$^{118}$ Sn的p波共振产生的$γ$射线的角分布
Angular distribution of $γ$ rays from the p-wave resonance of $^{118}$Sn
摘要：
用锗探测器和脉冲中子束测量了由$^{117}{\rm Sn}(n,γ)$反应产生的$γ$射线随中子能量变化的角分布。在能量为9327 keV的$γ$射线发射中清楚地观察到角分布，其对应于从$^{117}{\rm Sn}+n$的中子共振到$^{118}{\rm Sn}$的基态的跃迁。角分布导致依赖于角度的非对称共振形状。不对称$A_{\rm LH}$定义为$(N_{\rm L}-N_{\rm H})/(N_{\rm L}+N_{\rm H})$，其中$N_{\rm L}$和$N_{\rm H}$分别是中子共振的较低和较高能量区域的积分值。我们发现$A_{\rm LH}$具有$(A \cos θ_γ+B)$的角度依赖性，其中$θ_γ$是相对于入射中子动量的$γ$射线发射角，$A=0.394 \pm 0.073$和$B = 0.118 \pm 0.029$在1.33 eV p波共振中。
英文摘要：
The neutron energy-dependent angular distribution of $γ$ rays from $^{117}{\rm Sn}(n,γ)$ reaction was measured with germanium detectors and a pulsed neutron beam. The angular distribution was clearly observed in $γ$-ray emissions with an energy of 9327 keV which corresponds to the transition from a neutron resonance of $^{117}{\rm Sn}+n$ to the ground state of $^{118}{\rm Sn}$. The angular distribution causes an angular-dependent asymmetric resonance shape. An asymmetry $A_{\rm LH}$ was defined as $(N_{\rm L}-N_{\rm H})/(N_{\rm L}+N_{\rm H})$, where $N_{\rm L}$ and $N_{\rm H}$ are integrated values for lower- and higher-energy regions of a neutron resonance, respectively. We found that the $A_{\rm LH}$ has the angular dependence of $(A \cos θ_γ+B)$, where $θ_γ$ is the $γ$-ray emission angle with respect to the incident neutron momentum, with $A=0.394 \pm 0.073$ and $B = 0.118 \pm 0.029$ in the 1.33 eV p-wave resonance.
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