i v sx xi sxy ygsvvesyx pyw RHHEhe heeyp iEuewsyuexhi oshitk stow umiok yservtory snstitute for gosmi y eserhD niversityofokyoDrigshiEwozumiD umiokD qifuD SHTEIPD tpn I epresenting up erEumioknde goll ortion efeg he up erEumioknde exp erimentD using the lrgest underground wE ter gerenkov detetorD hs een running sine epril ID IWWTF he totl live time for the nlysis hs rehed more thn QHH dysF he newest results in tmospheri neutrinoD solr neutrino nd relted topis re rep ortedF pigure IX he shemti view of up erEumioknde detetorF I sntro dution he up erEumioknde detetor is SHDHHH ton wter gerenkov detetor lo ted t depth of PDUHH meters wter equivlent in the umiok mine in tpnF e shemti view of detetor is shown s pig IF he detetor vityisRPmin height nd QW m in dimeterD lled with SHDHHH tons of pure wterF he duil mss for the mesurement of solr nd tmospheri neutrino intertions is PPDHHH tonsD whih is more thn PH times lrger thn tht of umiokndeF st onsists of twolyers of detetorF he inner tnk hs QQFV m dimeter nd QTFP m highF IIDIRT SH m 0 photomultiplier tu es @wsAD instrumented on ll surfes of the inner detetorD detet gerenkov photons rdited y reltivisti hrged prtilesF he outer lyerD pproximtely P m thikD is used s n ntiEounter where IDVVS PH m 0 ws is instrumentedF he ntiEounter is useful for identifying entering osmiEry muons nd for reduing gmmErys or neutrons from surrounding ro kF ulseEheight nd timing informtion from eh w re reorded nd used in the dt nlysisF up erEumioknde hs een suessfully op erted without ny serious troules sine epril IstD IWWTF he detetor hs een live in VS 7 of the timeF wost of the ded time is due to lirtionsF he umultive liveEtime of op ertion rehed more thn SHH dys in the fll of IWWUF he trnspreny of wter is out VH m mesured y using eletrons from " deyF he trigger threshold hd een out SFT we for eletrons t SH7 eieny from the eginning of the exp erimentF st hs een set to out RFT we sine wy IWWU to ollet muh lower energy dt smpleF he onentrtion of n in the wter is less thn S m Q fqGm whih is two order of mgnitude lower thn tht in umiokndeF he totl liveEtime of dt smple for nlysis of solr neutrinoD upEgoing "D tmospheri neutrino nd proton dey hs rehed more thn QHH dysF xow it is time to otin the onlusive results in neutrino osilltion studies with lrge sttistisF sn the following setionsD new results in solr neutrino nd in tmospheri neutrino nlyses re presentedF P olr neutrinos he un mintins its luminosity y the energy of nuler fusion retionsF hus the un emits lowEenergy @i IS weA eletron neutrinos @# A tht re pro dE # e uts of the nuler pro esses inside the unF yur understnding of those proE esses is reeted in the stndrd solr mo del @wAF he ux nd sp etrum of neutrinos orresp onding to eh nuler pro ess re well predited y wF pigE ure P shows the energy sp etr of the solr neutrino ux on the erth lulted P y w of fhll nd insonneult in IWWS @fEWSAF elso shown re the enE ergy threshold of ve urrent existing solr neutrino exp erimentsD the romestke Q R S T exp erimentD umiokndeD eqiD qevvi nd the presented exp erimentD U up erEumiokndeD in the sme gureF he rst oservtion of the solr neutrino ws hieved in the erly IWUH9s QU QU y hvis et lF y using of following retionsY gl C # 3 el C e @i ! e # HFVIR weAF heir otined result hve shown signint deit of the yield ompred to preditions sed on vrious versions of the wF he eqi nd UI UI qevvi exp eriments used following retionsY q C # 3 qe C e @i ! HFPQQ e # weAF hose exp eriments n detet muhlower energy neutrinos pro dued vi pEp4 hin tht mintin most of the un9s luminosityF he otined results re out hlf of the exp eted oneF umioknde hs p erformed the rst rel time mesurement of solr neutrinos y using of wter gerenkov tehniqueF olr neutrinos n e deteted through neutrinoEeletron stteringD #e 3 #eF he eletron energyD diretion nd the time of the retion re mesuredF he otined result ws out RH 7 of the exp ettionF he ux mesurements re summrized in the le IF ell the exp eriments showed signintly lower ux thn tht from the w preditionD while the detetion metho ds nd the energy thresholds of the mesurement re dierent mong eh otherF st is hrd to explin ll the existing results onsistently with wF he solr neutrinos whih re exp eted to e deteted in the romestke V U exp eriment re out VH 7 from fEneutrino nd out IS 7 from feEneutrinoD V while only fEneutrino n e deteted y the wter gerenkov detetorsF he otined htGw in the romestke exp eriment is out IGQD while it is out one hlf in umiokndeF his dierene suggests lmost no ontriution from U feEneutrino in the romestke dtF yn the other hndD the ontriution of pE U V p4EneutrinosD feEneutrino nd fEneutrino in the dt smple of q exp eriments re exp eted to e out SH 7D QH 7 nd IH 7D resp etivelyF he ux of pEp4E neutrino is