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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

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

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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