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Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+state in 131Sb

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Title
Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+state in 131Sb
Author(s)
Bottoni, S.; Gamba, E. R.; De Gregorio, G.; Gargano, A.; Leoni, S.; Fornal, B.; Brancadori, N.; Ciconali, G.; Crespi, F. C. L.; Cieplicka-Orynczak, N.; Iskra, L. W.; Colombi, G.; Yung Hee Kim; Koester, U.; Michelagnoli, C.; Dunkel, F.; Esmaylzadeh, A.; Gerhard, L.; Jolie, J.; Knafla, L.; Ley, M.; Regis, J. -M.; Schomaker, K.; Sferrazza, M.
Publication Date
2023-01
Journal
PHYSICAL REVIEW C, v.107, no.1
Publisher
AMER PHYSICAL SOC
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 gamma-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) circle times pi g7/2 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.
URI
https://pr.ibs.re.kr/handle/8788114/14623
DOI
10.1103/PhysRevC.107.014322
ISSN
2469-9985
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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