-proton capture reactions through resonances. To understand the sig nificance of waiting points\, measurements of the Q-value as well as spin and parity assignments for resonances are crucial. For example\, while sev eral studies on the unbound 69Br related to the 68Se waiting point have be en conducted\, the results remain partially contradictory. For the next wa iting point at 72Kr\, such measurements have not yet been performed. We pr opose to investigate beta-delayed proton emissions from 69Br and 73Rb\, as well as the recently discovered "sandbank" nuclei 68Br and 72Rb. These st udies will provide new insights into the rp-process nucleosynthesis path a nd may revise our understanding of its endpoint\, potentially indicating t hat it terminates with lighter nuclei than previously expected if the bypa ssing of waiting points is significantly hindered.\n\nhttps://indico.ific. uv.es/event/7909/contributions/26441/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26441/ END:VEVENT BEGIN:VEVENT SUMMARY:Is the pseudo SU(4) symmetry valid to describe the beta decay of h eavy systems beyond A=70? DTSTART;VALUE=DATE-TIME:20250327T094500Z DTEND;VALUE=DATE-TIME:20250327T100000Z DTSTAMP;VALUE=DATE-TIME:20260716T235334Z UID:indico-contribution-7909-26423@indico.ific.uv.es DESCRIPTION:Speakers: Alejandro Algora (IFIC (CSIC-Univ. Valencia))\nIf pn pairing in the T=0 channel exists\, one would expect a very collective $0 ^+ \\rightarrow 1^+$ Gamow-Teller (GT) transition in the beta decay of a Z =N+2 nucleus into its N=Z counterpart [1]\, similar in strength to the sup er-allowed Fermi transition connecting the $0^+$ isobaric analog states. In a study performed at RIBF looking for these effects in the region aroun d $A \\sim 70$\, we have found an enhancement of the GT strength in the be ta decay of $^{70}$Kr into $^{70}$Br [2]. Even though the deduced strength does not represent a clear-cut indication of T=0 pn pairing in this case\ , a possible enhancement of T=0 pn pairing effects has been predicted in t he past when moving to systems heavier than mass A=70 [3]. \n\nClosely rel ated\, our study on the beta decay of $^{70}$Kr [2] showed clearly that ev en though the SU(4) symmetry is expected to be broken due to the increasin g role of the spin-orbit interaction in heavy nuclei\, the pseudo SU(4) sy mmetry is partially recovered for this system\, when compared with lighter Z=N+2 decays\, indicating also a change in the trend around A=70 [4]. \n\ nIn collaboration with the BigRIPS team [5]\, a feasibility assessment is presently being performed about the possibility to reach heavier Z=N+2 sys tems for study. The goal is to further test the validity of the pseudo SU( 4) symmetry for systems beyond A=70. Depending on the feasibility\, we pro pose to study the best reachable heavier Z=N+2 decay in order to clarify f urther this question. \n\n[1] A.L. Goodman\, Phys. Rev. C 60 (1999) 014311 \; S. Frauendorf\, A.O. Macchiavelli\, Prog. Part. Nucl. Phys. 78 (2014) 2 4\; F. Iachello\, Proc. Int. Conf. on Perspectives for the IBM\, Padova\, Italy\, 1994\, p.1.\; F. Iachello\, Yale University\, preprint YCTP-N13-88 .\; P. Halse\, B. R. Barrett\, Ann. Phys. (N. Y.) 192 (1989) 204.\n[2] A. Vitéz-Sveiczer et al.\, Phys. Lett. B\, 830 (2022) 396.\n[3] J. Jänecke\ , T. W. O’Donnell\, Phys. Lett. B 605 (2005) 87.\n[4] P. Van Isacker et al.\, Symmetry 15 (2023) 2001.\n[5] N. Fukuda\, private communication.\n\n https://indico.ific.uv.es/event/7909/contributions/26423/ LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario URL:https://indico.ific.uv.es/event/7909/contributions/26423/ END:VEVENT END:VCALENDAR