Measurement of the neutron flux in the CPL underground laboratory and simulation studies of neutron shielding for WIMP searches

H. J. Kim, I. S. Hahn, M. J. Hwang, R. K. Jain, U. K. Kang, S. C. Kim, S. K. Kim, T. Y. Kim, Y. D. Kim, Youngjoon Kwon, H. S. Lee, J. H. Lee, J. I. Lee, M. H. Lee, D. S. Lim, S. H. Noh, H. Park, I. H. Park, E. S. Seo, E. Won & 2 others M. S. Yang, I. Yu

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Searches for weakly interacting massive particles (WIMPs) can be carried out based on the detection of nuclear recoil energy in CsI(Tℓ) crystals. It is crucial to minimize the neutron background as well as to fully understand the remaining background sources through adequate shielding when using the pulse shape discrimination method for WIMP detection. We have measured the neutron flux at 350 m minimum depth, where the CheongPyung underground laboratory (CPL) is located, to be 3.00±0.02 (stat.)± 0.05 (syst.)×10-5 neutrons/cm2/s with the neutron energy in the range 1.5<En<6 MeV. Using the GEANT4 simulation,have demonstrated that the neutron flux can be reduced sufficiently for dark matter searches with 30 cm of polyethylene passive shield and 20 cm of BC501A liquid scintillator active shield. The neutron induced background at a few keV energy deposit in CsI crystal is less than 0.001 counts/keV/kg/day. An active shield not only reduces the neutron background but can also reduce the uncertainty in the neutron background estimation.

Original languageEnglish
Pages (from-to)549-557
Number of pages9
JournalAstroparticle Physics
Volume20
Issue number5
DOIs
Publication statusPublished - 2004 Feb 1

Fingerprint

weakly interacting massive particles
flux (rate)
shielding
neutrons
simulation
scintillation counters
crystals
discrimination
energy
polyethylenes
dark matter
deposits
liquids
pulses

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

Kim, H. J. ; Hahn, I. S. ; Hwang, M. J. ; Jain, R. K. ; Kang, U. K. ; Kim, S. C. ; Kim, S. K. ; Kim, T. Y. ; Kim, Y. D. ; Kwon, Youngjoon ; Lee, H. S. ; Lee, J. H. ; Lee, J. I. ; Lee, M. H. ; Lim, D. S. ; Noh, S. H. ; Park, H. ; Park, I. H. ; Seo, E. S. ; Won, E. ; Yang, M. S. ; Yu, I. / Measurement of the neutron flux in the CPL underground laboratory and simulation studies of neutron shielding for WIMP searches. In: Astroparticle Physics. 2004 ; Vol. 20, No. 5. pp. 549-557.
@article{25f5f5be30e14e8ab99e0759c9e69abe,
title = "Measurement of the neutron flux in the CPL underground laboratory and simulation studies of neutron shielding for WIMP searches",
abstract = "Searches for weakly interacting massive particles (WIMPs) can be carried out based on the detection of nuclear recoil energy in CsI(Tℓ) crystals. It is crucial to minimize the neutron background as well as to fully understand the remaining background sources through adequate shielding when using the pulse shape discrimination method for WIMP detection. We have measured the neutron flux at 350 m minimum depth, where the CheongPyung underground laboratory (CPL) is located, to be 3.00±0.02 (stat.)± 0.05 (syst.)×10-5 neutrons/cm2/s with the neutron energy in the range 1.5<En<6 MeV. Using the GEANT4 simulation,have demonstrated that the neutron flux can be reduced sufficiently for dark matter searches with 30 cm of polyethylene passive shield and 20 cm of BC501A liquid scintillator active shield. The neutron induced background at a few keV energy deposit in CsI crystal is less than 0.001 counts/keV/kg/day. An active shield not only reduces the neutron background but can also reduce the uncertainty in the neutron background estimation.",
author = "Kim, {H. J.} and Hahn, {I. S.} and Hwang, {M. J.} and Jain, {R. K.} and Kang, {U. K.} and Kim, {S. C.} and Kim, {S. K.} and Kim, {T. Y.} and Kim, {Y. D.} and Youngjoon Kwon and Lee, {H. S.} and Lee, {J. H.} and Lee, {J. I.} and Lee, {M. H.} and Lim, {D. S.} and Noh, {S. H.} and H. Park and Park, {I. H.} and Seo, {E. S.} and E. Won and Yang, {M. S.} and I. Yu",
year = "2004",
month = "2",
day = "1",
doi = "10.1016/j.astropartphys.2003.09.001",
language = "English",
volume = "20",
pages = "549--557",
journal = "Astroparticle Physics",
issn = "0927-6505",
publisher = "Elsevier",
number = "5",

