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arXiv 2108.02176physics.ins-detastro-ph.IMhep-ex
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超流$^4$ He中电子反冲和核反冲的闪烁产额

Scintillation yield from electronic and nuclear recoils in superfluid $^4$He

HeRALD Collaboration, A. Biekert, C. Chang, C. W. Fink, M. Garcia-Sciveres, E. C. Glazer, W. Guo, S. A. Hertel, S. Kravitz, J. Lin, M. Lisovenko, R. Mahapatra, … 展开作者

HeRALD Collaboration, A. Biekert, C. Chang, C. W. Fink, M. Garcia-Sciveres, E. C. Glazer, W. Guo, S. A. Hertel, S. Kravitz, J. Lin, M. Lisovenko, R. Mahapatra, D. N. McKinsey, J. S. Nguyen, V. Novosad, W. Page, P. K. Patel, B. Penning, H. D. Pinckney, M. Pyle, R. K. Romani, A. S. Seilnacht, A. Serafin, R. J. Smith, P. Sorensen, B. Suerfu, A. Suzuki, V. Velan, G. Wang, S. L. Watkins, V. G. Yefremenko, L. Yuan, J. Zhang

摘要:

超流$^4$ He是直接探测光($<$ 1 GeV)暗物质的一种很有前途的靶材料。在这种介质中可用于读出的可能的信号通道包括提示光子,三重态准分子,以及旋子和声子准粒子。这些信号的相对产率对超流$^4$ He暗物质探测器的灵敏度和分辨能力有影响。用16 cm $^3$体积的1.75 K超流$^4$ He,用6个浸没的光电倍增管读出,测量了36.3 - 185 keV $_\mathrm{ee}$的电子反冲闪烁,得到平均信号大小为$1.25^{+0.03}_{-0.03}$ ~phe/keV $_\mathrm{ee}$,核反冲为53.2 - 1090 keV $_\mathrm{nr}$。我们比较我们的相对闪烁产额测量的结果,现有的半经验模型的基础上氦-氦和电子-氦相互作用截面。我们还研究了延迟闪烁成分作为反冲类型和能量的函数的行为,这是超流$^4$ He中信号鉴别的进一步途径。

英文摘要:

Superfluid $^4$He is a promising target material for direct detection of light ($<$ 1 GeV) dark matter. Possible signal channels available for readout in this medium include prompt photons, triplet excimers, and roton and phonon quasiparticles. The relative yield of these signals has implications for the sensitivity and discrimination power of a superfluid $^4$He dark matter detector. Using a 16~cm$^3$ volume of 1.75~K superfluid $^4$He read out by six immersed photomultiplier tubes, we measured the scintillation from electronic recoils ranging between 36.3 and 185 keV$_\mathrm{ee}$, yielding a mean signal size of $1.25^{+0.03}_{-0.03}$~phe/keV$_\mathrm{ee}$, and nuclear recoils from 53.2 to 1090 keV$_\mathrm{nr}$. We compare the results of our relative scintillation yield measurements to an existing semiempirical model based on helium-helium and electron-helium interaction cross sections. We also study the behavior of delayed scintillation components as a function of recoil type and energy, a further avenue for signal discrimination in superfluid $^4$He.

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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