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Double deformed-shell closure at Z=100 and N=152; The First observation of excited states in $$^{252}$$Fm

陽子数100と中性子数152における二重変形閉殻; $$^{252}$$Fmの励起準位の初観測

浅井 雅人 ; 塚田 和明 ; 笠松 良崇*; 豊嶋 厚史; 佐藤 哲也  ; 金谷 佑亮; 永目 諭一郎; 佐藤 望; 石井 哲朗 

Asai, Masato; Tsukada, Kazuaki; Kasamatsu, Yoshitaka*; Toyoshima, Atsushi; Sato, Tetsuya; Kaneya, Yusuke; Nagame, Yuichiro; Sato, Nozomi; Ishii, Tetsuro

$$alpha$$-$$gamma$$同時計数測定及び高分解能$$alpha$$線微細構造測定により、9つのアクチノイド偶々核の第一励起2$$^{+}$$準位エネルギーを初めて精密に測定することに成功した。アクチノイド偶々核の第一励起2$$^{+}$$準位エネルギーが$$^{252}$$Fmにおいて極小値を取ることを初めて明らかにし、陽子数100、中性子数152が二重変形閉殻であることを示す結果を得た。

Energies of the first excited 2$$^{+}$$ states have been precisely measured for the first time for nine even-even actinide nuclei by means of $$alpha$$-$$gamma$$ coincidence measurement and high-resolution $$alpha$$ fine-structure measurement. It was found that the first excited 2$$^{+}$$ state energies in even-even actinide nuclei take the local minimum at $$^{252}$$Fm, which indicates the existence of the double deformed-shell closure at Z=100 and N=152.

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