Radioactive background in a cryogenic dark matter experiment

被引：19
|
作者：
Tomasello, V. [1 ]
Robinson, M. [1 ]
Kudryavtsev, V. A. [1 ]
机构：
[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
来源：
ASTROPARTICLE PHYSICS | 2010年 / 34卷 / 02期
关键词：
Radioactivity; Neutron background; Gamma-ray background; Dark matter; WIMPs; Monte Carlo simulations; DETECTORS; PROPAGATION; SEARCHES; MUSIC; CODE;
D O I：
10.1016/j.astropartphys.2010.05.005
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
New generation dark matter experiments aim at exploring the 10(-9) 10(-10) pb cross-section region for WIMP-nucleon scalar interactions. Neutrons and gamma-rays, due to radioactive processes, are produced in the detector components and are one of the main factors that can limit detector sensitivity. Estimation of the background from this source then becomes a crucial task for designing future large-scale detectors. Radioactive background event rates from some detector components (such as copper and stainless steel), as well as from rock and concrete (lab walls), were estimated in this work for a hypothetical cryogenic dark matter detector (for instance EURECA) with a target mass of 100-1000 kg. Different shielding configurations (water, lead, polyethylene, plexiglass) were considered. Neutrons and photons were propagated to the detector using GEANT4. Some requirements for the radio-purity of the materials were deduced from the results of these simulations. Thickness of shielding in different configurations and the required gamma discrimination factor were investigated. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：70 / 79
页数：10
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