角分辨硅望远镜数据分析方法研究
Study of a data analysis method for the angle resolving silicon telescope
摘要：
针对欧洲核子研究中心（CERN）中子飞行时间装置n_TOF上的角分辨硅望远镜，提出了一种新的数据分析方法。该望远镜已被用于测量几个中子与带电粒子在出口通道引起的反应。最新联合测量n_TOF的$^{12}$ C（$n,p$）和$^{12}$ C（$n,d$）反应，需要开发一种非常详细的方法。这些数据的可靠分析必须考虑到所涉及的反应的挑战性，因为它们受到子核中的多个激发态的影响，并以反应产物的各向异性角分布为特征。完整的分析程序旨在从由单独的硅条对检测到的符合计数的整数分别重建所有相关的反应参数-绝对横截面、分支比和角分布。在与n_TOF的$^{12}$ C（$n,p$）和$^{12}$ C（$n,d$）测量相关的特定条件下测试该程序，以评估其对这些实验数据的直接适用性。根据得出的结论，原来的方法是适应输入数据的不确定性的特定水平。
英文摘要：
A new data analysis method is developed for the angle resolving silicon telescope introduced at the neutron time of flight facility n_TOF at CERN. The telescope has already been used in measurements of several neutron induced reactions with charged particles in the exit channel. The development of a highly detailed method is necessitated by the latest joint measurement of the $^{12}$C($n,p$) and $^{12}$C($n,d$) reactions from n_TOF. The reliable analysis of these data must account for the challenging nature of the involved reactions, as they are affected by the multiple excited states in the daughter nuclei and characterized by the anisotropic angular distributions of the reaction products. The unabridged analysis procedure aims at the separate reconstruction of all relevant reaction parameters - the absolute cross section, the branching ratios and the angular distributions - from the integral number of the coincidental counts detected by the separate pairs of silicon strips. This procedure is tested under the specific conditions relevant for the $^{12}$C($n,p$) and $^{12}$C($n,d$) measurements from n_TOF, in order to assess its direct applicability to these experimental data. Based on the reached conclusions, the original method is adapted to a particular level of uncertainties in the input data.
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