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arXiv 1104.2587nucl-exastro-ph.CO
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低能核素在液体Xenon中闪烁效率的新测量

New Measurement of the Scintillation Efficiency of Low-Energy Nuclear Recoils in Liquid Xenon

G. Plante, E. Aprile, R. Budnik, B. Choi, K. -L. Giboni, L. W. Goetzke, R. F. Lang, K. E. Lim, A. J. Melgarejo Fernandez

摘要:

使用液态氙(LXe)作为探测介质的粒子探测器是寻找暗物质弱相互作用大质量粒子(WIMP)的主要技术之一。一个关键的使能因素是LIMPs目标中WIMP相互作用产生的反冲核的低能探测阈值。在这些探测器中,核反冲能量标度基于Leff闪烁信号,因此需要了解核反冲的相对闪烁效率Leff。Leff在低能量下的不确定性是在低质量下从Lupiter WIMP搜索报告的结果中最大的系统不确定性。在XENON暗物质项目的背景下,专门为低能量下的Leff测量设计和制造了一种新的Leff闪烁探测器,重点是最大限度地提高闪烁光探测效率,以获得尽可能低的能量阈值。我们报告新的测量Leff在低能量与此检测器进行。我们的结果表明,Leff随能量缓慢下降,从15 keV时的0.144 +/- 0.009下降到3 keV时的0.088 + 0.014 - 0.015。

英文摘要:

Particle detectors that use liquid xenon (LXe) as detection medium are among the leading technologies in the search for dark matter weakly interacting massive particles (WIMPs). A key enabling element has been the low-energy detection threshold for recoiling nuclei produced by the interaction of WIMPs in LXe targets. In these detectors, the nuclear recoil energy scale is based on the LXe scintillation signal and thus requires knowledge of the relative scintillation efficiency of nuclear recoils, Leff. The uncertainty in Leff at low energies is the largest systematic uncertainty in the reported results from LXe WIMP searches at low masses. In the context of the XENON Dark Matter project, a new LXe scintillation detector has been designed and built specifically for the measurement of Leff at low energies, with an emphasis on maximizing the scintillation light detection efficiency to obtain the lowest possible energy threshold. We report new measurements of Leff at low energies performed with this detector. Our results suggest a Leff which slowly decreases with energy, from 0.144 +/- 0.009 at 15 keV down to 0.088 +0.014 -0.015 at 3 keV.

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