DSpace at EWHA: Study of the internal background of CsI(Tℓ) crystal detectors for dark matter search

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Study of the internal background of CsI(Tℓ) crystal detectors for dark matter search

Title: Study of the internal background of CsI(Tℓ) crystal detectors for dark matter search

Authors: Kim T.Y.; Cho I.S.; Choi D.H.; Choi J.M.; Hahn I.S.; Hwang M.J.; Jang H.K.; Jain R.K.; Kang U.K.; Kim H.J.; Kim J.H.; Kim S.C.; Kim S.K.; Kim S.Y.; Kim Y.D.; Kwon Y.J.; Lee H.S.; Lee J.H.; Lee M.H.; Lee S.E.; Noh S.H.; Park H.; Park I.H.; Seo E.S.; Won E.; Won H.S.; Yang H.Y.; Yang M.S.; Yu I.

Journal Title: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Abstract: A search for particle cold dark matter with CsI(Tℓ) crystal is being prepared at the Cheong-Pyeong underground laboratory in Korea. The background spectra of CsI(Tℓ) crystal detectors in a prototype shield were obtained. The lowest background count rate of the test sample of crystals is measured to be 64.7±5.1 counts/keV/kg/day in the energy range of 5-20 keV. Quantitative estimation of residual radioactive isotope in CsI(Tℓ) was made using the GEANT4 Monte Carlo simulation. Analysis results show that CsI(Tℓ) crystal could be a good candidate for direct detection of WIMPs when the contamination level of cesium radioisotopes is reduced to under a few mBq/kg. © 2003 Elsevier Science B.V. All rights reserved.