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Energy-dependent angular distribution of individual $$gamma$$ rays in the $$^{139}$$La($$n, gamma$$)$$^{140}$$La$$^{ast}$$ reaction

$$^{139}$$La($$n, gamma$$)$$^{140}$$La$$^{ast}$$反応における個々のガンマ線の中性子エネルギー依存角度分布

奥平 琢也*; 遠藤 駿典  ; 藤岡 宏之*; 広田 克也*; 石崎 貢平*; 木村 敦  ; 北口 雅暁*; 古賀 淳*; 新實 裕大*; 酒井 健二 ; 嶋 達志*; 清水 裕彦*; 高田 秀佐*; 谷 結以花*; 山本 知樹*; 吉川 大幹*; 吉岡 瑞樹*

Okudaira, Takuya*; Endo, Shunsuke; Fujioka, Hiroyuki*; Hirota, Katsuya*; Ishizaki, Kohei*; Kimura, Atsushi; Kitaguchi, Masaaki*; Koga, Jun*; Ninomi, Yudai*; Sakai, Kenji; Shima, Tatsushi*; Shimizu, Hirohiko*; Takada, Shusuke*; Tani, Yuika*; Yamamoto, Tomoki*; Yoshikawa, Hiromoto*; Yoshioka, Tamaki*

Neutron energy-dependent angular distributions were observed for individual $$gamma$$ rays from the 0.74 eV $$p$$-wave resonance of $$^{139}$$La+$$n$$ to several lower excited states of $$^{140}$$La. The $$gamma$$-ray signals were analyzed in a two dimensional histogram of the $$gamma$$-ray energy, measured with distributed germanium detectors, and neutron energy, determined with the time-of-flight of pulsed neutrons, to identify the neutron energy dependence of the angular distribution for each individual $$gamma$$ rays. The angular distribution was also found for a photopeak accompanied with a faint $$p$$-wave resonance component in the neutron energy spectrum. Our results can be interpreted as interference between $$s$$- and $$p$$-wave amplitudes which may be used to study discrete symmetries of fundamental interactions.

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分野:Physics, Nuclear

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