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

冷中性子捕獲反応による$$^{63}$$Niの核分光研究,1; $$^{63}$$Niの核構造

大島 真澄; 金 政浩*; 中村 詔司; 本間 道雄*; 湊 太志; 早川 岳人; 原 かおる; 木村 敦; 小泉 光生; 原田 秀郎 ; 後藤 淳*; 村上 幸弘*

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

濃縮$$^{62}$$Ni試料の冷中性子捕獲により生成された$$gamma$$線を核分光法で調べた。272本の新しい$$gamma$$線を含む315本の$$gamma$$線が$$^{63}$$Niの準位構造に組み込まれた。30本の新準位を含む62本の準位に対して、0.2-0.8keVの精度の励起エネルギーと$$gamma$$線分岐比を決定した。$$^{62}$$Ni (n,$$gamma$$) $$^{63}$$Ni反応のQ値は6837.75(18)keVであった。大規模殻模型計算を行った結果、$$^{63}$$Niの低励起状態のエネルギーがよく再現できた。Hartree-Fock + BCS法と統計計算の間の自己無撞着相互作用を用いた平均場統計模型計算も行い、$$^{63}$$Niの準位密度の実験値と矛盾しないことを示した。

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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