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Understanding NaI(Tl) crystal background for dark matter searches

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Title
Understanding NaI(Tl) crystal background for dark matter searches
Author(s)
Adhikari, G; Adhikari, P; Ha, C; Jeon, EJ; Kim, NY; Kim, YD; Kong, SY; Lee, HS; Oh, SY; Park, JS; Park, KS
Publication Date
2017-07
Journal
EUROPEAN PHYSICAL JOURNAL C, v.77, no.7, pp.437 -
Publisher
SPRINGER
Abstract
We have developed ultra-low-background NaI(Tl) crystals to reproduce the DAMA results with the ultimate goal of achieving purity levels that are comparable to or better than those of the DAMA/LIBRA crystals. Even though the achieved background level does not approach that of DAMA/LIBRA, it is crucial to have a quantitative understanding of the backgrounds. We have studied background simulations toward a deeper understanding of the backgrounds and developed background models for a 9.16-kg NaI(Tl) crystal used in the test arrangement. In this paper we describe the contributions of background sources quantitatively by performing Geant4 Monte Carlo simulations that are fitted to the measured data to quantify the unknown fractions of the background compositions. In the fitted results, the overall simulated background spectrum well describes the measured data with a 9.16-kg NaI(Tl) crystal and shows that the background sources are dominated by surface Pb-210 and internal K-40 in the 2-6-keV energy interval, which produce 2.4 counts/day/keV/kg (dru) and 0.5 dru, respectively. © The Author(s) 2017. This article is an open access publication
URI
http://pr.ibs.re.kr/handle/8788114/4797
DOI
10.1140/epjc/s10052-017-5011-6
ISSN
1434-6044
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > Journal Papers (저널논문)
Files in This Item:
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