Development of low background CsI(Tl) crystals and search for WIMP

H. J. Kim, H. S. Lee, H. C. Bhang, J. H. Choi, H. Dao, I. S. Hahn, M. J. Hwang, S. W. Jung, W. G. Kang, D. W. Kim, S. C. Kim, S. K. Kim, T. Y. Kim, Y. D. Kim, J. W. Kwak, Y. J. Kwon, J. Lee, J. H. Lee, J. I. Lee, M. J. LeeM. H. Lee, J. Li, X. Li, S. S. Myung, S. Ryu, J. H. So, J. J. Zhu

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Abstract

The response of CsI(Tl) crystals to nuclear recoils and γs down to 3 keV has been studied, and it has been demonstrated that the pulse shape discrimination capability for CsI(Tl) is better than that for NaI(Tl). Extensive study of internal background of CsI powder was performed and a lot of efforts have been made to reduce the internal background sources such as137Cs and 87Rb. The 137Cs concentration of 2 mBq/kg was achieved successfully in the CsI powder using ultra-pure water for whole extraction process. The Rb concentration was successfully reduced to be less than 1 ppb by the recrystallization method. The CsI(Tl) crystal used for the experiment was grown with the ultra-low background CsI powder and a dimension of the CsI(Tl) crystal is 8 × 8 × 30 cm3 which corresponds to weight of 8.7 kg. The number of photoelectrons is measured to be about 4-6/keV with a RbCs photocathode PMT. The background of CsI(Tl) crystals were measured in the shielding of 30 cm thick mineral oil, 15 cm thick lead, 5 cm thick polyethylene and 10 cm copper at the 700 m minimum depth of underground laboratory at Yang Yang Pumped Storage Power Plant in Korea. The WIMP search with low background CsI(Tl) crystals has been carried out by the Korean Invisible Mass Search (KIMS) Collaboration and the lower limit on WIMP-nucleon cross section are reported.

Original languageEnglish
Article number4545135
Pages (from-to)1420-1424
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume55
Issue number3
DOIs
Publication statusPublished - 2008 Jun 1

Fingerprint

weakly interacting massive particles
Crystals
crystals
Powders
Pumped storage power plants
mineral oils
Photocathodes
Korea
Mineral oils
photocathodes
power plants
Photoelectrons
Shielding
shielding
discrimination
Polyethylenes
polyethylenes
photoelectrons
Lead
Copper

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

Cite this

Kim, H. J., Lee, H. S., Bhang, H. C., Choi, J. H., Dao, H., Hahn, I. S., ... Zhu, J. J. (2008). Development of low background CsI(Tl) crystals and search for WIMP. IEEE Transactions on Nuclear Science, 55(3), 1420-1424. [4545135]. https://doi.org/10.1109/TNS.2008.921930
Kim, H. J. ; Lee, H. S. ; Bhang, H. C. ; Choi, J. H. ; Dao, H. ; Hahn, I. S. ; Hwang, M. J. ; Jung, S. W. ; Kang, W. G. ; Kim, D. W. ; Kim, S. C. ; Kim, S. K. ; Kim, T. Y. ; Kim, Y. D. ; Kwak, J. W. ; Kwon, Y. J. ; Lee, J. ; Lee, J. H. ; Lee, J. I. ; Lee, M. J. ; Lee, M. H. ; Li, J. ; Li, X. ; Myung, S. S. ; Ryu, S. ; So, J. H. ; Zhu, J. J. / Development of low background CsI(Tl) crystals and search for WIMP. In: IEEE Transactions on Nuclear Science. 2008 ; Vol. 55, No. 3. pp. 1420-1424.
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abstract = "The response of CsI(Tl) crystals to nuclear recoils and γs down to 3 keV has been studied, and it has been demonstrated that the pulse shape discrimination capability for CsI(Tl) is better than that for NaI(Tl). Extensive study of internal background of CsI powder was performed and a lot of efforts have been made to reduce the internal background sources such as137Cs and 87Rb. The 137Cs concentration of 2 mBq/kg was achieved successfully in the CsI powder using ultra-pure water for whole extraction process. The Rb concentration was successfully reduced to be less than 1 ppb by the recrystallization method. The CsI(Tl) crystal used for the experiment was grown with the ultra-low background CsI powder and a dimension of the CsI(Tl) crystal is 8 × 8 × 30 cm3 which corresponds to weight of 8.7 kg. The number of photoelectrons is measured to be about 4-6/keV with a RbCs photocathode PMT. The background of CsI(Tl) crystals were measured in the shielding of 30 cm thick mineral oil, 15 cm thick lead, 5 cm thick polyethylene and 10 cm copper at the 700 m minimum depth of underground laboratory at Yang Yang Pumped Storage Power Plant in Korea. The WIMP search with low background CsI(Tl) crystals has been carried out by the Korean Invisible Mass Search (KIMS) Collaboration and the lower limit on WIMP-nucleon cross section are reported.",
author = "Kim, {H. J.} and Lee, {H. S.} and Bhang, {H. C.} and Choi, {J. H.} and H. Dao and Hahn, {I. S.} and Hwang, {M. J.} and Jung, {S. W.} and Kang, {W. G.} and Kim, {D. W.} and Kim, {S. C.} and Kim, {S. K.} and Kim, {T. Y.} and Kim, {Y. D.} and Kwak, {J. W.} and Kwon, {Y. J.} and J. Lee and Lee, {J. H.} and Lee, {J. I.} and Lee, {M. J.} and Lee, {M. H.} and J. Li and X. Li and Myung, {S. S.} and S. Ryu and So, {J. H.} and Zhu, {J. J.}",
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Kim, HJ, Lee, HS, Bhang, HC, Choi, JH, Dao, H, Hahn, IS, Hwang, MJ, Jung, SW, Kang, WG, Kim, DW, Kim, SC, Kim, SK, Kim, TY, Kim, YD, Kwak, JW, Kwon, YJ, Lee, J, Lee, JH, Lee, JI, Lee, MJ, Lee, MH, Li, J, Li, X, Myung, SS, Ryu, S, So, JH & Zhu, JJ 2008, 'Development of low background CsI(Tl) crystals and search for WIMP', IEEE Transactions on Nuclear Science, vol. 55, no. 3, 4545135, pp. 1420-1424. https://doi.org/10.1109/TNS.2008.921930

