Phys. Rev. Lett. 92, 071301 (2004) [5 pages]

High Sensitivity Search for ν̅ e’s from the Sun and Other Sources at KamLAND

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K. Eguchi et al. KamLAND Collaboration
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Received 22 October 2003; published 20 February 2004

Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used to search for ν̅ e’s in the energy range 8.3<Eν̅ e<14.8  MeV. No candidates were found for an expected background of 1.1±0.4 events. This result can be used to obtain a limit on ν̅ e fluxes of any origin. Assuming that all ν̅ e flux has its origin in the Sun and has the characteristic 8B solar νe energy spectrum, we obtain an upper limit of 3.7×102  cm-2 s-1 (90% C.L.) on the ν̅ e flux. We interpret this limit, corresponding to 2.8×10-4 of the standard solar model 8B νe flux, in the framework of spin-flavor precession and neutrino decay models.


©2004 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v92/e071301
DOI: 10.1103/PhysRevLett.92.071301
PACS: 26.65.+t, 13.35.Hb, 14.60.St

* Present address: Institute for Cosmic Ray Research, University of Tokyo, Tokyo, Japan.
Present address: International Center for Elementary Particle Physics, University of Tokyo, Tokyo, Japan.

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