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Article Dans Une Revue Physical Review C Année : 2021

Medium-spin states of the neutron-rich nucleus $^{87}$Br

B. M Nyakó
J. Timár
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M. Csatlós
D. Sohler
T. G Tornyi
T. Rząca-Urban
W. Urban
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P. Bączyk
L. Atanasova
D. L Balabanski
K. Sieja
A. Blanc
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P. Mutti
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C. A Ur

Résumé

Medium-spin excited states of the neutron-rich nucleus 87 Br were observed and studied for the first time. They were populated in fission of 235 U induced by the cold-neutron beam of the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of γ radiation following fission was performed using the EXILL array of Ge detectors. The observed level scheme was compared with results of large valence space shell model calculations. The medium-spin level scheme consists of three bandlike structures, which can be understood as bands built on the π f 5/2 , π (p 3/2 + f 5/2), and π g 9/2 configurations. The behavior of the observed π g 9/2 band at high spins shows a considerable deviation from the shell model predictions. This deviation in this band is probably the result of an increased collectivity, which can be understood assuming that the π g 9/2 highj proton polarizes the core.
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Dates et versions

hal-03455019 , version 1 (29-11-2021)

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Citer

B. M Nyakó, J. Timár, M. Csatlós, Zs. Dombrádi, A. Krasznahorkay, et al.. Medium-spin states of the neutron-rich nucleus $^{87}$Br. Physical Review C, 2021, 103 (3), pp.034304. ⟨10.1103/physrevc.103.034304⟩. ⟨hal-03455019⟩
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