Reactor- and Geo-Neutrino Detections from KamLAND

Details Reactor- and Geo-Neutrino Detections from KamLAND Reactor- and Geo-Neutrino Detections from KamLAND

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..815...19s&link_type=abstract

XXV PHYSICS IN COLLISION: Proceedings of the XXV International Conference on Physics in Collision. AIP Conference Proceedings, V

Physics

Radioactivity Methods, Neutrino Mass And Mixing

Scientific paper

Based on 766 ton-year exposure, the reactor anti-neutrino disappearance was reconfirmed with 99.998% C.L. and the observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance. These results prefer the νe oscillation effects. In the context of the νe --> νx oscillation with CPT invariance, the combined analysis of data from KamLAND and solar neutrino experiments yields Δm2 = 7.9-0.5+0.6 × 10-5 eV2 and tan2 θ = 0.40-0.07+0.10. KamLAND has recently succeeded in detecting geo-neutrinos, νes produced by natural radioactivity in the Earth. The present measurement is consistent with current geophysical models and constraints the νe flux from U and Th in the planet to be less than 1.62 × 107 cm-2s-1 at 99% C.L.

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