A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX
A Monte Carlo study for the shielding of γ backgrounds induced by radionuclides for CDEX
复制标题
DOI：
10.1088/1674-1137/35/3/013
复制
发表时间：
2011-03
影响因子：
3.6
通讯作者：
L. Lei;Y. Qian;Tang Chang-jian;C. Jianping;Kang Ke-jun;Li Jian-min;Li Jin;Li Yu-lan;L. Yuanjing;Ma Hao;H. Wong;Xue Tao;Zeng Zhi
中科院分区：
文献类型：
--
作者：
L. Lei;Y. Qian;Tang Chang-jian;C. Jianping;Kang Ke-jun;Li Jian-min;Li Jin;Li Yu-lan;L. Yuanjing;Ma Hao;H. Wong;Xue Tao;Zeng Zhi
CDEX（中国暗物质实验）合作将在CJPL（中国金平深地下实验室）使用超低能量阈值高纯锗（ULE-HPGe）探测器直接搜索WIMP（弱相互作用大质量粒子）。设计了一种用于降低本底的复合屏蔽系统，并利用GEANT 4 Monte Carlo模拟研究了D（γ，n）p反应对放射性核素和中子本底产生的γ射线的有效降低。在预期目标约束下，估算了屏蔽材料的允许放射性纯度上限。与其他低本底稀有事件实验报道的放射性纯度相比，这表明CDEX中使用的屏蔽可以由可获得的放射性纯度的材料制成。
The CDEX (China Dark matter EXperiment) Collaboration will carry out a direct search for WIMPs (Weakly Interacting Massive Particles) using an Ultra-Low Energy Threshold High Purity Germanium (ULE-HPGe) detector at the CJPL (China JinPing deep underground Laboratory). A complex shielding system was designed to reduce backgrounds and a detailed GEANT4 Monte Carlo simulation was performed to study the achievable reduction of γ rays induced by radionuclides and neutron backgrounds by D(γ,n)p reaction. Furthermore, the upper level of allowed radiopurity of shielding materials was estimated under the constraint of the expected goal. Compared with the radiopurity reported by other low-background rare-event experiments, it indicates that the shielding used in the CDEX can be made out of materials with obtainable radiopurity.