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Excitation functions for production of Rf isotopes in the $$^{248}$$Cm + $$^{18}$$O reaction

$$^{248}$$Cm+$$^{18}$$O反応におけるRf同位体生成反応の励起関数測定

村上 昌史*; 後藤 真一*; 村山 裕史*; 小嶋 貴幸*; 工藤 久昭*; 加治 大哉*; 森本 幸司*; 羽場 宏光*; 工藤 祐生*; 住田 貴之*; 酒井 隆太郎*; 米田 晃*; 森田 浩介*; 笠松 良崇*; 菊永 英寿*; 佐藤 哲也

Murakami, Masashi*; Goto, Shinichi*; Murayama, Hirofumi*; Kojima, Takayuki*; Kudo, Hisaaki*; Kaji, Daiya*; Morimoto, Koji*; Haba, Hiromitsu*; Kudo, Yuki*; Sumita, Takayuki*; Sakai, Ryutaro*; Yoneda, Akira*; Morita, Kosuke*; Kasamatsu, Yoshitaka*; Kikunaga, Hidetoshi*; Sato, Tetsuya

$$^{248}$$Cm+$$^{18}$$O反応で生成するラザホージウム同位体$$^{260}$$Rf, $$^{261a}$$Rfおよび$$^{262}$$Rfの励起関数を、エネルギー88.2-101.3MeVの範囲で気体充填反跳分離装置を用いて測定した。特に数秒の半減期をもつ自発核分裂成分の励起関数に注目した。これまで、この生成反応に伴う自発核分裂は$$^{261b}$$Rfおよび$$^{262}$$Rfの核異性体の崩壊によるものと考えられてきたが、励起関数の比較により、$$^{261b}$$Rfの崩壊にのみ関連する事象であることを明らかにし、その崩壊様式を決定した。

Production cross sections of Rf isotopes in the $$^{248}$$Cm + $$^{18}$$O reaction were measured at the beam energy range of 88.2 to 101.3 MeV by use of a gas-filled recoil ion separator. The excitation functions of $$^{260}$$Rf, $$^{261a}$$Rf, and $$^{262}$$Rf were obtained together with those of spontaneously fissioning nuclides which have few-second half-lives and have been assigned to $$^{261b}$$Rf and a longer-lived state of $$^{262}$$Rf. The excitation function of few-second spontaneously fissioning nuclide exhibited the maximum cross section at the $$^{18}$$O beam energy of 94.8 MeV. The shape of the excitation function was almost the same as that of $$^{261a}$$Rf, whereas it was quite different from those of $$^{260}$$Rf and $$^{262}$$Rf. A few-second spontaneously fissioning nuclide previously reported as $$^{261b}$$Rf and $$^{262}$$Rf observed in$$^{248}$$Cm + $$^{18}$$O reaction was identified as $$^{261b}$$Rf.

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パーセンタイル:38.03

分野:Physics, Nuclear

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