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

$$^{261}$$Rfの$$alpha$$崩壊核分光の新たな実験結果

浅井 雅人  ; 塚田 和明  ; 佐藤 望*; 佐藤 哲也   ; 豊嶋 厚史; 石井 哲朗  ; 宮下 直*; 金谷 佑亮*; 柴田 理尋*; 嶋 洋佑*

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

$$^{261}$$Rfの$$alpha$$-$$gamma$$同時計数測定および高分解能$$alpha$$線微細構造測定実験を行い、$$^{261}$$Rfの核構造に関する新たな情報を取得した。$$alpha$$崩壊に伴い放出される2本の$$gamma$$線の存在を再確認するとともに、$$alpha$$遷移エネルギーを精度よく決定することに成功した。これらの実験結果から$$^{261}$$Rfの基底状態や核異性体準位のスピン・パリティ、中性子軌道配位を推定し、更に重い超重核の軌道配位や変形度の変化に関する情報を得た。

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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