BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Beta Decay Spectra Measurements for the Study of Reactors’ Antin eutrino Spectra. DTSTART;VALUE=DATE-TIME:20240530T133000Z DTEND;VALUE=DATE-TIME:20240530T135000Z DTSTAMP;VALUE=DATE-TIME:20261014T202225Z UID:indico-contribution-4073-23817@indico.ific.uv.es DESCRIPTION:Speakers: G. A. Alcalá (Instituto de Física Corpuscular (IFI C)\, València\, Spain.)\nRecent predictions of reactors $\\bar{\\nu}$ spe ctra have revealed two irregularities: the Reactor Antineutrino Anomaly (R AA) and the spectral "bump" [1\,2\,3]. These predictions\, calculated with the Huber-Muller Conversion model [4\,5]\, have provoked several doubts a bout the integrity of experimental data and the accuracy of the models use d. In view of this\, improved measurements of nuclear data of relevant iso topes\, and the use of the Summation Calculation method [6] to determine r eactors $\\bar{\\nu}$ spectra\, present an alternative to the Conversion m odel. Calculations of reactors $\\bar{\\nu}$ spectra employing $\\beta$ fe edings from standard databases may suffer from the Pandemonium Effect\, wh ich can be mitigated by using the Total Absorption Gamma Spectroscopy (TAG S) technique [7].\n\nThe decays of a relatively small number of neutron ri ch fission products contribute the most to reactors $\\bar{\\nu}$ spectra within the regions where the effects of the RAA and the "bump" are stronge r [8]. Therefore\, to directly determine reliable energy distributions (or shapes) of these $\\beta$ decay spectra\, experimental campaigns have bee n performed at the IGISOL facility (Jyväskylä\, Finland) with newly deve loped telescope detectors. Several $\\beta$ decay spectra of utmost releva nce for the study of the RAA and the "bump" have been measured in the I233 (2022) and I233add (2023) experiments.\n\nThis presentation is dedicated to introduce the problem of the RAA and the "bump"\, and how the calculati ons of reactors $\\bar{\\nu}$ spectra are improved with the use of the Sum mation method and TAGS $\\beta$ feedings. Preliminary results of the analy sis of the data of the I233 experiment will be shown.\n\n[1] G. Mention et al.\, Physical Review D 83\, 073006 (2011).\n[2] J. H. Choi\, et al.\, Ph ysical Review Letters 116\, 211801. (2016).\n[3] F. P. An et al.\, Chinese Physics C 41\, 013002. (2017).\n[4] P. Huber\, Physical Review C 84\, 246 17 (2011)\; Physical Review C 85\, 029901 (2012).\n[5] T. A. Muller et al. \, Physical Review C - Nuclear Physics 83\, 054615 (2011).\n[6] M. Estienn e et al.\, Physical Review Letters 123\, 022502 (2019).\n[7] A. Algora et al.\, European Physical Journal A 57\, 85 (2021).\n[8] L. Hayen et al.\, P hysical Review C 100\, 054323 (2019).\n\nWe acknowledge the support from t he following projects: Prometeo Grant (CIPROM/2022/9)\, ASFAE Project (ASF AE/2022/027) and PID2022-138297NB-C21.\n\nhttps://indico.ific.uv.es/event/ 7332/contributions/23817/ LOCATION:ADEIT - Valencia URL:https://indico.ific.uv.es/event/7332/contributions/23817/ END:VEVENT BEGIN:VEVENT SUMMARY:γ-spectroscopy combining isotopically identified fragments and hi gh fold γ-rays in Nb isotopes - first observation of 1 and 2 phonon γ-vi brational bands in odd-odd nucleus DTSTART;VALUE=DATE-TIME:20240530T130000Z DTEND;VALUE=DATE-TIME:20240530T133000Z DTSTAMP;VALUE=DATE-TIME:20261014T202225Z UID:indico-contribution-4073-23797@indico.ific.uv.es DESCRIPTION:Speakers: Enhong Wang (Shandong University)\nThe nuclear struc ture of neutron-rich nuclei around A ∼ 100 shows shape transitions and l arge deformations. Among others\, these include ellipsoidal oscillation o f the shape (γ-vibrations). One-phonon γ-bands are observed in numerous deformed nuclei\, however\, observations of two or higher-order phonon γ -bands are rare. While the even-Z nuclei have been well investigated\, the spectroscopy of odd-odd nuclei in this region can provide deeper insights into our understanding. As part of a study of the evolution of the struct ure of even-odd and odd-odd neutron-rich Nb isotopes\, the structure of 10 4Nb was investigated in detail. The Nb nuclei were populated in fission re actions and measured using gamma-ray spectroscopy in two complementary way s using a) isotopically identified fragment produced in beam fusion and tr ansfer induced fission in the 238U+9Be system using the VAMOS++ and the AG ATA spectrometer and b) high statistics γ-γ-γ and γ-γ-γ-γ fold data from the spontaneous fission of 252Cf using GAMMASPHERE. The talk will di scuss the complementarity of the two methods necessary for studying neutro n-rich nuclei at high spin\, especially for odd-odd nuclei. The data are t hen systematically compared with neighboring multi-phonon γ-vibrational b ands to address the interesting observation for the first time of multi-ph onon vibrational bands in 104Nb.