The KamLAND DetectorODetectorsite:OldKamiokande site(2700m.w.e.)1,oootonLiguidScintillator80%:dodecane, 20%:pseudocumene,1.5g/liter:PPO(p=0.78)housed inspherical balloon(13mdiameter)oftransparenetnylon/EVOHcompositefilm(135um)supported by cargo net structure888888元888-88818488887C3.000m3ScintillationLightDetectorO18mdiameterstainlesssteeltankfilledwith3n08paraffin oil (p=0.04%, lighter than LS)29e9o1.32517-inch+55420-inchPMT'saphotosensitive coverage~22%Liguid SeintilatorO3mmthickacrylicwall(120plates):Rn barrierWaterCherenkovOuterDetector(3.2kton)225Kamiokande20-inchPMT'sOPresent analysisNeutrinoatDayaBay,28Nov2003
Present analysis The KamLAND Detector ~22% (3.2 kton) Neutrino at Daya Bay, 28 Nov 2003
Detecting Reactor V in Liquid Scintillatorreaction process:inverse-βdecay(Ve+p→+n)+p→d+ydistinctivetwo-step signatureprompt part :energy measurementE42.mEv~(Ee+ll+MMpDVA=Mn-Mp2.2~180usdelayedpart:(2.2MeV)Mevtagging : correlation of time,(Mn+me)2-MpEth=1.806MeVposition and energy between2Mprompt and delayed signalNeutrinoatDayaBay.28Nov2003
Detecting Reactor e in Liquid Scintillator Neutrino at Daya Bay, 28 Nov 2003
Reconstructing Position68Ge : 1.012 MeV ( +)65Zn : 1.116 MeV ()60Co : 2.506 MeV ( +)AmBe : 2.20, 4.40,7.6 MeV (y)15OAm/Be(2.2MeV)Ge±5cmZn10国Am/Be(4.4MeV)CoAm/Be(7.6MeV)A4E5OL福a0-5个N-10Fiducial0400200400600-200600z position [cm]-5m5mPosition resolution ~25 cmNeutrinoatDayaBay,28Nov2003
68Ge : 1.012 MeV ( + ) 65Zn : 1.116 MeV () 60Co : 2.506 MeV ( +) AmBe : 2.20 , 4.40, 7.6 MeV () -5m 5m Reconstructing Position Position resolution ~ 25 cm Neutrino at Daya Bay, 28 Nov 2003
Energy DeterminationGe(0.5112MeV)~8.2%Zn(1.116MeV)-7.13%Co(2.5MeV)~6.9%0.8np(2.2MeV)-7.6%nC(4.95MeV)~7.7%0.60.40.2350energy[MeV]AEsyst = 1.91% at 2.6 MeV > 2.13% for VeAE/E ~ 7.5% /JE, Light Yield ~ 300 p.e./MeVEnergy scale stable to 0.6% through out the periodNeutrinoatDayaBay,28Nov2003
Energy Determination E/E ~ 7.5% /√E , Light Yield ~ 300 p.e./MeV Energy scale stable to 0.6% through out the period Esyst = 1.91% at 2.6 MeV → 2.13% for e Neutrino at Daya Bay, 28 Nov 2003
An Anti-neutrino CandidateKanLAD Event DisplaKanLAND Event DieplatRun/SubrurvEvent:207/0/5160074Run/5ubrunvEvent207/0V5160075UT:Tue Jan107:40:01 2002UT:TueJan107:40:012002Delayed E ~ 2.22 MeVTime5ta::102787530165()TlneStanp:1027875306078Prompt E ~3.2 MeVTriteerTupe1 Oxa00/Ox2TrieserTupe1.Oxb00 Ox2TimeDiFfurenee18,7nTine Difference 1ll nicro seoHunHit/Nec/Nsun2/unHitAt596/31B/867/0HumHt/Hsun/sum2/HunHitA:.476/295/451/0Total Charge : 1.2e+03 (0)Totat Charge 1 B72(0)Hax Charge (chi: f (403)HaxCharge(ch):7.59(396)chargetimeAt~110usec△R~0.35mNeutrinoatDayaBay,28Nov2003
Prompt E ~ 3.2 MeV t ~ 110 sec Delayed E ~ 2.22 MeV R ~ 0.35 m An Anti-neutrino Candidate charge time Neutrino at Daya Bay, 28 Nov 2003