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arXiv 2206.09288physics.ins-dethep-exnucl-ex
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中国JinPing地下实验室100 Mo基测辐射热示范实验的宇宙背景研究

Cosmogenic background study for a 100Mo-based bolometric demonstration experiment at China JinPing underground Laboratory

W. Chen, L. Ma, J. H. Chen, H. Z. Huang, Y. G. Ma

摘要:

对中国金平地下实验室10 kg $^{100}$钼基无中微子双β衰变($0νββ$)测辐射热演示实验进行了模拟研究。基于CRY库中的模拟宇宙线数据,利用Geant 4工具包研究了$^{100}$富钼锂单晶和探测器系统铜组件中放射性核素的宇宙成因产生。研究了对$^{100}$钼基$0νββ$实验有害的宇宙成因放射性核素$^{56}$ Co、$^{82}$ Rb和$^{88}$ Y的本底能谱。然后,我们评估总宇宙背景水平的$^{100}$钼$0νββ$搜索能量感兴趣的区域(ROI)的演示实验。在地下冷却一年后,发现晶体和铜组分的剩余背景贡献分别为1.8 $\times$ 10 $^{-6}$ cts/kg/keV/yr和3.3 $\times$ 10 $^{-4}$ cts/kg/keV/yr。在此基础上,利用CJPL中子、质子模拟谱计算了铜锂单晶的地下宇宙成因活化。地下宇宙背景被认为是可以忽略不计的ROI。

英文摘要:

We perform simulation study for a 10-kg $^{100}$Mo-based bolometeric demonstration experiment for neutrinoless double-beta decay ($0νββ$) search at China JinPing underground Laboratory (CJPL). Cosmogenic production of radionuclides in $^{100}$Mo-enriched lithium molybdate crystals and copper components of the detector system are studied using Geant4 toolkit based on the simulated cosmic ray data from the CRY library. Background energy spectra of the cosmogenic radionuclides including $^{56}$Co, $^{82}$Rb and $^{88}$Y which are harmful for the $^{100}$Mo-based $0νββ$ experiment are investigated. We then evaluate the total cosmogenic background level in the $^{100}$Mo $0νββ$ search energy region of interest (ROI) for the demonstration experiment. After one year of cooling down underground, the residual background contribution is found to be 1.8$\times$10$^{-6}$ cts/kg/keV/yr and 3.3$\times$10$^{-4}$ cts/kg/keV/yr from crystals and copper components, respectively. Furthermore, underground cosmogenic activation of copper and lithium molybdate crystal is calculated based on the simulation spectra of neutron and proton in CJPL. The underground cosmogenic background is found to be negligible in the ROI.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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