5~10MeV能区γ本底对锦屏深地核天体物理反应测量的影响探究  

Influence of 5~10MeVγbackground on measurements of astrophysical reactions at the JUNA facility

作　　者：盛耀德 苏俊 何建军 张立勇 张昊 王泺欢 谌阳平 李志宏[2] 郭冰[2] 连刚[2] 柳卫平[2] SHENG Yaode;SU Jun;HE Jianjun;ZHANG Liyong;ZHANG Hao;WANG Luohuan;SHEN Yangping;LI Zhihong;GUO Bing;LIAN Gang;LIU Weiping(Key Laboratory of Beam Technology of Ministry of Education,Collge of Nuclear Science and Technology,Beijing Normal University,100875,Beijing,China;China Institute of Atomic Energy,102413,Beijing,China)

机构地区：[1]射线束技术教育部重点实验室,北京师范大学核科学与技术学院,北京100875 [2]中国原子能科学研究院,北京102413

出　　处：《北京师范大学学报（自然科学版）》2022年第5期727-732,共6页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(U1867211,11490563,11490560)。

摘　　要：天体物理感兴趣能区(伽莫夫窗口)的带电粒子核反应截面极小,在地面进行测量会受到宇宙射线诱发本底的严重干扰.进行地下实验室核反应测量成为解决这一问题的主要途径.锦屏深地核天体物理实验(JUNA)装置是我国首个地下核天体反应测量设施,为开展恒星核合成关键反应直接测量提供了绝佳机遇.本工作测量了锗酸铋(BGO)探测阵列和溴化镧(LaBr)探测器在JUNA装置上的γ本底能谱,并通过减小符合时间、点火数选择、粒子甄别等技术,进一步压低了5~10 MeV能区的γ本底,同时讨论了探测器本底对部分JUNA计划开展的核天体反应测量的影响.Cross-sections of charged particle induced reactions in the energy region of astrophysics interest(Gamow window)are extremely low,thus measurements of these reactions in aboveground laboratory will be severely disturbed by background induced by cosmic rays.The main way to solve this problem is to measure these reactions in an underground laboratory.The Jinping Underground Nuclear Astrophysics(JUNA)experimental facility is the first underground nuclear astrophysical facility in China,the facility is superb to study key reactions of astrophysical importance.Backgrounds of BGO detector array and LaBrdetector were measured at JUNA and compared with those measured aboveground.It was found that background from 5-10 MeV could be further suppressed by reducing coincidence window,selecting fire number,and by removingαparticle signals with pulseshape discrimination.Possible influence of current background on several planned reaction measurements at JUNA has been evaluated.

关 键 词：核天体反应直接测量 地下实验室 BGO探测阵列 LaBr3探测器 γ本底 

分 类 号：TL812.1[核科学技术—核技术及应用]