用于COSINE - 100中碘化钠（铊）晶体的本底模型

Background model for the NaI(Tl) crystals in COSINE-100.

作者信息

Adhikari P, Adhikari G, Souza E Barbosa de, Carlin N, Choi S, Choi W Q, Djamal M, Ezeribe A C, Ha C, Hahn I S, Hubbard A J F, Jeon E J, Jo J H, Joo H W, Kang W G, Kauer M, Kang W S, Kim B H, Kim H, Kim H J, Kim K W, Kim M C, Kim N Y, Kim S K, Kim Y D, Kim Y H, Kudryavtsev V A, Lee H S, Lee J, Lee J Y, Lee M H, Leonard D S, Lynch W A, Maruyama R H, Mouton F, Olsen S L, Park H K, Park H S, Park J S, Park K S, Pettus W, Prihtiadi H, Ra S, Rott C, Scarff A, Spooner N J C, Thompson W G, Yang L, Yong S H

机构信息

1Department of Physics and Astronomy, Sejong University, Seoul, 05006 South Korea.

2Wright Laboratory, Department of Physics, Yale University, New Haven, CT 06520 USA.

出版信息

Eur Phys J C Part Fields. 2018;78(6):490. doi: 10.1140/epjc/s10052-018-5970-2. Epub 2018 Jun 12.

DOI:10.1140/epjc/s10052-018-5970-2

PMID:30956554

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6424159/

Abstract

The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds in the NaI(Tl) crystals we have performed Monte Carlo simulations using the Geant4 toolkit and developed background models for each crystal that consider contributions from both internal and external sources, including cosmogenic nuclides. The background models are based on comparisons of measurement data with Monte Carlo simulations that are guided by a campaign of material assays and are used to evaluate backgrounds and identify their sources. The average background level for the six crystals (70 kg total mass) that are studied is 3.5 counts/day/keV/kg in the (2-6) keV energy interval. The dominant contributors in this energy region are found to be Pb and H.

摘要

COSINE - 100暗物质搜索实验是一个位于杨阳地下实验室（Y2L）的碘化钠（铊）晶体探测器阵列。为了理解碘化钠（铊）晶体中测量到的本底，我们使用Geant4工具包进行了蒙特卡罗模拟，并为每个晶体开发了本底模型，该模型考虑了内部和外部来源的贡献，包括宇宙成因核素。本底模型基于测量数据与蒙特卡罗模拟的比较，这些模拟由一系列材料分析引导，并用于评估本底及其来源。所研究的六个晶体（总质量70千克）在（2 - 6）keV能量区间的平均本底水平为3.5计数/天/keV/千克。在该能量区域中，主要贡献者被发现是铅和氢。