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New measurement of the relative scintillation efficiency of xenon nuclear recoils below 10 keV

被引：64
作者：
Aprile, E. [3 ]
Baudis, L. [1 ]
Choi, B. [3 ]
Giboni, K. L. [3 ]
Lim, K. [3 ]
Manalaysay, A. [1 ,2 ]
Monzani, M. E. [3 ]
Plante, G. [3 ]
Santorelli, R. [3 ]
Yamashita, M. [3 ]
机构：
[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[3] Columbia Univ, Dept Phys, New York, NY 10027 USA
来源：
PHYSICAL REVIEW C | 2009年 / 79卷 / 04期
基金：
美国国家科学基金会; 美国国家卫生研究院;
关键词：
DARK-MATTER; LIQUID XENON; PULSE-SHAPE; ENERGY;
D O I：
10.1103/PhysRevC.79.045807
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Liquid xenon is an important detection medium indirect dark matter experiments, which search for low-energy nuclear recoils produced by the elastic scattering of WIMPs with quarks. The two existing measurements of the relative scintillation efficiency of nuclear recoils below 20 keV lead to inconsistent extrapolations at lower energies. This results in a different energy scale and thus sensitivity reach of liquid xenon dark matter detectors. We report a new measurement of the relative scintillation efficiency below 10 keV performed with a liquid xenon scintillation detector, optimized for maximum light collection. Greater than 95% of the interior surface of this detector was instrumented with photomultiplier tubes, giving a scintillation yield of 19.6 photoelectrons/keV electron equivalent for 122-keV gamma rays. We find that the relative scintillation efficiency for nuclear recoils of 5 keV is 0.14, staying constant around this value up to 10 keV. For higher energy recoils we measure a value of 0.21, consistent with previously reported data. In light of this new measurement, the XENON10 experiment's upper limits on spin-independent WIMP-nucleon cross section, which were calculated assuming a constant 0.19 relative scintillation efficiency, change from 8.8 x 10(-44) cm(2) to 9.9 x 10(-44) cm(2) for WIMPs of mass 100 GeV/c(2), and from 4.5 x 10(-44) cm(2) to 5.6 x 10(-44) cm(2) for WIMPs of mass 30 GeV/c(2).
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页数：7
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