Spectroscopic study of 63Ni via cold neutron capture reaction: I. Nuclear structure of 63Ni

Masumi Oshima, Tadahiro Kin, Shoji Nakamura, Michio Honma, Futoshi Minato, Takehito Hayakawa, Kaoru Y. Hara, Atsushi Kimura, Mitsuo Koizumi, Hideo Harada, Jun Goto, Yukihiro Murakami

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Abstract

The γ-radiation has been investigated for 63Ni produced by cold neutron capture in an enriched 62Ni sample. The 315 γ-rays produced were placed in a 63Ni level scheme, in which 272 placements are new. We determined the excitation energies with 0.2-0.8 keV error and the branching ratios of 62 bound levels in 63Ni, including 30 new levels. The Q-value of the 62Ni(n, γ) 63Ni reaction amounts to 6837.75 ± 0.18 keV. A large-scale shell-model calculation was performed that included the four single-particle orbits of 0f 7/2, 1p 3/2, 0f 5/2, and 1p 1/2, assuming an inert 40Ca core for negative-parity states, and those of 1 p3/2, 0f 5/2, 1p 1/2, and 0g 9/2, assuming a 56Ni core for positive-parity states. The energies of the low-lying 63Ni states were successfully reproduced. A mean-field statistical-model calculation was also performed by using a self-consistent interaction between the Hartree-Fock + Bardeen-Cooper-Schrieffer method and the statistical calculation. The calculation result is consistent with the experimental level density of 63Ni.

Original languageEnglish
Article number084201
JournalJournal of the Physical Society of Japan
Volume81
Issue number8
DOIs
Publication statusPublished - Aug 1 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Oshima, M., Kin, T., Nakamura, S., Honma, M., Minato, F., Hayakawa, T., Hara, K. Y., Kimura, A., Koizumi, M., Harada, H., Goto, J., & Murakami, Y. (2012). Spectroscopic study of 63Ni via cold neutron capture reaction: I. Nuclear structure of 63Ni. Journal of the Physical Society of Japan, 81(8), [084201]. https://doi.org/10.1143/JPSJ.81.084201