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 language | English |
|---|---|
| Article number | 4545135 |
| Pages (from-to) | 1420-1424 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 55 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2008 Jun 1 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering
Cite this
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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, Youngjoon; 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 journal › Article
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, Youngjoon
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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U2 - 10.1109/TNS.2008.921930
DO - 10.1109/TNS.2008.921930
M3 - Article
VL - 55
SP - 1420
EP - 1424
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 3
M1 - 4545135
ER -