BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Gamow-Teller Resonances in the beta decay and Charge-Exchange Reac tions DTSTART;VALUE=DATE-TIME:20110221T144000Z DTEND;VALUE=DATE-TIME:20110221T152000Z DTSTAMP;VALUE=DATE-TIME:20260421T134720Z UID:indico-contribution-765-6164@indico.ific.uv.es DESCRIPTION:Speakers: Yoshitaka Fujita (Department of Physics\, Osaka Univ ersity)\nGamow-Teller (GT) transitions are caused by the most common weak interaction of spin-isospin (στ) type with ΔL = 0. Since spin and isos pin are unique quantum numbers in nuclei\, GT transitions represent very i mportant nuclear response. GT transitions are studied by the β decay and charge-exchange (CE) reactions. The β decay has a direct access to the ab solute GT transition strengths B(GT) from a study of half-lives\, Q-values and branching ratios\, but it can only access states at excitation energi es lower than the decay Q-value. In contrast\, the CE reactions\, e.g. (3H e\,t) reaction\, at intermediate beam energies and 0º\, can selectively e xcite GT states up to high excitation energies in the final nucleus. \n Although the study of GT strength in the β decay is restricted by the dec ay Q-value\, unstable nuclei can have the Q-value of 12 MeV or larger\, wh ich\, in principle allows the study of the central part of the GTR where t he GT strength is concentrated. Possibility of observing GTR structures in β-decay studies will be discussed on the basis of the GTR studies by (3H e\,t) reactions assuming a good isospin symmetry of nuclear structure and transitions.\n\nhttps://indico.ific.uv.es/event/349/contributions/6164/ LOCATION:Colegio Rector Peset URL:https://indico.ific.uv.es/event/349/contributions/6164/ END:VEVENT BEGIN:VEVENT SUMMARY:Superallowed Fermi decays: precise T1/2 and branching ratios measu rements DTSTART;VALUE=DATE-TIME:20110221T152000Z DTEND;VALUE=DATE-TIME:20110221T160000Z DTSTAMP;VALUE=DATE-TIME:20260421T134720Z UID:indico-contribution-765-6163@indico.ific.uv.es DESCRIPTION:Speakers: Jérôme Giovinazzo (CENBG / IN2P3 / CNRS)\nThrough the studies of Fermi transitions between 0+ analog states with T = 1 (su perallowed transitions)\, nuclear physics provides a valuable test of the Standard Model of particle physics. These transitions depend only on the v ector part of the weak interaction\, and according to the conserved vector current (CVC) hypothesis\, their strength Ft is a constant. Then this val ue is used to determine the Vud term in the CKM quark mixing matrix\, that should be unitary.\nThe constant Ft strength determination requires very high precision measurement of the decay energy QEC (related to masses) and of the partial half-life of the transition (parent nucleus half-life T1/2 and branching ratio BR)\, but it also requires some theoretical correctio ns of the experimental values. Then\, beside the search for “new physics ” if deviations from the standard model are observed\, such studies are a very sensitive test of the theoretical descriptions used to calculate th ose corrections.\nIn this presentation\, I will give a general view of the landscape of nuclei of interest for those studies\, with a focus on recen t experimental results concerning the T1/2 and BR measurements that we per formed at Jyväskylä university and ISOLDE at CERN : 26Si\, 30S\, 42Ti\, 38Ca and 62Ga. These results have to be compared with other measurements t hat have been performed worldwide\, showing the strong activity in this fi eld. Finally\, expectations and limitations for further studies will be ad dressed.\n\nhttps://indico.ific.uv.es/event/349/contributions/6163/ LOCATION:Colegio Rector Peset URL:https://indico.ific.uv.es/event/349/contributions/6163/ END:VEVENT BEGIN:VEVENT SUMMARY:Spectroscopy studies of N≈Z nuclei DTSTART;VALUE=DATE-TIME:20110221T140000Z DTEND;VALUE=DATE-TIME:20110221T144000Z DTSTAMP;VALUE=DATE-TIME:20260421T134720Z UID:indico-contribution-765-6161@indico.ific.uv.es DESCRIPTION:Speakers: J.J. Valiente Dobon (LNL-INFN)\nThe properties and s tructure of nuclei with equal number of protons and neutrons have been in the last decades an intense field of research\, both experimentally and t heoretically. The structure of these nuclei provide essential infomation\, among other things\, about the isospin symmetry of the nuclear force as w ell as on proton-neutron correlations. As an example\, the isobaric analog ue states in mirror nuclei have shed light on the presence of isospin non- conserving forces in nuclear matter. From the detailed studies of energy d ifferences between those states\, an important theoretical understanding o f the nuclear force in the f p shell [1]\, has been achieved\, recently ex tended to include the g9/2 [2\, 3]. Furthermore\, N = Z nuclei present enh anced correlations between neutrons and protons that occupy orbitals with the same quantum numbers. For heavier N = Z nuclei the T = 0 isoscalar cor relations become more relevant than the usual T = 1 isovector pairing\, gi ving rise to an unusual type of nuclear superfluidity [4].\n Spectrosc opy of excited states of these neutron-deficient nuclei has been demonstr ated to be a powerful tool to understand in detail the nature of the nucle ar force. This has been possible thanks to the advent\, in the last decade s\, of large γ -ray arrays with the associated complementary detectors th at allowed to access these very exotic N≈Z nuclei at high spins. Future studies of the exotic neutron-deficient nuclei will mainly require the us e of reactions induced by intense radioactive heavy-ion beams as those pro vided by near-future facilities and in the future by Eurisol. This will al low an unprecedented study of the heaviest N = Z nuclei located even furth er from the line of beta stability. In this presentation\, the isospin sym metry\nand the proton-neutron correlations will be discussed with special attention to the perspectives offered by the new radioactive-ion beam faci lities.\n 1. M.A. Bentley and S.M. Lenzi\, Prog. Part. and Nucl. Phys. 5 9\, 497 (2007).\n 2. R. Orlandi et al.\, Phys. Rev. Lett. 103\, 052501 ( 2009).\n 3. K. Kaneko et al.\, Phys. Rev. C 82\, 061301R (2010).\n 4. B. Cederwall et al.\, Nature 469 (2011).\n\nhttps://indico.ific.uv.es/even t/349/contributions/6161/ LOCATION:Colegio Rector Peset URL:https://indico.ific.uv.es/event/349/contributions/6161/ END:VEVENT END:VCALENDAR