Understanding internal backgrounds in 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

doi:10.1140/epjc/s10052-016-4030-z

Understanding internal backgrounds in 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. LiS. Y. Oh, S. L. Olsen, H. K. Park, H. S. Park, K. S. Park, J. H. So, Y. S. Yoon

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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. Building on experience accumulated during 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 annual modulation signature. Measurements of six prototype crystals show progress in the reduction of internal contamination from 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 (Formula presented.) test of the DAMA/LIBRA signature would be possible with a 600 kg year exposure with this system.

Original language	English
Article number	185
Journal	European Physical Journal C
Volume	76
Issue number	4
DOIs	https://doi.org/10.1140/epjc/s10052-016-4030-z
State	Published - 1 Apr 2016

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Adhikari, P., Adhikari, G., Choi, S., Ha, C., Hahn, I. S., Jeon, E. J., Joo, H. W., Kang, W. G., Kim, H. J., Kim, H. O., Kim, K. W., Kim, N. Y., Kim, S. K., Kim, Y. D., Kim, Y. H., Lee, H. S., Lee, J. H., Lee, M. H., Leonard, D. S., ... Yoon, Y. S. (2016). Understanding internal backgrounds in NaI(Tl) crystals toward a 200 kg array for the KIMS-NaI experiment. European Physical Journal C, 76(4), Article 185. https://doi.org/10.1140/epjc/s10052-016-4030-z

@article{5d44dac4067d4ddbbf0c9107d7a0a3e3,

title = "Understanding internal backgrounds in NaI(Tl) crystals toward a 200 kg array for the KIMS-NaI experiment",

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. Building on experience accumulated during 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 annual modulation signature. Measurements of six prototype crystals show progress in the reduction of internal contamination from 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 (Formula presented.) test of the DAMA/LIBRA signature would be possible with a 600 kg year exposure with this system.",

author = "P. Adhikari and G. Adhikari and S. Choi and C. Ha and Hahn, {I. S.} and Jeon, {E. J.} and Joo, {H. W.} and Kang, {W. G.} and Kim, {H. J.} and Kim, {H. O.} and Kim, {K. W.} and Kim, {N. Y.} and Kim, {S. K.} and Kim, {Y. D.} and Kim, {Y. H.} and Lee, {H. S.} and Lee, {J. H.} and Lee, {M. H.} and Leonard, {D. S.} and J. Li and Oh, {S. Y.} and Olsen, {S. L.} and Park, {H. K.} and Park, {H. S.} and Park, {K. S.} and So, {J. H.} and Yoon, {Y. S.}",

note = "Publisher Copyright: {\textcopyright} 2016, The Author(s).",

year = "2016",

month = apr,

day = "1",

doi = "10.1140/epjc/s10052-016-4030-z",

language = "English",

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journal = "European Physical Journal C",

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Adhikari, P, Adhikari, G, Choi, S, Ha, C, Hahn, IS, Jeon, EJ, Joo, HW, Kang, WG, Kim, HJ, Kim, HO, Kim, KW, Kim, NY, Kim, SK, Kim, YD, Kim, YH, Lee, HS, Lee, JH, Lee, MH, Leonard, DS, Li, J, Oh, SY, Olsen, SL, Park, HK, Park, HS, Park, KS, So, JH & Yoon, YS 2016, 'Understanding internal backgrounds in NaI(Tl) crystals toward a 200 kg array for the KIMS-NaI experiment', European Physical Journal C, vol. 76, no. 4, 185. https://doi.org/10.1140/epjc/s10052-016-4030-z

TY - JOUR

T1 - Understanding internal backgrounds in NaI(Tl) crystals toward a 200 kg array for the KIMS-NaI experiment

AU - Adhikari, P.

AU - Adhikari, G.

AU - Choi, S.

AU - Ha, C.

AU - Hahn, I. S.

AU - Jeon, E. J.

AU - Joo, H. W.

AU - Kang, W. G.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, K. W.

AU - Kim, N. Y.

AU - Kim, S. K.

AU - Kim, Y. D.

AU - Kim, Y. H.

AU - Lee, H. S.

AU - Lee, J. H.

AU - Lee, M. H.

AU - Leonard, D. S.

AU - Li, J.

AU - Oh, S. Y.

AU - Olsen, S. L.

AU - Park, H. K.

AU - Park, H. S.

AU - Park, K. S.

AU - So, J. H.

AU - Yoon, Y. S.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - 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. Building on experience accumulated during 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 annual modulation signature. Measurements of six prototype crystals show progress in the reduction of internal contamination from 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 (Formula presented.) test of the DAMA/LIBRA signature would be possible with a 600 kg year exposure with this system.

AB - 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. Building on experience accumulated during 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 annual modulation signature. Measurements of six prototype crystals show progress in the reduction of internal contamination from 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 (Formula presented.) test of the DAMA/LIBRA signature would be possible with a 600 kg year exposure with this system.

UR - http://www.scopus.com/inward/record.url?scp=84962910996&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-016-4030-z

DO - 10.1140/epjc/s10052-016-4030-z

M3 - Article

AN - SCOPUS:84962910996

SN - 1434-6044

VL - 76

JO - European Physical Journal C

JF - European Physical Journal C

IS - 4

M1 - 185

ER -

Understanding internal backgrounds in NaI(Tl) crystals toward a 200 kg array for the KIMS-NaI experiment

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