\n\nhttps://indico.ific.uv.es/event/7332/c ontributions/23797/ LOCATION:ADEIT - Valencia URL:https://indico.ific.uv.es/event/7332/contributions/23797/ END:VEVENT BEGIN:VEVENT SUMMARY:TAGS measurements at GANIL with STARS DTSTART;VALUE=DATE-TIME:20240530T135000Z DTEND;VALUE=DATE-TIME:20240530T141000Z DTSTAMP;VALUE=DATE-TIME:20261014T202225Z UID:indico-contribution-4073-23799@indico.ific.uv.es DESCRIPTION:Speakers: Sonja Orrigo (IFIC (CSIC-UV))\nConventional high-res olution techniques for $\\beta$-decay spectroscopy utilize high-purity ger manium detectors to measure individual $\\gamma$ rays emitted after $\\bet a$ decay. However\, this kind of measurement is affected by the Pandemoniu m systematic error [1]\, resulting in many high-energy $\\gamma$ rays and a significant portion of the $\\beta$ strength being missed. The Total Abs orption $\\gamma$-ray Spectroscopy (TAGS) technique effectively addresses this issue [2\, 3]. This method relies on the detection of the full energy of $\\gamma$ cascades following the decay\, achieved through the use of l arge scintillation crystals with high efficiency that act like calorimeter s. The TAGS technique allows for a precise determination of the $\\beta$ s trength free of Pandemonium. This is a fundamental quantity that depends o n the underlying nuclear structure\, making it the ideal tool for providin g constraints on theoretical models. The technique has been successfully u tilized for many years\, yielding important results relevant to nuclear st ructure\, nuclear astrophysics\, and applications in reactor and neutrino physics (see Ref. [3] for a recent review).\n\nCurrently\, a new-concept h ybrid spectrometer\, STARS\, is under development within the framework of the (NA)$^{2}$STARS project [4]. STARS will be the first device in the wor ld to combine the large $\\gamma$ efficiency typical of TAGS calorimeters with the excellent energy resolution and timing of LaBr$_{3}$(Ce) crystals . This unique combination\, along with increased segmentation\, will enabl e unprecedented studies further away from nuclear stability\, covering a b road range of physics cases and with prospects for use at many internation al facilities. In particular\, our first proposal has already been approve d at GANIL: Experiment E891_23 [5]\, which will be the pioneering measurem ent performed with STARS. The goal of E891_23 is to measure the $\\beta$-d ecay properties of several proton-rich nuclei in the Cr-Zn region\, of gre at interest for nuclear structure (to study isospin symmetry free of Pande monium in selected Tz=-2 nuclei [6\, 7]) and nuclear astrophysics (to cons train reaction rates of interest for the $^{44}$Ti nucleosynthesis).\n\n[1 ] J.C. Hardy et al.\, Phys. Lett. B 71\, 307 (1977).\n\n[2] B. Rubio et al .\, J. Phys. G Nucl. Part. Phys. 31\, S1477 (2005).\n\n[3] A. Algora et al .\, Eur. Phys. J. A 57\, 85 (2021).\n\n[4] Project (NA)$^{2}$STARS: “Neu trinos\, Applications and Nuclear Astrophysics with a Segmented Total Abso rption with a higher Resolution Spectrometer” (spokesperson: M. Fallot)\ , endorsed by the GANIL Scientific Council\, Jan. 2023.\n\n[5] Experiment E891_23: “Total Absorption Spectroscopy for Nuclear Structure and Nuclea r Astrophysics” (spokespersons: M. Fallot\, S.E.A. Orrigo\, A.M. Sánche z Benítez)\, approved by the GANIL Program Advisory Committee\, Nov. 2023 .\n\n[6] S.E.A. Orrigo et al.\, Phys. Rev. Lett. 112\, 222501 (2014). \n\n [7] S.E.A. Orrigo et al.\, Phys. Rev. C 93\, 044336 (2016).