未来吨级CDEX实验中锗探测器的宇宙成因激活研究
Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment
摘要：
为了评价天然锗探测器和$^{70}$锗探测器的宇宙成因背景水平，开展了锗的宇宙成因活化研究。用Geant 4和CRY计算了长寿命放射性核素的产生率。通过比较CDEX-1B探测器的模拟光谱和实验光谱，验证了计算结果。基于验证后的程序，预测了未来吨级CDEX实验的宇宙成因背景水平。通过地下锗晶体生长和高纯锗探测器的制作可以达到抑制宇宙起源背景水平的目的，以达到直接探测暗物质的灵敏度要求。在低宇宙成因背景下，开辟了太阳中微子研究和无中微子双β衰变实验等新的物理渠道，并进行了相应的模拟和评价。
英文摘要：
A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and $^{70}$Ge depleted germanium detectors. The production rates of long-lived radionuclides were calculated with Geant4 and CRY. Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels, such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out.
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