Tilted-foil technique for producing a spin-polarized radioactive isotope beam

傾斜薄膜を用いた偏極不安定核ビーム生成法

平山 賀一*; 三原 基嗣*; 渡辺 裕*; Jeong, S. C.*; 宮武 宇也*; 百田 佐多夫*; 橋本 尚志*; 今井 伸明*; 松多 健策*; 石山 博恒*; 市川 進一; 石井 哲朗  ; 泉川 卓司*; 片山 一郎*; 川上 宏金*; 川村 広和*; 西中 一朗; 西尾 勝久   ; 牧井 宏之   ; 光岡 真一; 長 明彦  ; 乙川 義憲  ; 佐藤 哲也   

Hirayama, Yoshikazu*; Mihara, Mototsugu*; Watanabe, Yutaka*; Jeong, S. C.*; Miyatake, Hiroari*; Momota, Sadao*; Hashimoto, Takashi*; Imai, Nobuaki*; Matsuta, Kensaku*; Ishiyama, Hironobu*; Ichikawa, Shinichi; Ishii, Tetsuro; Izumikawa, Takuji*; Katayama, Ichiro*; Kawakami, Hirokane*; Kawamura, Hirokazu*; Nishinaka, Ichiro; Nishio, Katsuhisa; Makii, Hiroyuki; Mitsuoka, Shinichi; Osa, Akihiko; Otokawa, Yoshinori; Sato, Tetsuya

The tilted-foil method for producing spin-polarized radioactive isotope beams has been studied for the application to nuclear physics and materials science, using the radioactive nucleus Li produced at the Tokai Radioactive Ion Accelerator Complex (TRIAC). We successfully produced polarization in a Li beam using 15 thin polystyrene foils fabricated especially for this purpose. A systematic study of the nuclear polarization as a function of the number of foils, beam energy, tilt angles and foil material has been performed, confirming the features of the tilted-foil technique experimentally. The contributions made to the nuclear polarization of Li nuclei by the atomic states was investigated.