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New additional experiments of $$alpha$$-decay spectroscopy for $$^{261}$$Rf

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

We have performed $$alpha$$-$$gamma$$ coincidence and high-resolution $$alpha$$-fine structure spectroscopy for $$^{261}$$Rf, and have obtained new information on nuclear structure of $$^{261}$$Rf. We have confirmed the existence of two $$gamma$$ transitions following the $$alpha$$ decay, and have succeeded in determining the $$alpha$$-transition energy very accurately. On the basis of these experimental results, we have estimated the spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

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