用于逆运动学(^(3)He,t)电荷交换反应实验探测系统的研制  

Development of Detection System for(^(3)He,t)Charge Exchange Reaction Experiment in Inverse Kinematics

作　　者：何志轩 李蒙 卜文娟 杨贺润[3] 胡碧涛[1] 张毅 HE Zhixuan;LI Meng;BU Wenjuan;YANG Herun;HU Bitao;ZHANG Yi(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Department of Oncology,The Second Xiangya Hospital,Central South University,Changsha 410011,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]中南大学湘雅二医院,长沙410000 [3]中国科学院近代物理研究所,兰州730000

出　　处：《原子核物理评论》2024年第1期473-479,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(U2032166,11875301,U1832167);国家重点研发计划项目(2022YFE0103900)。

摘　　要：中能区电荷交换反应可以从自旋-同位旋激发的角度研究原子核复杂结构。利用中国科学院近代物理研究所的放射性束流线,利用逆运动学方法进行电荷交换反应实验,可以将研究的对象核素拓展至丰中子核乃至不稳定核。基于此,设计了用于电荷交换反应实验的探测器系统,该系统主要包括了^(3)He气体靶、TPC和CsI(Tl)阵列,其中TPC和CsI(Tl)阵列构成ΔE-E系统。利用Geant4、Garfield++等模拟软件,优化了TPC的工作条件,确定了实验研究的运动学区间和探测器的基本设计,考察了探测系统的粒子鉴别能力。基于模拟优化,搭建了探测系统,并利用激光测试了TPC的位置分辨,在读出电极平面,位置分辨约为422μm;在电子漂移方向,位置分辨约为681μm。TPC的性能足以支撑对核反应次级粒子的径迹重建,尤其能够实现较高的散射角分辨。Charge exchange reactions with the intermediate energy can be used to study the complex structure of atomic nuclei from the respect of spin-isospin excitation.By utilizing the radioactive beam line at the Institute of Modern Physics,Chinese Academy of Sciences,charge exchange reaction experiments in inverse kinematics can expand the target nuclides to be studied to neutron-rich nuclei and even unstable nuclei.Based on this,a detector system for charge exchange reaction experiments has been designed,which mainly consists of a ^(3)He gas target,TPC and CsI(Tl)arrays,where the TPC and CsI(Tl)arrays form aΔE-E system.Using simulation software such as Geant4 and Garfield++,the operating conditions of the TPC were optimized,the kinematic intervals and the basic design of the detector for the experimental study were determined,and the particle discrimination ability of the detection system was investigated.Based on the simulation,the detection system was built and the spatial resolution of the TPC was measured by using the UV laser.On the readout electrode plane,the resolution is about 422μm.And the resolution is about 681μm in the drift direction.The performance of the TPC is sufficient to support the track reconstruction of the secondary particles of the nuclear reaction,and in particular,it is able to achieve a high resolution of the scattering angle.

关 键 词：探测系统 GEANT4 模拟 电荷交换反应 

分 类 号：O571.1[理学—粒子物理与原子核物理]