}

Kim, HJ, Hahn, IS, Hwang, MJ, Jain, RK, Kang, UK, Kim, SC, Kim, SK, Kim, TY, Kim, YD, Kwon, Y, Lee, HS, Lee, JH, Lee, JI, Lee, MH, Lim, DS, Noh, SH, Park, H, Park, IH, Seo, ES, Won, E, Yang, MS & Yu, I 2004, 'Measurement of the neutron flux in the CPL underground laboratory and simulation studies of neutron shielding for WIMP searches', Astroparticle Physics, vol. 20, no. 5, pp. 549-557. https://doi.org/10.1016/j.astropartphys.2003.09.001

Measurement of the neutron flux in the CPL underground laboratory and simulation studies of neutron shielding for WIMP searches. / Kim, H. J.; Hahn, I. S.; Hwang, M. J.; Jain, R. K.; Kang, U. K.; Kim, S. C.; Kim, S. K.; Kim, T. Y.; Kim, Y. D.; Kwon, Youngjoon; Lee, H. S.; Lee, J. H.; Lee, J. I.; Lee, M. H.; Lim, D. S.; Noh, S. H.; Park, H.; Park, I. H.; Seo, E. S.; Won, E.; Yang, M. S.; Yu, I.

In: Astroparticle Physics, Vol. 20, No. 5, 01.02.2004, p. 549-557.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurement of the neutron flux in the CPL underground laboratory and simulation studies of neutron shielding for WIMP searches

AU - Kim, H. J.

AU - Hahn, I. S.

AU - Hwang, M. J.

AU - Jain, R. K.

AU - Kang, U. K.

AU - Kim, S. C.

AU - Kim, S. K.

AU - Kim, T. Y.

AU - Kim, Y. D.

AU - Kwon, Youngjoon

AU - Lee, H. S.

AU - Lee, J. H.

AU - Lee, J. I.

AU - Lee, M. H.

AU - Lim, D. S.

AU - Noh, S. H.

AU - Park, H.

AU - Park, I. H.

AU - Seo, E. S.

AU - Won, E.

AU - Yang, M. S.

AU - Yu, I.

PY - 2004/2/1

Y1 - 2004/2/1

N2 - Searches for weakly interacting massive particles (WIMPs) can be carried out based on the detection of nuclear recoil energy in CsI(Tℓ) crystals. It is crucial to minimize the neutron background as well as to fully understand the remaining background sources through adequate shielding when using the pulse shape discrimination method for WIMP detection. We have measured the neutron flux at 350 m minimum depth, where the CheongPyung underground laboratory (CPL) is located, to be 3.00±0.02 (stat.)± 0.05 (syst.)×10-5 neutrons/cm2/s with the neutron energy in the range 1.5<En<6 MeV. Using the GEANT4 simulation,have demonstrated that the neutron flux can be reduced sufficiently for dark matter searches with 30 cm of polyethylene passive shield and 20 cm of BC501A liquid scintillator active shield. The neutron induced background at a few keV energy deposit in CsI crystal is less than 0.001 counts/keV/kg/day. An active shield not only reduces the neutron background but can also reduce the uncertainty in the neutron background estimation.

AB - Searches for weakly interacting massive particles (WIMPs) can be carried out based on the detection of nuclear recoil energy in CsI(Tℓ) crystals. It is crucial to minimize the neutron background as well as to fully understand the remaining background sources through adequate shielding when using the pulse shape discrimination method for WIMP detection. We have measured the neutron flux at 350 m minimum depth, where the CheongPyung underground laboratory (CPL) is located, to be 3.00±0.02 (stat.)± 0.05 (syst.)×10-5 neutrons/cm2/s with the neutron energy in the range 1.5<En<6 MeV. Using the GEANT4 simulation,have demonstrated that the neutron flux can be reduced sufficiently for dark matter searches with 30 cm of polyethylene passive shield and 20 cm of BC501A liquid scintillator active shield. The neutron induced background at a few keV energy deposit in CsI crystal is less than 0.001 counts/keV/kg/day. An active shield not only reduces the neutron background but can also reduce the uncertainty in the neutron background estimation.

UR - http://www.scopus.com/inward/record.url?scp=0347759818&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0347759818&partnerID=8YFLogxK

U2 - 10.1016/j.astropartphys.2003.09.001

DO - 10.1016/j.astropartphys.2003.09.001

M3 - Article

VL - 20

SP - 549

EP - 557

JO - Astroparticle Physics

JF - Astroparticle Physics

SN - 0927-6505

IS - 5

ER -