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Depth profile study of Pb-210 in the surface of an NaI(Tl) crystal

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dc.contributor.authorG.H. Yu-
dc.contributor.authorChang Hyon Ha-
dc.contributor.authorEun Ju Jeon-
dc.contributor.authorKyungwon Kim-
dc.contributor.authorNam Young Kim-
dc.contributor.authorYeongduk Kim-
dc.contributor.authorHyun Su Lee-
dc.contributor.authorHyangkyu Park-
dc.contributor.authorC. Rott-
dc.date.accessioned2020-12-22T02:20:25Z-
dc.date.accessioned2020-12-22T02:20:25Z-
dc.date.available2020-12-22T02:20:25Z-
dc.date.available2020-12-22T02:20:25Z-
dc.date.created2020-11-09-
dc.date.issued2021-03-
dc.identifier.issn0927-6505-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/7495-
dc.description.abstractThe surface Pb-210 is one of the main background sources for dark-matter-search experiments using NaI(Tl) crystals, and its spectral features associated with the beta-decay events for energies less than 60 keV depends on the depth distribution of Pb-210 in the surface of an NaI(Tl) crystal. Therefore, we must understand the profile of surface Pb-210 to precisely model the background measurement in the low-energy region for the low-background experiment using NaI(Tl) crystals. We estimate the depth profile of the surface Pb-210 contamination by modeling the measured spectrum of the alpha emission from the decay of Po-210 at the decay sequence of the surface Pb-210 contamination that is obtained using an Rn-222-contaminated crystal. In order to describe the energy spectra of the surface contamination we perform a log-likelihood fit of the measured data to a sum of Geant4 Mote Carlo simulations, weighted by an exponential curve as a function of the surface depth. The lowand high-energy events from the beta decay of surface Pb-210 are also modeled to improve the depth profile for shallow depths. We simulate the energy spectra from beta decays of Pb-210 that are exponentially distributed in the surface by following two exponential functions where the mean-depth coefficients are free parameters in the data fitting; we observed that the energy spectra are in good agreement with the measured data. (C) 2020 Elsevier B.V. All rights reserved.-
dc.language영어-
dc.publisherELSEVIER-
dc.titleDepth profile study of Pb-210 in the surface of an NaI(Tl) crystal-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000600571200002-
dc.identifier.scopusid2-s2.0-85092031142-
dc.identifier.rimsid73301-
dc.contributor.affiliatedAuthorChang Hyon Ha-
dc.contributor.affiliatedAuthorEun Ju Jeon-
dc.contributor.affiliatedAuthorKyungwon Kim-
dc.contributor.affiliatedAuthorNam Young Kim-
dc.contributor.affiliatedAuthorYeongduk Kim-
dc.contributor.affiliatedAuthorHyun Su Lee-
dc.identifier.doi10.1016/j.astropartphys.2020.102518-
dc.identifier.bibliographicCitationASTROPARTICLE PHYSICS, v.126-
dc.relation.isPartOfASTROPARTICLE PHYSICS-
dc.citation.titleASTROPARTICLE PHYSICS-
dc.citation.volume126-
dc.description.journalClass1-
dc.description.journalClass1-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.relation.journalWebOfScienceCategoryAstronomy & Astrophysics-
dc.relation.journalWebOfScienceCategoryPhysics, Particles & Fields-
dc.subject.keywordPlusANOMALOUS PULSES-
dc.subject.keywordPlusDAMA/LIBRA-
dc.subject.keywordPlusMODEL-
dc.subject.keywordAuthorSurface contamination-
dc.subject.keywordAuthorDepth profile-
dc.subject.keywordAuthor(210) Pb-
dc.subject.keywordAuthor(210) Po-
dc.subject.keywordAuthorNaI(Tl) crystal-
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
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