Background modeling for dark matter search with 1.7 years of COSINE-100 data

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Abstract

We present a background model for dark matter searches using an array of NaI(Tl) crystals in the COSINE-100 experiment that is located in the Yangyang underground laboratory. The model includes background contributions from both internal and external sources, including cosmogenic radionuclides and surface 210Pb contamination. To build the model in the low energy region, with a threshold of 1 keV, we used a depth profile of 210Pb contamination in the surface of the NaI(Tl) crystals determined in a comparison between measured and simulated spectra. We also considered the effect of the energy scale errors propagated from the statistical uncertainties and the nonlinear detector response at low energies. The 1.7 years COSINE-100 data taken between October 21, 2016 and July 18, 2018 were used for this analysis. Our Monte Carlo simulation provides a non-Gaussian peak around 50 keV originating from beta decays of bulk 210Pb in a good agreement with the measured background. This model estimates that the activities of bulk 210Pb and 3H are dominating the background rate that amounts to an average level of 2.85±0.15 counts/day/keV/kg in the energy region of (1–6) keV, using COSINE-100 data with a total exposure of 97.7 kg⋅years.

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Item Type:	Article
Authors/Creators:	Adhikari, G de Souza, EB Carlin, N Choi, JJ Choi, S Djamal, M Ezeribe, AC França, LE Ha, C Hahn, IS Jeon, EJ Jo, JH Joo, HW Kang, WG Kauer, M Kim, H Kim, HJ Kim, KW Kim, SH Kim, SK Kim, WK Kim, YD Kim, YH Ko, YJ Lee, EK Lee, H Lee, HS Lee, HY Lee, IS Lee, J Lee, JY Lee, MH Lee, SH Lee, SM Leonard, DS Lynch, WA Manzato, BB Maruyama, RH Neal, RJ Olsen, SL Park, BJ Park, HK Park, HS Park, KS Pitta, RLC Prihtiadi, H Ra, SJ Rott, C Shin, KA Scarff, A Spooner, NJC Thompson, WG Yang, L Yu, GH
Copyright, Publisher and Additional Information:	© The Author(s) 2021. Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: September 2021 Published (online): 21 September 2021 Accepted: 19 August 2021
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Funding Information:	Funder Grant number SCIENCE AND TECHNOLOGY FACILITIES COUNCIL ST/K001337/1 Science and Technology Facilities Council ST/N000277/1 SCIENCE AND TECHNOLOGY FACILITIES COUNCIL ST/N000277/1
Depositing User:	Symplectic Sheffield
Date Deposited:	06 Oct 2021 10:09
Last Modified:	23 Oct 2022 22:10
Status:	Published
Publisher:	Springer Science and Business Media LLC
Refereed:	Yes
Identification Number:	10.1140/epjc/s10052-021-09564-0
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:178793

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Background modeling for dark matter search with 1.7 years of COSINE-100 data. (deposited 23 Oct 2022 22:09)
- Background modeling for dark matter search with 1.7 years of COSINE-100 data. (deposited 06 Oct 2021 10:09) [Currently Displayed]

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Background modeling for dark matter search with 1.7 years of COSINE-100 data

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