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$$gamma$$-ray spectroscopy for neutron-rich A$$approx$$160-170 nuclei; The $$beta^{-}$$ decay of $$^{159}$$Pm, $$^{160-162}$$Sm, $$^{162}$$Eu, $$^{164-166}$$Gd, and $$^{166-168}$$Tb

質量数160-170領域の中性子過剰核の$$gamma$$線核分光; $$^{159}$$Pm,$$^{160-162}$$Sm,$$^{162}$$Eu,$$^{164-166}$$Gd, $$^{166-168}$$Tbの$$beta^{-}$$崩壊

浅井 雅人 ; 市川 進一; 塚田 和明 ; 長 明彦 ; 西中 一朗; 永目 諭一郎; 小島 康明*; 柴田 理尋*

Asai, Masato; Ichikawa, Shinichi; Tsukada, Kazuaki; Osa, Akihiko; Nishinaka, Ichiro; Nagame, Yuichiro; Kojima, Yasuaki*; Shibata, Michihiro*

陽子誘起核分裂で生成する質量数160-170領域の中性子過剰核をオンライン同位体分離装置を用いて質量分離し、$$beta$$崩壊$$gamma$$線核分光の手法により核構造を研究した。$$^{159}$$Pm,$$^{161,162}$$Sm,$$^{165,166}$$Gdの観測に初めて成功し半減期を決定するとともに、娘核のエネルギー準位を明らかにした。また$$^{162}$$Eu,$$^{164}$$Gdの崩壊$$gamma$$線の測定にも成功し、その結果から$$^{162}$$Euの基底状態のスピンが5あるいは6であると推定された。

Structure of neutron-rich A$$approx$$160-170 nuclei produced in the proton-induced fission has been studied through $$gamma$$-ray spectroscopy using an on-line isotope separator. $$beta^{-}$$ decays of $$^{159}$$Pm, $$^{161,162}$$Sm, and $$^{165,166}$$Gd have been observed for the first time, and their half-lives were determined. Excited states of their daughter nuclei were revealed. $$gamma$$ rays following the $$beta^{-}$$ decay of $$^{162}$$Eu and $$^{164}$$Gd have been also observed. The results suggest that the ground state of $$^{162}$$Eu would have a spin 5 or 6.

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