onstrined y totl luminosity of the unF st gin my suggest strong U suppression of feEneutrinosF hose results from the existing exp eriments hints p ossile distortion of energy sp etrum of solr neutrinos whih n e explined y the hyp othesis of # 3 # osilltions osilltionF he distne etween the erth e x II IH P nd the un is $ IH m nd i $ IH weD so tht typil iGv is IH F sf the m # IH P is sustntilly lrger thn IH e D solr neutrinos with ny energy re fully osillted in the se of vuum osilltionsF hus htGw of ll the existing exp eriments should e sme nd the dierent htGw mong the exp eriments P P re hrdly explinedF yne of the senrio is tht m nd sin P eventully tke P P IH go o d4 vluesD for exmple @m Dsin P A$@IH DIAD to explin ll the resultsF his senrio is soElled the justEso osilltionF pigure QD tken from efFV shows P P the WS7 gFvF llowed regions of justEso solution in @m D sin P A speF he other ttrtive senrio whih ould explin ll the exp erimentl results is mtter W enhned osilltions of solr neutrinosD soElled w osilltionF pigure RD V P tken from efF shows the WS7 gFvF llowed regions of w solution in @m D P sin P A speF here re two domins of llowed regionsD so lled smll ngle solution nd lrge ngle solutionF st is predited tht the energy sp etrum of solr neutrinos would e distorted in the se of the smll ngle solutionF yn the other hndD the dyGnight eetD tht isD dierene etween dy nd night uxD would pigure PX he energy sp etr of the solr neutrino uxF elso shown re the energy threshold of the existing solr neutrino exp erimentsF e oserved in the se of the lrge ngle solutionF elEtime mesurement of solr neutrino is indisp ensle to detet those eetsD whih would e strong evidene of w osilltionF up erEumioknde n provide huge sttistis for those mesurement with its lrge duil mssF he presented solr neutrino dt of QURFP liveEdysD overing p erio d from wy QID IWWT through yt PHD IWWUF pirstD osmi rymuons nd dey eleE trons re disrded from the dt smple using totl energy dep osit in the deE tetor nd time dierene of the eventsF he vertex p osition of # Ee sttering nd the diretion of eletrons hve een reonstruted y using rrivlEtime inE formtion of gerenkov photons on the w9s of inner detetorF he energy of eletron hs een determined from numer of hit w9s in SH ns windowF he energy sleD the energy resolutionD the ngulr resolution nd the vertex p osition resolution re lirted minly with the eletron em from vsxeg systemF he vsxeg system n pro due n eletron em of S$IT we injeted to vrious p ositions in the detetorF he energyD ngulr nd p osition resoluE tions for VFT we eletrons re IT 7D PU degF nd VS mD resp etivelyF he unertinty of solute energy sle is I 7F foth of the p osition dep endene nd time vrine of the energy sle re I7D whih hs een heked with xiEgf soure y using the retion xi@nD AxiF o eliminte the kground @A rget@ixpFA ht w @fEWSA htGw CS CV CHXHVP UI TWIH IQU HFSHR q@eqiA U U HXHVW CQXW CV CHXHSU UI q@qevviA TWFUTFU IQU HFSHW RXS U HXHSW CIXP QU gl@romestkeA PFSSHFIRHFIR WFQ HFPUQHFHPI IXR CHXWQ e @r yDumiokndeA PFVHHFIWHFQQ TFTP HFRPQHFHSV P IXIP CHXHT CHXHW CHXWQ CHXHIU @A e @r yDup erEumFA PFQU TFTP HFQSV P HXHS HXHU IXIP HXHIQ @A ixp erimentl errors onlyF ttistil nd systemti errors re dded in qudrtureF @A reliminryF P le IX esults from urrent ve exp eriments nd the w fEWS preditions on QU UI T P the solr neutrino uxF rere the unit is x for gl nd q nd IH #am ase for e @r yA trgetD resp etivelyD where x mens solr neutrino unit4 dened P QT y I x aIH # ptures p er tom p er seondF )) 2 -9.4 (eV 2 m ∆ -9.6 log( -9.8 -10 -10.2 -10.4 -10.6 -10.8 -11 -11.2 spectrum 0 0.2 0.4 0.6 0.8 1 sin22θ pigure QX he WS 7 gFvF llowed region of justEso osilltion y rt nd vnE V gker re shown y the shded regionF elso shown re the preliminry WS7 gFvF nd WW7 gFvF ontours t justEso region from sp etrum nlysis without ux onstrint in up erEumiokndeF snsides of dshed lines re llowed t WS7 gFvFD nd right side of solid line is exluded t WW7 gFvF from sp etrum nlysisF )) -3 )) -3 2 2 2 (eV (eV 2 2 2 m m ∆ ∆ -4 log( log( -5 -6 -7 spectrum day and night 5bins -8 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 log(sin22θ) V pigure RX WS7 gFvF llowed region of w osilltion y rt nd vngker re shown y the shded regionF elso shown is WS7 gFvF exluded region of w P P osilltion nlysis without ux onstrintin@m Dsin P A speF hyGnight nlysis exludes region inside of solid line nd sp etrum nlysis exludes regions inside of dshed linesF 0.3 SK 374day 6.5-20MeV 22.5kt ALL 0.25 0.2 Events/day/kton/bin 0.15 0.1 0.05 0 -1 -0.5 0 0.5 1 θ cos sun pigure SX reliminry solr neutrino dt from the up erEumioknde exp eriment in QURFP dys of oservtionF e ler exess of events ner os aI is seenF he sun shp e of the exess distriution is repro dued well y the wg simultion with the V f ux of