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$$^{234}$$Np核異性体の崩壊と核構造

Decay and nuclear structure of $$^{234}$$Np isomer

浅井 雅人 ; 末川 慶英*; 東 聖人*; 鎌田 裕生*; 戸部 晃久*; Andreyev, A. N.; 廣瀬 健太郎 ; 伊藤 由太 ; 牧井 宏之  ; 西尾 勝久  ; 庭瀬 暁隆*; Orlandi, R. ; 阪間 稔*; 佐藤 哲也  ; 柴田 理尋*; 洲嵜 ふみ ; 鈴木 颯人*; 床井 健運*; 富塚 知博; 塚田 和明 

Asai, Masato; Suekawa, Yoshihide*; Higashi, Masato*; Kamada, Hiroki*; Tobe, Teruhisa*; Andreyev, A. N.; Hirose, Kentaro; Ito, Yuta; Makii, Hiroyuki; Nishio, Katsuhisa; Niwase, Toshitaka*; Orlandi, R.; Sakama, Minoru*; Sato, Tetsuya; Shibata, Michihiro*; Suzaki, Fumi; Suzuki, Hayato*; Tokoi, Katsuyuki*; Tomitsuka, Tomohiro; Tsukada, Kazuaki

最近我々が発見した新核異性体$$^{234m}$$Npの核構造を明らかにするための実験を実施した。$$^{234m}$$Npは、原子力機構タンデム加速器を用いて$$^{6}$$Liビームを$$^{233}$$U標的に照射して合成し、オンライン同位体分離装置(ISOL)を用いて質量分離した。LX線の測定から半減期を精度良く決定し、LX-$$gamma$$同時計数測定により核異性体転移の後に放出される$$gamma$$線の観測に成功した。また内部転換電子測定も実施し、$$gamma$$遷移の多重極度を決定した。これらの実験結果を基に、$$^{234m}$$Npの励起エネルギー,スピン・パリティ,核構造を明らかにした。

We have carried out experiments to study nuclear structure of the new isomer $$^{234m}$$Np which we discovered recently. The $$^{234m}$$Np was produced in the reaction of $$^{233}$$U target with $$^{6}$$Li beam at JAEA tandem accelerator, and was mass-separated with an on-line isotope separator (ISOL). The half-life was determined accurately through LX-ray measurements. The $$gamma$$ transition emitted by following the isomeric transition was successfully observed through LX-$$gamma$$ coincidence measurements. Moreover, the multipolarities of the $$gamma$$ transitions were determined with internal-conversion electron measurements. On the basis of these experimental results, We have clarified excitation energy, spin-parity, and nuclear structure of $$^{234m}$$Np.

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