Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2⁺ state in ¹³¹Sb [Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+ state in Sb131]
Articolo
Data di Pubblicazione:
2023
Citazione:
Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2⁺ state in ¹³¹Sb [Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+ state in Sb131] / S. Bottoni, E.R. Gamba, G. De Gregorio, A. Gargano, S. Leoni, B. Fornal, N. Brancadori, G. Ciconali, F.C.L. Crespi, N. Cieplicka-Oryńczak, Ł.W. Iskra, G. Colombi, Y.H. Kim, U. Köster, C. Michelagnoli, F. Dunkel, A. Esmaylzadeh, L. Gerhard, J. Jolie, L. Knafla, M. Ley, J.-. Régis, K. Schomaker, M. Sferrazza. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 107:1(2023 Jan 26), pp. 014322.014322-1-014322.014322-6. [10.1103/PhysRevC.107.014322]
Abstract:
The lifetime of the 11/21+ state in the Sb131 nucleus was measured at the LOHENGRIN spectrometer of the Institut Laue-Langevin via neutron-induced fission of U235 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 11/21+ state half-life in neutron-rich Sb isotopes. The corresponding quadrupole reduced transition probability to the ground state is B(E2)=1.4-0.6+1.5W.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+(Sn130) - πg7/2 configuration for the 11/21+ 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 Sn130 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 Sn132.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
S. Bottoni, E.R. Gamba, G. De Gregorio, A. Gargano, S. Leoni, B. Fornal, N. Brancadori, G. Ciconali, F.C.L. Crespi, N. Cieplicka-Oryńczak, Ł.W. Iskra, G. Colombi, Y.H. Kim, U. Köster, C. Michelagnoli, F. Dunkel, A. Esmaylzadeh, L. Gerhard, J. Jolie, L. Knafla, M. Ley, J.-. Régis, K. Schomaker, M. Sferrazza
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