Measurements of scintillation efficiency and pulse shape for low energy recoils in liquid xenon

被引:75
|
作者
Akimov, D
Bewick, A
Davidge, D
Dawson, J
Howard, AS
Ivaniouchenkov, I
Jones, WG
Joshi, J
Kudryavtsev, VA
Lawson, TB
Lebedenko, V
Lehner, MJ
Lightfoot, PK
Liubarsky, I
Lüscher, R
McMillan, JE
Peak, CD
Quenby, JJ
Spooner, NJC
Sumner, TJ
Tovey, DR
Ward, CK
机构
[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
[2] Inst Theoret & Expt Phys, Moscow 117259, Russia
[3] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Dept Phys, London SW7 2BZ, England
关键词
liquid xenon; dark matter; WIMP; quenching factor; pulse shape;
D O I
10.1016/S0370-2693(01)01411-3
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40-70 keV. Under the assumption of a single dominant decay component to the scintillation pulse shape the log-normal mean parameter To of the maximum likelihood estimator of the decay time constant for 6 keV < E-ee < 30 keV nuclear recoil events is equal to 21.0 +/- 0.5 ns. It is observed that for electron recoils T-0 rises slowly with energy, having a value similar to 30 ns at E-ee similar to 15 keV. Electron and nuclear recoil pulse shapes are found to be well fitted by single exponential functions although some evidence is found for a double exponential form for the nuclear recoil pulse shape. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:245 / 251
页数:7
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