Neutron-proton multiplets in the odd-odd nucleus Rb53 3790

M. Czerwiński, T. Rzaoca-Urban, W. Urban, P. Baoczyk, K. Sieja, J. Tímár, B. Nyakó, 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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Abstract

Medium-spin excited levels in Rb90, populated in the fission of U235 induced by neutrons, have been observed for the first time. γ radiation from fission has been measured by using the EXILL array of Ge detectors at the cold-neutron-beam facility PF1B of the Institut Laue-Langevin, Grenoble. Low-energy levels are interpreted as members of the πp3/2-1ν(d5/2)3, πf5/2-1ν(d5/2)3, and πg9/2ν(d5/2)3 multiplets with the 0- ground state due to the seniority-3 coupling in the νd5/2 shell. Analogous anomalous coupling within the πg9/2ν(d5/2)3 configuration explains the 5+, 6+, and 7+ triplet of states, observed at medium spins, similar to the triplet seen in the N=53 isotone, Br88. Shell-model calculations reproduce well the proposed structures in Rb88,90 and support the seniority-3 coupling in N=53 isotones and its absence in N=51 isotones. The structure of the odd-odd Rb88 and Rb90 nuclei provides an argument in favor of the collectivity building up at the neutron number N=53.

Original languageEnglish
Article number034318
JournalPhysical Review C - Nuclear Physics
Volume93
Issue number3
DOIs
Publication statusPublished - márc. 16 2016

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Czerwiński, M., Rzaoca-Urban, T., Urban, W., Baoczyk, P., Sieja, K., Tímár, J., Nyakó, B., 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. (2016). Neutron-proton multiplets in the odd-odd nucleus Rb53 3790. Physical Review C - Nuclear Physics, 93(3), [034318]. https://doi.org/10.1103/PhysRevC.93.034318