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

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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Category:Physics, Nuclear

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