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KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected from standard assumptions about nu;(e) propagation at the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay events to the expected number without nu;(e) disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for(More)
We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 nu (e) candidate events with energies above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8+/-7.3 expected background events, the statistical significance for(More)
The detection of electron antineutrinos produced by natural radioactivity in the Earth could yield important geophysical information. The Kamioka liquid scintillator antineutrino detector (KamLAND) has the sensitivity to detect electron antineutrinos produced by the decay of 238U and 232Th within the Earth. Earth composition models suggest that the(More)
The motivation, present status, and future plans of the search for ββ(0ν) decay are reviewed. It is argued that, motivated by the recent observations of neutrino oscillations, there is a reasonable hope that ββ(0ν) decay corresponding to the neutrino mass scale suggested by oscillations, mν ≈ 50 meV, actually exists. The challenges to achieve the(More)
All Rights Reserved iii Acknowledgements First, I would like to thank my advisor, Rod Goodman, for providing me with the resources and tools necessary to produce this work. Next, I would like to thank the members of my thesis defense committee, Martin, and Chris Diorio. I would also like to thank Petr Vogel for being on my candidacy committee. Thanks also(More)
The status of the search for neutrinoless double beta decay is reviewed. The effort to reach the sensitivity needed to cover the effective Majorana neutrino mass corresponding to the degenerate and inverted mass hierarchy is described. Various issues concerning the theory (and phenomenol-ogy) of the relation between the 0νββ decay rate and the absolute(More)
Mass signature of supernova ν µ and ν τ neutrinos in SuperKamiokande The νµ and ντ neutrinos (and their antiparticles) from a Galactic core-collapse supernova can be observed in a water-ˇ Cerenkov detector by the neutral-current excitation of 16 O. The number of events expected is several times greater than from neutral-current scattering on electrons. The(More)
The following Listings concern measurements of the properties of neutrinos produced in association with e ± , µ ± , and τ ±. Nearly all of the measurements, all of which so far are upper limits, actually concern superpositions of the mass eigenstates ν i , which are in turn related to the weak eigenstates ν , via the neutrino mixing matrix |ν = i U i |ν i.(More)