论文标题
$^{117} $ sn（n，$γ$）$γ$ -rays的横向不对称的测量
Measurement of the transverse asymmetry of $γ$-rays in the $^{117}$Sn(n,$γ$)$^{118}$Sn reaction
论文作者
论文摘要
当前，在通过表皮中子引起的化合物共振中观察到的奇偶校验侵入效应很大程度上归因于化合物状态的入口通道中奇偶校验不受欢迎的部分振幅的混合。此外，有人提出，增强平等侵犯的相同机制还可以增强化合物核中时间不转换的破坏。入口通道混合会诱导从复合核状态发出的个体$γ$ - 砂的能量依赖性自旋角相关性。为了详细研究混合模型，使用$^{117} $ sn（n，$γ$）$^{118} $ sn的反应中的$γ$ ray产量是使用偏振上皮中子和GE检测器的脉冲梁测量的。观察到不对称$γ$ ray的角度依赖性在中子极化的方向上产生。
Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity-violation also enhances the breaking of time-reversal-invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual $γ$-rays emitted from the compound nuclear state. For a detailed study of the mixing model, a $γ$-ray yield in the reaction of $^{117}$Sn(n,$γ$)$^{118}$Sn was measured using the pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric $γ$-ray yields for the orientation of the neutron polarization was observed.