\n\nhttps://ind ico.ific.uv.es/event/7332/contributions/23799/ LOCATION:ADEIT - Valencia URL:https://indico.ific.uv.es/event/7332/contributions/23799/ END:VEVENT BEGIN:VEVENT SUMMARY:Core-breaking effects approaching $^{100}$Sn: lifetime measurement s in $^{98\,100}$Cd DTSTART;VALUE=DATE-TIME:20240530T143000Z DTEND;VALUE=DATE-TIME:20240530T145000Z DTSTAMP;VALUE=DATE-TIME:20261014T202225Z UID:indico-contribution-4073-23069@indico.ific.uv.es DESCRIPTION:Speakers: Marta Polettini (University and INFN Padova)\nThe nu clear structure of doubly magic nuclei such as $^{100}$Sn and its neighbor ing isotopes is of significant interest due to the valuable insights it of fers for testing the nuclear shell model. However\, describing the nearby Cd isotopic chain poses additional challenges due to the enhanced correlat ions induced by two proton holes in the g9/2 orbit. In particular\, $^{98} $Cd (Z=48\, N=50) stands out as the most proton-rich N=50 isotone for whic h information about excited states is available\, while data on lifetimes remain scarce.\n\nAn experimental study with the aim of measuring the life times of low-lying excited states below the 8$^+$ seniority isomer in the neutron-deficient $^{98\,100}$Cd isotopes was performed at GSI-FAIR as par t of the FAIR Phase-0 program. Ions of interest were populated via a relat ivistic fragmentation reaction induced by an 839~MeV $^{124}$Xe beam. The nuclei were then selected and identified using the FRagment Separator (FRS ) and subsequently implanted in the DEcay SPECtroscopy (DESPEC) station. T he lifetime measurements were conducted using the FATIMA LaBr$_3$(Ce) arra y employing the Generalised Centroid Difference (GCD) method.\n\nThe obtai ned results will be discussed and compared with shell model calculations\, employing various model spaces and interactions. These comparisons reveal that while $^{98}$Cd is consistent with a seniority scheme description\, configuration mixing plays a crucial role in describing the measured B(E2) values in $^{100}$Cd\, with significant contributions from both proton an d neutron core excitations.\n\nhttps://indico.ific.uv.es/event/7332/contri butions/23069/ LOCATION:ADEIT - Valencia URL:https://indico.ific.uv.es/event/7332/contributions/23069/ END:VEVENT BEGIN:VEVENT SUMMARY:New isomers in 213Tl and 215Tl revealing shell evolution beyond N = 126 shell closure DTSTART;VALUE=DATE-TIME:20240530T141000Z DTEND;VALUE=DATE-TIME:20240530T143000Z DTSTAMP;VALUE=DATE-TIME:20261014T202225Z UID:indico-contribution-4073-23080@indico.ific.uv.es DESCRIPTION:Speakers: Tik Tsun Yeung (The University of Tokyo)\nExperiment al data of isomerism in the neutron-rich N ≥ 126 region are important to test the predictability of shell evolution beyond the N = 126 shell closu re by shell-model calculations. Moreover\, the predicted properties of mor e exotic isotopes could affect the abundance of actinides in r-process cal culations [1]. However\, these information are scarcely available as it is challenging to access this region by current facilities. \n\nWe will pres ent new isomeric transitions in the BRIKEN experiment [2] at RIBF\, RIKEN Nishina Center. Particle identification of isotopes with mass ranging 200 ≲ A ≲ 220 was confirmed by the BigRIPS separator and the novel silicon dE telescope. For the first time at RIBF\, decays of nuclei southeast of 208Pb were measured by the BRIKEN array [3]. New isomers in 213Tl and 215T l [4] were observed by correlation among implantation\, Meitner-Ellis elec tron [5] and γ events using WAS3ABi active stopper [6] and high-purity ge rmanium (HPGe) clover detector. Our proposed isomeric level schemes [4] ar e compared to the shell-model calculations [7] to explain shell evolution. Plans to further investigate isomeric transitions and β decays in the sa me region will be introduced. \n\nReferences \n[1] E. Holmbeck et al.\, As trophys. J. 870(1)\, 23 (2019).\n[2] J. Wu et al.\, RIBF NP-PAC Proposal N P1712-RIBF158 (2017).\n[3] A. Tolosa-Delgado et al.\, Nucl. Instrum. Metho ds. Phys. Res. A 925-133 (2019).\n[4] T. T. Yeung\, A. I. Morales\, J. Wu\ , M. Liu\, C. Yuan et al.\, First Exploration of Monopole-Driven Shell Evo lution above the N = 126 shell closure: new Millisecond Isomers in 213Tl a nd 215Tl\, arXiv:2401.06428 (2024). https://arxiv.org/abs/2401.06428 \n[5] H. E. Mahnke\, Notes Rec. 76(1)\, 107-116 (2022).\n[6] S. Nishimura\, Pro g. Theor. Exp. Phys. 2012(1)\, 03C006 (2012).\n[7] C. Yuan et al.\, Phys. Rev. C 106(4)\, 044314 (2022).\n\nhttps://indico.ific.uv.es/event/7332/con tributions/23080/ LOCATION:ADEIT - Valencia URL:https://indico.ific.uv.es/event/7332/contributions/23080/ END:VEVENT END:VCALENDAR