反应堆中微子实验中的光电倍增管性能研究

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1、131ò15ÏpUÔn†ØÔnVol.31,No.52007c5HIGHENERGYPHYSICSANDNUCLEARPHYSICSMay,2007StudyofEMI8"PMTsforReactorNeutrinoExperiment*1)ZHONGWei-LiLIUJin-ChangYANGChang-GenGUANMeng-YunLIZu-Hao(KeyLaboratoryofParticleAstrophysics,InstituteofHighEnergyPhysics,CAS,Beijing100049,China)AbstractThisa

2、rticleisaboutthestudyoftwokindsofEMI8"PMTs,D642KBand9350KA.Severalcharacteristicsincludingrelativequantumeciency(QE),linearity,gain,darkcurrent,afterpulseratioandincidentangleeecthavebeentested.Specially,dedicatedsystemshavebeensetupforthemeasurementsofrelativequantumeciencyand

3、incidentangleeect.TheperformancesofthetwokindsofEMIPMTsaredescribedhere.Keywordsreactorneutrinoexperiment,PMT,quantumeciency,linearity,gainanddarkcurrent,after-pulseratio,incidentangleeect1Introductioncanusethevacuumoscillationformula,butalsoisindependentofCPand23.Inreactorne

4、utrinoex-Manyneutrinoexperimentsinthelastdecadeperiments,thescintillationphotonsgeneratedbythehaveprovedthatneutrinoismassive.Itisveryin-eviainverse-decayinalargemassofliquidscin-triguingandisagreatchallengetotheStandardtillatoraredetectedbyphotomultipliers(PMTs)withModel.Amongth

5、esixparametersinneutrinoos-largecathodehousing.DayaBayisoneofthepro-cillation,,
m2[1],andj
m2j[2]havebeenposedreactorneutrinoexperimentintheworldand12212332determined,whiletheotherparameters,13,thesignlargeamountsofPMTsareneededconsequently.In2suchanexperiment,PMTsshouldbeselec

6、tedfromof
mandthephaseangleofleptonCP-violation32CP,arestillunknown.BecauseoftheimportancecandidatePMTswhichshowgoodanduniformchar-of13whichisacontrollingfactorintheleptonCP-acteristicsduringtesting.Nowtherearetwokindsofviolationmeasurement,peoplepaymoreattentiontoEMI8"PMTs(D642

7、KBand9350KA)fromMacrothemeasurementof13.TheCHOOZexperimentexperimentatIHEP.Wehavedoneaseriesofde-2[3]hasgivenanupperlimiton13:sin213<0:1.Re-tailedstudiesonseveralsamplesofthesetubesincently,moreandmoreexperimentswithhigherpre-ordertoobtainsomeexperiencesforthePMTsmasscisionarep

8、roposedtotakeotheveilof13andtes