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The European Physical Journal C

, 77:437

First Online: 01 July 2017Received: 06 March 2017Accepted: 22 June 2017

Abstract

We have developed ultra-low-background NaITl 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 NaITl 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 NaITl crystal and shows that the background sources are dominated by surface \^{210}\Pb and internal \^{40}\K in the 2–6-keV energy interval, which produce 2.4 counts-day-keV-kg dru and 0.5 dru, respectively.

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Author: G. Adhikari - P. Adhikari - C. Ha - E. J. Jeon - N. Y. Kim - Y. D. Kim - S. Y. Kong - H. S. Lee - S. Y. Oh - J. S.

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