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arXiv · 2012.03945

Detailed low-spin spectroscopy of 65Ni via neutron capture reaction

C. Porzio·C. Michelagnoli·N. Cieplicka-Orynczak·M. Sferrazza·S. Leoni·B. Fornal·Y. Tsunoda·T. Otsuka·S. Bottoni·C. Costache·F. C. L. Crespi·L. W. Iskra·M. Jentschel·F. Kandzia·Y. -H. Kim·U. Koester·N. Marginean·C. Mihai·P. Mutti·A. Turturica
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Abstract

An extended investigation of the low-spin structure of the $^{65}$Ni nucleus was performed at the Institut Laue-Langevin, Grenoble, via the neutron capture reaction $^{64}$Ni(n,$γ$)$^{65}$Ni, using the FIPPS HPGe array. The level scheme of $^{65}$Ni was significantly expanded, with 2 new levels and 87 newly found transitions. Angular correlation analyses were also performed, allowing us to assign spins and parities for a number of states, and to determine multipolarity mixing ratios for selected $γ$ transitions. The low-energy part of the experimental level scheme (up to about 1.4 MeV) was compared with Monte Carlo Shell Model calculations, which predict spherical shapes for all states, apart from the 9/2$^+$ and the second excited 1/2$^-$ states of oblate deformation.

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C. Porzio, C. Michelagnoli, N. Cieplicka-Orynczak, M. Sferrazza, S. Leoni, B. Fornal, Y. Tsunoda, T. Otsuka, S. Bottoni, C. Costache, F. C. L. Crespi, L. W. Iskra, M. Jentschel, F. Kandzia, Y. -H. Kim, U. Koester, N. Marginean, C. Mihai, P. Mutti, A. Turturica. 2020-12-07. Detailed low-spin spectroscopy of 65Ni via neutron capture reaction. https://doi.org/10.1103/physrevc.102.064310

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