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Title: Reactor- and Geo-Neutrino Detections from KamLAND

Abstract

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 {nu}-bare oscillation effects. In the context of the {nu}-bare {yields} {nu}-barx oscillation with CPT invariance, the combined analysis of data from KamLAND and solar neutrino experiments yields {delta}m{sup 2} = 7.9{sub -0.5}{sup +0.6} x 10{sup -5} eV{sup 2} and tan{sup 2} {theta} = 0.40{sub -0.07}{sup +0.10}. KamLAND has recently succeeded in detecting geo-neutrinos, {nu}-bares produced by natural radioactivity in the Earth. The present measurement is consistent with current geophysical models and constraints the {nu}-bare flux from U and Th in the planet to be less than 1.62 x 107 cm-2s-1 at 99% C.L.

Authors:
 [1]
  1. Research Center for Neutrino Science, Tohoku University, Aramaki, Aoba, Sendai, 980-8578 (Japan)
Publication Date:
OSTI Identifier:
20798039
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 815; Journal Issue: 1; Conference: 25. international conference on physics in collision, Prague (Czech Republic), 5-9 Jul 2005; Other Information: DOI: 10.1063/1.2173572; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CPT THEOREM; DATA ANALYSIS; ENERGY SPECTRA; GEOPHYSICS; NATURAL RADIOACTIVITY; NEUTRINO DETECTION; NEUTRINO OSCILLATION; NEUTRINO REACTIONS; SOLAR NEUTRINOS

Citation Formats

Suzuki, Atsuto. Reactor- and Geo-Neutrino Detections from KamLAND. United States: N. p., 2006. Web. doi:10.1063/1.2173572.
Suzuki, Atsuto. Reactor- and Geo-Neutrino Detections from KamLAND. United States. doi:10.1063/1.2173572.
Suzuki, Atsuto. Wed . "Reactor- and Geo-Neutrino Detections from KamLAND". United States. doi:10.1063/1.2173572.
@article{osti_20798039,
title = {Reactor- and Geo-Neutrino Detections from KamLAND},
author = {Suzuki, Atsuto},
abstractNote = {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 {nu}-bare oscillation effects. In the context of the {nu}-bare {yields} {nu}-barx oscillation with CPT invariance, the combined analysis of data from KamLAND and solar neutrino experiments yields {delta}m{sup 2} = 7.9{sub -0.5}{sup +0.6} x 10{sup -5} eV{sup 2} and tan{sup 2} {theta} = 0.40{sub -0.07}{sup +0.10}. KamLAND has recently succeeded in detecting geo-neutrinos, {nu}-bares produced by natural radioactivity in the Earth. The present measurement is consistent with current geophysical models and constraints the {nu}-bare flux from U and Th in the planet to be less than 1.62 x 107 cm-2s-1 at 99% C.L.},
doi = {10.1063/1.2173572},
journal = {AIP Conference Proceedings},
number = 1,
volume = 815,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2006},
month = {Wed Feb 08 00:00:00 EST 2006}
}