Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+ state in 131Sb
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Date
2023
Authors
Bottoni, S
Gamba, E. R.
De Gregorio, G.
Gargano, A.
Leoni, S.
Fornal, B.
Brancadori, N.
Ciconali, G.
Crespi, F. C. L.
Cieplicka-Oryńczak, N.
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Nuclear Physics Polish Academy of Sciences
License Type
Creative commons license
Abstract
The lifetime of the 11/2+ 1 state in the 131Sb nucleus was measured at the LOHENGRIN spectrometer of the Institut Laue-Langevin via neutron-induced fission of 235U using γ -ray fast-timing techniques. The obtained value of T1/2 = 3 (2) ps, at the edge of the sensitivity of the experimental method, is the first result for the 11/2+1 state half-life in neutron-rich Sb isotopes. The corresponding quadrupole reduced transition probability to the ground state is B(E2) = 1.4+1.5−0.6W.u., indicating a noncollective nature of this state. Realistic shell-model calculations performed in a large valence space reproduce well the experimental value and point to a dominant 2+(130Sn) ⊗ πg7/2 configuration for the 11/2+1 state, as expected in a weak-coupling scenario. At the same time, the sum of the quadrupole strength of the multiplet states is predicted to exceed the one of the 130Sn core as a consequence of the equal contribution of the proton and the proton-neutron quadrupole matrix elements, pointing to possible development of collectivity already in the close neighborhood of 132Sn.
Description
Keywords
fizyka jądrowa, spektroskopia gamma, reakcja rozszczepienia, nuclear physics, gamma spectroscopy, fission reaction
Citation
S. Bottoni, E. R. Gamba, G. De Gregorio, A. Gargano, S. Leoni, B. Fornal, N. Brancadori, G. Ciconali, F. C. L. Crespi, N. Cieplicka-Orynczak, L. W. Iskra, G. Colombi, Y. H. Kim, U. Koster, C. Michelagnoli, F. Dunkel, A. Esmaylzadeh, L. Gerhard, J. Jolie, L. Knafla, M. Ley, J.- M. Regis, K. Schomaker, and M. Sferrazza, Phys. Rev. C 107, 014322 (2023).
Sponsorship:
Italian Istituto Nazionale di Fisica Nucleare, the Polish National Science Centre, Poland, under research project No. 2020/39/D/ST2/03510, the Polish National Agency for Academic Exchange (NAWA) within the Bekker programme under Grant PPN/BEK/2020/1/00431/U/00001, the Institute for Basic Science (IBS-R031-D1), the German DFG
under grant JO391/18-1, and the Fonds de la Recherche Scientifique - FNRS under Grants No. J.0174.22 and No. 4.45.10.08.
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Uznanie autorstwa 4.0 Międzynarodowe