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arXiv 2112.09702hep-phastro-ph.COhep-ex
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Sub-GeV暗物质探测器中γ射线的声子背景

The Phonon Background from Gamma Rays in Sub-GeV Dark Matter Detectors

Kim V. Berghaus, Rouven Essig, Yonit Hochberg, Yutaro Shoji, Mukul Sholapurkar

摘要:

来自放射性污染物的具有$\mathcal{O}$(MeV)能量的高能光子可以在固态靶材料中散射,并构成亚GeV暗物质直接探测搜索的重要低能背景。这种背景是最明显的能量存款在$1 - 100$毫电子伏范围内,由于部分相干散射增强的前向散射方向。我们全面量化的Si,Ge,GaAs,SiC和Al $_2$ O $_3$目标材料,这是低质量暗物质搜索的目标材料的代表所产生的单和多声子背景。我们使用了一个现实的高能光子背景表示,并将预期的背景声子谱与预期的暗物质信号声子谱进行对比。需要一个积极的否决权来充分抑制这种背景,以便即使在屏蔽良好的环境中也能探测到暗物质信号。为了比较,我们还显示了预期的单声子和多声子事件率从相干中微子核散射由于太阳中微子,并发现它们是次主导的光子诱导的声子背景。

英文摘要:

High-energy photons with $\mathcal{O}$(MeV) energies from radioactive contaminants can scatter in a solid-state target material and constitute an important low-energy background for sub-GeV dark matter direct-detection searches. This background is most noticeable for energy deposits in the $1 - 100$ meV range due to the partially coherent scattering enhancement in the forward scattering direction. We comprehensively quantify the resulting single- and multi-phonon background in Si, Ge, GaAs, SiC, and Al$_2$O$_3$ target materials, which are representative of target materials of interest in low-mass dark matter searches. We use a realistic representation of the high-energy photon background, and contrast the expected background phonon spectrum with the expected dark matter signal phonon spectrum. An active veto is needed to suppress this background sufficiently in order to allow for the detection of a dark matter signal, even in well-shielded environments. For comparison we also show the expected single- and multi-phonon event rates from coherent neutrino-nucleus scattering due to solar neutrinos, and find that they are sub-dominant to the photon-induced phonon background.

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