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Spectroscopic study of $$^{63}$$Ni via cold neutron capture reaction, 1; Nuclear structure of $$^{63}$$Ni

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

The $$gamma$$-radiation has been investigated produced by cold neutron capture in an enriched $$^{62}$$Ni sample. The 315 $$gamma$$-rays have been placed in the $$^{63}$$Ni level scheme of which 272 placements are new. We have determined excitation energies with 0.2-0.8 keV error and branching ratios of 62 bound levels in $$^{63}$$Ni, including 30 new levels. The Q-value of the $$^{62}$$Ni (n,$$gamma$$) $$^{63}$$Ni reaction amounts to 6837.75 (18) keV. A large-scale shell-model calculation has been performed and the energies of the low-lying $$^{63}$$Ni states are successfully reproduced. A mean-field statistical model calculation has been also made by using a self-consistent interaction between the Hartree-Fock + BCS method and the statistical calculation. The calculation result is consistent with the experimental level density of $$^{63}$$Ni.

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Category:Physics, Multidisciplinary

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