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arXiv 2101.00262nucl-ex
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$^{139}$ La(PDMATHAAC,$γ$)$^{140}$ La* 反应中单个$γ$ -射线的能量依赖角分布

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

T. Okudaira, S. Endo, H. Fujioka, K. Hirota, K. Ishizaki, A. Kimura, M. Kitaguchi, J. Koga, Y. Niinomi, K. Sakai, T. Shima, H. M. Shimizu, S. Takada, Y. Tani, T… 展开作者

T. Okudaira, S. Endo, H. Fujioka, K. Hirota, K. Ishizaki, A. Kimura, M. Kitaguchi, J. Koga, Y. Niinomi, K. Sakai, T. Shima, H. M. Shimizu, S. Takada, Y. Tani, T. Yamamoto, H. Yoshikawa, T. Yoshioka

摘要:

从$^{139}$ La+ $n$的0.74 eV p波共振到$^{140}$ La的几个较低激发态,观察到单个$γ$ -射线的中子能量依赖角分布。在用分布式锗探测器测量的$γ$射线能量和用脉冲中子的飞行时间确定的中子能量的二维直方图中分析$γ$射线信号,以识别每个单独的$γ$射线的角分布的中子能量依赖性。角分布也被发现为一个伴随着微弱的p波共振分量的中子能谱的一个峰。我们的结果可以解释为s-和p-波振幅之间的干涉,可以用来研究离散对称性的基本相互作用。

英文摘要:

Neutron energy-dependent angular distributions were observed for individual $γ$-rays from the 0.74 eV p-wave resonance of $^{139}$La+$n$ to several lower excited states of $^{140}$La. The $γ$-ray signals were analyzed in a two dimensional histogram of the $γ$-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 $γ$-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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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