Development of low background CsI(Tl) crystals and search for WIMP. / Kim, H. J.; Lee, H. S.; Bhang, H. C.; Choi, J. H.; Dao, H.; Hahn, I. S.; Hwang, M. J.; Jung, S. W.; Kang, W. G.; Kim, D. W.; Kim, S. C.; Kim, S. K.; Kim, T. Y.; Kim, Y. D.; Kwak, J. W.; Kwon, Y. J.; Lee, J.; Lee, J. H.; Lee, J. I.; Lee, M. J.; Lee, M. H.; Li, J.; Li, X.; Myung, S. S.; Ryu, S.; So, J. H.; Zhu, J. J.

In: IEEE Transactions on Nuclear Science, Vol. 55, No. 3, 4545135, 01.06.2008, p. 1420-1424.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Development of low background CsI(Tl) crystals and search for WIMP

AU - Kim, H. J.

AU - Lee, H. S.

AU - Bhang, H. C.

AU - Choi, J. H.

AU - Dao, H.

AU - Hahn, I. S.

AU - Hwang, M. J.

AU - Jung, S. W.

AU - Kang, W. G.

AU - Kim, D. W.

AU - Kim, S. C.

AU - Kim, S. K.

AU - Kim, T. Y.

AU - Kim, Y. D.

AU - Kwak, J. W.

AU - Kwon, Y. J.

AU - Lee, J.

AU - Lee, J. H.

AU - Lee, J. I.

AU - Lee, M. J.

AU - Lee, M. H.

AU - Li, J.

AU - Li, X.

AU - Myung, S. S.

AU - Ryu, S.

AU - So, J. H.

AU - Zhu, J. J.

PY - 2008/6/1

Y1 - 2008/6/1

N2 - The response of CsI(Tl) crystals to nuclear recoils and γs down to 3 keV has been studied, and it has been demonstrated that the pulse shape discrimination capability for CsI(Tl) is better than that for NaI(Tl). Extensive study of internal background of CsI powder was performed and a lot of efforts have been made to reduce the internal background sources such as137Cs and 87Rb. The 137Cs concentration of 2 mBq/kg was achieved successfully in the CsI powder using ultra-pure water for whole extraction process. The Rb concentration was successfully reduced to be less than 1 ppb by the recrystallization method. The CsI(Tl) crystal used for the experiment was grown with the ultra-low background CsI powder and a dimension of the CsI(Tl) crystal is 8 × 8 × 30 cm3 which corresponds to weight of 8.7 kg. The number of photoelectrons is measured to be about 4-6/keV with a RbCs photocathode PMT. The background of CsI(Tl) crystals were measured in the shielding of 30 cm thick mineral oil, 15 cm thick lead, 5 cm thick polyethylene and 10 cm copper at the 700 m minimum depth of underground laboratory at Yang Yang Pumped Storage Power Plant in Korea. The WIMP search with low background CsI(Tl) crystals has been carried out by the Korean Invisible Mass Search (KIMS) Collaboration and the lower limit on WIMP-nucleon cross section are reported.

AB - The response of CsI(Tl) crystals to nuclear recoils and γs down to 3 keV has been studied, and it has been demonstrated that the pulse shape discrimination capability for CsI(Tl) is better than that for NaI(Tl). Extensive study of internal background of CsI powder was performed and a lot of efforts have been made to reduce the internal background sources such as137Cs and 87Rb. The 137Cs concentration of 2 mBq/kg was achieved successfully in the CsI powder using ultra-pure water for whole extraction process. The Rb concentration was successfully reduced to be less than 1 ppb by the recrystallization method. The CsI(Tl) crystal used for the experiment was grown with the ultra-low background CsI powder and a dimension of the CsI(Tl) crystal is 8 × 8 × 30 cm3 which corresponds to weight of 8.7 kg. The number of photoelectrons is measured to be about 4-6/keV with a RbCs photocathode PMT. The background of CsI(Tl) crystals were measured in the shielding of 30 cm thick mineral oil, 15 cm thick lead, 5 cm thick polyethylene and 10 cm copper at the 700 m minimum depth of underground laboratory at Yang Yang Pumped Storage Power Plant in Korea. The WIMP search with low background CsI(Tl) crystals has been carried out by the Korean Invisible Mass Search (KIMS) Collaboration and the lower limit on WIMP-nucleon cross section are reported.

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Kim HJ, Lee HS, Bhang HC, Choi JH, Dao H, Hahn IS et al. Development of low background CsI(Tl) crystals and search for WIMP. IEEE Transactions on Nuclear Science. 2008 Jun 1;55(3):1420-1424. 4545135. https://doi.org/10.1109/TNS.2008.921930