Measurement of the scintillation time spectra and pulse-shape discrimination of low-energy β and nuclear recoils in liquid argon with DEAP-1

被引：34

作者：

Amaudruz, P-A. ^{[11
]}

Batygov, M. ^{[3
,13
]}

Beltran, B. ^{[1
]}

Bonatt, J. ^{[7
]}

Boudjemline, K. ^{[2
]}

Boulay, M. G. ^{[2
,7
]}

Broerman, B. ^{[7
]}

Bueno, J. F. ^{[1
]}

Butcher, A. ^{[8
]}

Cai, B. ^{[7
]}

Caldwell, T. ^{[6
]}

Chen, M. ^{[7
]}

Chouinard, R. ^{[1
]}

Cleveland, B. T. ^{[3
,9
]}

Cranshaw, D. ^{[7
]}

Dering, K. ^{[7
]}

Duncan, F. ^{[3
,9
]}

Fatemighomi, N. ^{[8
]}

Ford, R. ^{[3
,9
]}

Gagnon, R. ^{[7
]}

Giampa, P. ^{[7
]}

Giuliani, F. ^{[4
]}

Gold, M. ^{[4
]}

Golovko, V. V. ^{[7
,14
]}

Gorel, P. ^{[1
]}

Grace, E. ^{[8
]}

Graham, K. ^{[2
]}

Grant, D. R. ^{[1
]}

Hakobyan, R. ^{[1
]}

Hallina, A. L. ^{[1
]}

Hamstra, M. ^{[2
]}

Harvey, P. ^{[7
]}

Hearns, C. ^{[7
]}

Hofgartner, J. ^{[3
,15
]}

Jillings, C. J. ^{[3
,9
]}

Kuzniak, M. ^{[7
,13
]}

Lawson, I. ^{[3
,9
]}

La Zia, F. ^{[8
]}

Li, O. ^{[9
]}

Lidgard, J. J. ^{[7
]}

Liimatainen, P. ^{[9
]}

Lippincott, W. H. ^{[12
,16
]}

Mathew, R. ^{[7
]}

McDonald, A. B. ^{[7
]}

McElroy, T. ^{[1
]}

McFarlane, K. ^{[9
]}

McKinsey, D. N. ^{[12
]}

Mehdiyev, R. ^{[2
]}

Monroe, J. ^{[8
]}

Muir, A. ^{[11
]}

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2R3, Canada

[2] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[3] Laurentian Univ, Dept Phys & Astron, Sudbury, ON P3E 2C6, Canada

[4] Univ New Mexico, Dept Phys, Albuquerque, NM 87131 USA

[5] Univ N Carolina, Chapel Hill, NC 27517 USA

[6] Univ Penn, Dept Phys, Philadelphia, PA 19104 USA

[7] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada

[8] Royal Holloway Univ London, Egham Hill, Egham TW20 0EX, Surrey, England

[9] SNOLAB, Lively, ON P3Y 1M3, Canada

[10] Univ Sussex, Sussex House, Brighton BN1 9RH, E Sussex, England

[11] TRIUMF, Vancouver, BC V6T 2A3, Canada

[12] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[13] Carleton Univ, Ottawa, ON K1S 5B6, Canada

[14] CNL, Chalk River, ON K0J 1J0, Canada

[15] Cornell Univ, Ithaca, NY 14850 USA

[16] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[17] LANL, POB 1663, Los Alamos, NM 87545 USA

[18] Univ Nacl Autonoma Mexico, Inst Fis, POB 20-364, Mexico City 01000, DF, Mexico

来源：

ASTROPARTICLE PHYSICS | 2016年 / 85卷

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

Dark matter; WIMPs; Liquid noble gas detector; Liquid argon; Pulse-shape discrimination; DEAP; DARK-MATTER; DEPENDENCE; AR-39;

D O I：

10.1016/j.astropartphys.2016.09.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The DEAP-1 low-background liquid argon detector was used to measure scintillation pulse shapes of electron and nuclear recoil events and to demonstrate the feasibility of pulse-shape discrimination down to an electron-equivalent energy of 20 keV(ee). In the surface dataset using a triple-coincidence tag we found the fraction of,6 events that are misidentified as nuclear recoils to be < 1.4 x 10(-7) (90% C.L.) for energies between 43-86 keV(ee) and for a nuclear recoil acceptance of at least 90%, with 4% systematic uncertainty on the absolute energy scale. The discrimination measurement on surface was limited by nuclear recoils induced by cosmic-ray generated neutrons. This was improved by moving the detector to the SNOLAB underground laboratory, where the reduced background rate allowed the same measurement to be done with only a double-coincidence tag. The combined data set contains 1.23 x 10(8) events. One of those, in the underground data set, is in the nuclear-recoil region of interest. Taking into account the expected background of 0.48 events coming from random pileup, the resulting upper limit on the level of electronic recoil contamination is < 2.7 x 10(-8) (90% C.L.) between 44-89 keV(ee) and for a nuclear recoil acceptance of at least 90%, with 6% systematic uncertainty on the absolute energy scale. We developed a general mathematical framework to describe pulse-shape-discrimination parameter distributions and used it to build an analytical model of the distributions observed in DEAP-1. Using this model, we project a misidentification fraction of approximately 10(-10) for an electron-equivalent energy threshold of 15 keVee for a detector with 8 PE/keV(ee) light yield. This reduction enables a search for spin independent scattering of WIMPs from 1000 kg of liquid argon with a WIMP-nucleon cross-section sensitivity of 10(-46) cm(2), assuming negligible contribution from nuclear recoil backgrounds. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：1 / 23

页数：23

共 25 条

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