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1、AS-TEXONO/01-04July11,2018NuclearRecoilMeasurementinCsI(Tl)CrystalforColdDarkMatterDetectionM.Z.Wanga,Q.Yueb,J.R.Dengc,W.P.Laid,e,H.B.Lia,d,J.Lib,Y.Liub,B.J.Qic,X.C.Ruanc,C.H.Tanga,H.Q.Tangc,H.T.Wongd,∗,S.C.Wua,B.Xinc,Z.Y.ZhoucaDepartmentofPhysics,NationalTai
2、wanUniversity,Taipei,Taiwan.bInstituteofHighEnergyPhysics,Beijing,China.cDepartmentofNuclearPhysics,InstituteofAtomicEnergy,Beijing,ChinadInstituteofPhysics,AcademiaSinica,Taipei,Taiwan.eDepartmentofManagementInformationSystems,ChungKuoInstituteofTechnology,T
3、aipei,Taiwan.arXiv:nucl-ex/0110003v415Jan2002∗Correspondingauthor:Email:htwong@phys.sinica.edu.tw;Tel:+886-2-2789-9682;FAX:+886-2-2788-9828.1AbstractTherearerecentinterestswithCsI(Tl)scintillatingcrystalsforDarkMatterexperiments.Thescatteringsignaturesbyneutr
4、onsonaCsI(Tl)detectorwerestudiedusinganeutronbeamgeneratedbya13MVTandemaccelerator.Theenergyspectraofnuclearrecoilsfrom7keVto132keVweremeasured,andtheirquenchingfactorsforscintillatinglightyieldwerederived.ThedatarepresentsthefirstconfirmationoftheOpticalModelp
5、redictionsonneutronelasticscatteringswithadirectmeasurementonthenuclearrecoilsofheavynuclei.Thepulseshapediscriminationtechniquestodifferentiatenuclearrecoilsfromγ-backgroundwerestudied.Internalconsistencieswereobtainedamongthedifferentmethodsoflightyieldmeasur
6、ements.TheprojectedcapabilitiesforColdDarkMattersearcheswithCsI(Tl)crystalsarepresented.PACSCodes:25.40.Dn,95.35.+d,29.40.Mc.Keywords:Neutronelasticscattering,Darkmatter,Scintillationdetectors.21IntroductionThedetectionofDarkMatterandthestudiesoftheirproperti
7、es[1]areoffundamentalimportanceinparticlephysicsandcosmology.TheWeaklyInteractingMassiveParticles(WIMPs)aregoodcandidatesfor“Cold”DarkMatter,andtheirexperimentalsearcheshavegatheredalotofinterestsinrecentyears.Themostpromisingavenueistodetectthenuclearrecoils
8、ignaturesduetoelasticscatteringsofWIMPsonthetargetisotopes.Thetypicalenergydepositionsareonlyoftheorderof10keV,imposingbigexperimentalchallengesintermsofthedetectionofweaksignalsaswellasb
