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Alpha-decay spectroscopy of $$^{261}$$Rf

Asai, Masato ; Tsukada, Kazuaki ; Sato, Nozomi*; Sato, Tetsuya  ; Toyoshima, Atsushi; Ishii, Tetsuro ; Miyashita, Sunao*; Kaneya, Yusuke; Shima, Yosuke*; Shibata, Michihiro*

Alpha-gamma coincidence and high-resolution $$alpha$$ fine-structure measurements were performed for the $$alpha$$ decay of $$^{261}$$Rf. Two $$gamma$$ lines associated with the $$alpha$$ decay of $$^{261}$$Rf were clearly observed, and more precise $$alpha$$-energy spectrum than before were obtained. It was found that the literature value (8.28 MeV) of the $$alpha$$-transition energy of $$^{261}$$Rf was incorrect, and that the $$alpha$$-decay scheme of $$^{261}$$Rf should contain several low-energy cascade $$gamma$$ transitions. On the basis of these results and literature data of $$^{261m}$$Rf, we will discuss nuclear structure of superheavy nuclei around this region as well as the level structure of $$^{261}$$Rf and its daughter nucleus $$^{257}$$No.

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