Neutron-proton multiplets in the nucleus Br 88

M. Czerwiński, T. Rząca-Urban, W. Urban, P. Bączyk, K. Sieja, B. M. Nyakó, J. Timár, I. Kuti, T. G. Tornyi, L. Atanasova, A. Blanc, M. Jentschel, P. Mutti, U. Köster, T. Soldner, G. De France, G. S. Simpson, C. A. Ur

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Medium spin excited levels in Br88 populated in fission of U235 induced by neutrons have been observed for the first time. The measurement of γ radiation following fission has been performed using the EXILL array of Ge detectors at the cold-neutron beam facility PF1B of the Institut Laue-Langevin (ILL), Grenoble. The ground state of Br88 is proposed to be 1-, changing the adopted (2-) value. The low-energy, newly observed levels are members of the πp3/2ν(d5/2)3 and πf5/2-1ν(d5/2)3 multiplets. A triplet of yrast levels observed at around 2 MeV is interpreted as being due to coupling of the g9/2 proton to the (d5/2)3, seniority 3 multiplet, supporting the presence of collective effects in Br88. The position of the g9/2 proton intruder in the Ni78 core is determined at 5.7 MeV above the f5/2 proton level. Shell-model calculations predict the same proton-neutron excitations proposed in Br88.

Original languageEnglish
Article number014328
JournalPhysical Review C - Nuclear Physics
Issue number1
Publication statusPublished - Jul 30 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Czerwiński, M., Rząca-Urban, T., Urban, W., Bączyk, P., Sieja, K., Nyakó, B. M., Timár, J., Kuti, I., Tornyi, T. G., Atanasova, L., Blanc, A., Jentschel, M., Mutti, P., Köster, U., Soldner, T., De France, G., Simpson, G. S., & Ur, C. A. (2015). Neutron-proton multiplets in the nucleus Br 88. Physical Review C - Nuclear Physics, 92(1), [014328].