Assessment of backgrounds of the ANAIS experiment for dark matter direct detection

被引：38
|
作者：
Amare, J. [1 ,2 ]
Cebrian, S. [1 ,2 ]
Cuesta, C. [1 ,2 ,3 ]
Garcia, E. [1 ,2 ]
Martinez, M. [1 ,2 ,4 ]
Olivan, M. A. [1 ,2 ]
Ortigoza, Y. [1 ,2 ]
Ortiz de Solorzano, A. [1 ,2 ]
Puimedon, J. [1 ,2 ]
Sarsa, M. L. [1 ,2 ]
Villar, J. A. [1 ,2 ]
Villar, P. [1 ,2 ]
机构：
[1] Univ Zaragoza, Lab Fis Nucl & Astroparticulas, Calle Pedro Cerbuna 12, E-50009 Zaragoza, Spain
[2] Canfranc Estn, Lab Subterraneo Canfranc, Paseo Ayerbe S-N, Huesca 22880, Spain
[3] Univ Washington, Dept Phys, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA
[4] Univ Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Rome, Italy
来源：
EUROPEAN PHYSICAL JOURNAL C | 2016年 / 76卷 / 08期
关键词：
RADIOACTIVITY BACKGROUNDS; ANNUAL MODULATION; ANOMALOUS PULSES; NAI(TL); SCINTILLATION; SIMULATION; SEARCH; LIMITS; MODEL;
D O I：
10.1140/epjc/s10052-016-4279-2
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
A large effort has been carried out to characterize the background of sodium iodide crystals within the Annual modulation with NaI Scintillators (ANAIS) project. In this paper, the background models developed for three 12.5 kg NaI(Tl) scintillators produced by Alpha Spectra Inc. and operated at the Canfranc Underground Laboratory are presented together with an evaluation of the background prospects for the full experiment. Measured spectra from threshold to high energy in different conditions are well described by the models based on quantified activities. At the region of interest, crystal bulk contamination is the dominant background source. Contributions from Pb-210, K-40, Na-22 and H-3 are the most relevant. Those from K-40 and Na-22 could be efficiently suppressed thanks to anticoincidence operation in a crystals matrix or inside a liquid scintillator veto (LSV), while that from Pb-210 has been reduced by improving crystal production methods and H-3 production could be reduced by shielding against cosmic rays during production. Assuming the activities of the last characterized detector, for nine crystals with a total mass of 112.5 kg the expected background rate is 2.5 counts/(keV kg day) in the region from 1 to 4 keV, which could be reduced at 1.4 counts/(keV kg day) by using a LSV.
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页数：15
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