Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons

高強度パルス中性子源を用いた中性子捕獲反応における線円偏光度の測定

遠藤 駿典   ; 安部 亮太*; 藤岡 宏之*; 猪野 隆*; 岩本 修  ; 岩本 信之  ; 河村 しほり*; 木村 敦   ; 北口 雅暁*; 小林 龍珠*; 中村 詔司  ; 奥 隆之   ; 奥平 琢也*; 奥泉 舞桜*; Omer, M.  ; Rovira Leveroni, G.   ; 嶋 達志*; 清水 裕彦*; 静間 俊行*; 平 義隆*; 高田 秀佐*; 高橋 慎吾*; 吉川 大幹*; 吉岡 瑞樹*; Zen, H.*

Endo, Shunsuke; Abe, Ryota*; Fujioka, Hiroyuki*; Ino, Takashi*; Iwamoto, Osamu; Iwamoto, Nobuyuki; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; Nakamura, Shoji; Oku, Takayuki; Okudaira, Takuya*; Okuizumi, Mao*; Omer, M.; Rovira Leveroni, G.; Shima, Tatsushi*; Shimizu, Hirohiko*; Shizuma, Toshiyuki*; Taira, Yoshitaka*; Takada, Shusuke*; Takahashi, Shingo*; Yoshikawa, Hiromoto*; Yoshioka, Tamaki*; Zen, H.*

Measurements of -ray circular polarization emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited states can be determined by measuring the circular polarization from polarized neutron capture reactions. Furthermore, the -ray circular polarization in a neutron capture resonance is crucial for studying the enhancement effect of parity nonconservation in compound nuclei. The -ray circular polarization can be measured using a polarimeter based on magnetic Compton scattering. A polarimeter was constructed, and its performance indicators were evaluated using a circularly polarized -ray beam. Furthermore, as a demonstration, the -ray circular polarization was measured in S(n,)S reactions with polarized neutrons.