在中国散裂中子源上对13C集团结构的研究

At the Back-n white-light neutron facility in China Spallation Neutron Source (CSNS),higher excited states of 13C are populated by reaction of 7-50MeV neutrons with 12C. The energy and angular double differential reaction cross sections of alpha particles emitted are measured by ∆E-E telescope detectors consisting of multi-wire proportional chamber and Silicon.According to the energy of incident neutrons, different exit channels of alpha particles are distinguished, and different distribution of double differential reaction cross sections are obtained.The experimental results are compared with the theoretical cluster model, and the intrinsic physics of 13C cluster structure is studied.The constraints are provided for the cluster model.In addition, more detailed nuclear data are serviced for the simulation calculation of nuclear reactor.

在中国散裂中子源的反角白光中子束线上，利用7-50MeV的中子轰击12C布居13C的高激发能态，通过低压多丝正比室与Si组成的∆E-E望远镜探测器测量出射α粒子的能量和角双微分反应截面。依据入射中子的能量区分产生α粒子的不同出射反应道，得到不同的双微分反应截面的分布。将实验结果与理论集团模型的计算结果进行比较分析，研究13C集团结构的内在物理规律，为集团模型提供约束。此外，为核反应堆的模拟计算提供更为详细的核数据。

在中国散裂中子源反角白光终端，测量了从6.3MeV到102.3MeV122个能量点12C(n,a)x的角微分反应截面。利用轻带点粒子探测器阵列(LPDA)∆E-E望远镜系统，测量了在实验室坐标系下从24.5°到155.5°12C(n,a)x的角微分反应截面。实验结果能够很好的符合以前的实验结果，并且与Talys和Geant4的模拟计算结果进行了比较。在中子能量为13.7MeV、22.4MeV、29.5MeV和61.8MeV的位置第一次发现了结构。由于缺少实验数据，这项工作为相关数据库提供了重要参考。