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20 April 2024

» arxiv » 1510.4519

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Understanding internal backgrounds of NaI(Tl) crystals toward a 200~kg array for the KIMS-NaI experiment
P. Adhikari ; G. Adhikari ; S. Choi ; C. Ha ; I.S. Hahn ; E.J. Jeon ; H.W. Joo ; W.G. Kang ; H.J. Kim ; H.O. Kim ; K.W. Kim ; N.Y. Kim ; S.K. Kim ; Y.D. Kim ; Y.H. Kim ; H.S. Lee ; J.H. Lee ; M.H. Lee ; D.S. Leonard ; J. Li ; S.Y. Oh ; S.L. Olsen ; H.K. Park ; H.S. Park ; K.S. Park ; J.H. So ; Y.S. Yoon ;
Date:	15 Oct 2015
Abstract:	The Korea Invisible Mass Search (KIMS) collaboration has developed low-background NaI(Tl) crystals that are suitable for the direct detection of WIMP dark matter. With experience built on the KIMS-CsI programs, the KIMS-NaI experiment will consist of a 200~kg NaI(Tl) crystal array surrounded by layers of shielding structures and will be operated at the Yangyang underground laboratory. The goal is to provide an unambiguous test of the DAMA/LIBRA’s annual modulation signature. Measurements of six prototype crystals show progress in the reduction of internal contaminations of radioisotopes. Based on our understanding of these measurements, we expect to achieve a background level in the final detector configuration that is less than 1~count/day/keV/kg for recoil energies around 2~keV. The annual modulation sensitivity for the KIMS-NaI experiment shows that an unambiguous 7$sigma$ test of the DAMA/LIBRA signature would be possible with a 600~kg$cdot$year exposure with this system.
Source:	arXiv, 1510.4519
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