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arXiv 2106.01685physics.ins-dethep-ex
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稀有事件搜寻实验中铜的宇宙成因活化研究

Study on cosmogenic activation in copper for rare event search experiments

Ze She, Zhi Zeng, Hao Ma, Qian Yue, Mingkun Jing, Jianping Cheng, Junli Li, Hui Zhang

摘要:

为了防止宇宙射线,在地下实验室进行了使用锗探测器的稀有事件搜索实验。然而,地面上的铜探测器组件的宇宙成因激活将产生长半衰期放射性同位素,并不断增加预期的本底水平。本文介绍了在中国锦屏地下实验室(CJPL)外海拔2469.4 m暴露504天后铜的宇宙成因活化研究。使用CJPL的低本底锗γ射线谱仪测量了铜砖中产生的宇宙成因核素的比活度。在海平面,以原子核/千克/天为单位的生产率分别为:Mn-54 18.6 \pm 2.0,Co-56 9.9 \pm 1.3,Co-57 48.3 \pm 5.5,Co-58 51.8 \pm 2.5,Co-60 39.7 \pm 5.7。考虑到锗探测器的预期暴露历史,进行蒙特卡罗模拟以评估探测器的铜组分的宇宙背景贡献。

英文摘要:

The rare event search experiments using germanium detectors are performed in the underground laboratories to prevent cosmic rays. However, the cosmogenic activation of the cupreous detector components on the ground will generate long half-life radioisotopes and contribute continually to the expected background level. We present a study on the cosmogenic activation of copper after 504 days of exposure at an altitude of 2469.4 m outside the China Jinping Underground Laboratory (CJPL). The specific activities of the cosmogenic nuclides produced in the copper bricks were measured using a low background germanium gamma-ray spectrometer at CJPL. The production rates at sea level, in units of nuclei/kg/day, are 18.6 \pm 2.0 for Mn-54, 9.9 \pm 1.3 for Co-56, 48.3 \pm 5.5 for Co-57, 51.8 \pm 2.5 for Co-58 and 39.7 \pm 5.7 for Co-60, respectively. Given the expected exposure history of the germanium detectors, a Monte Carlo simulation is conducted to assess the cosmogenic background contributions of the detectors' cupreous components.

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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