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Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data

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dc.contributor.authorAdhikari, P.
dc.contributor.authorAjaj, R.
dc.contributor.authorAlpizar-Venegas, M.
dc.contributor.authorAmaudruz, P. -A.
dc.contributor.authorGrobov, A.
dc.contributor.authorIlyasov, A.
dc.contributor.authorLevashko, N.
dc.contributor.authorMachulin, I.
dc.contributor.authorИльясов, Айдар Иршатович
dc.contributor.authorМачулин, Игорь Николаевич
dc.date.accessioned2024-11-29T20:45:47Z
dc.date.available2024-11-29T20:45:47Z
dc.date.issued2021
dc.description.abstract© 2021, The Author(s).The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from 39Ar beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator: the prompt-fraction, which considers the fraction of the scintillation signal in a narrow and a wide time window around the event peak, and the log-likelihood-ratio, which compares the observed photon arrival times to a signal and a background model. We furthermore use two algorithms to determine the number of photons detected at a given time: (1) simply dividing the charge of each PMT pulse by the mean single-photoelectron charge, and (2) a likelihood analysis that considers the probability to detect a certain number of photons at a given time, based on a model for the scintillation pulse shape and for afterpulsing in the light detectors. The prompt-fraction performs approximately as well as the log-likelihood-ratio PSD algorithm if the photon detection times are not biased by detector effects. We explain this result using a model for the information carried by scintillation photons as a function of the time when they are detected.
dc.identifier.citationPulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data / Adhikari, P. [et al.] // European Physical Journal C. - 2021. - 81. - № 9. - 10.1140/epjc/s10052-021-09514-w
dc.identifier.doi10.1140/epjc/s10052-021-09514-w
dc.identifier.urihttps://www.doi.org/10.1140/epjc/s10052-021-09514-w
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85115245943&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000696534900001
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/24731
dc.relation.ispartofEuropean Physical Journal C
dc.titlePulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue9
oaire.citation.volume81
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