A high sensitivity search for electron anti-neutrinos from the sun and other sources at Kamland

Data corresponding to a KamLAND detector exposure of 0.28 kton-year has been used to search for {bar {nu}}{sub e}'s in the energy range 8.3 MeV < E{sup {bar {nu}}{sub e}} < 14.8 MeV. No candidates were found for an expected background of 1.1 {+-} 0.4 events. This result can be used to obt...

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Veröffentlicht in:	Physical review letters 2003-10, Vol.92 (7)
Hauptverfasser:	Eguchi, K., Enomoto, S., Furuno, K., Hanada, H., Ikeda, H., Ikeda, K., Inoue, K., Ishihara, K., Iwamoto, T., Kawashima, T., Kishimoto, Y., Koga, M., Koseki, Y., Maeda, T., Mitsui, T., Motoki, M., Nakajima, K., Nakajima, T., Ogawa, H., Owada, K., Piquemal, F., Shimizu, I., Shirai, J., Suekane, F., Suzuki, A., Tada, K., Tajima, O., Takayama, T., Tamae, K., Watanabe, H., Busenitz, J., Djurcic, Z., McKinny, K., Mei, D.-M., Piepke, A., Yakushev, E., Berger, B.E., Chan, Y.D., Decowski, M.P., Dwyer, D.A., Freedman, S.J., Fu, Y., Fujikawa, B.K., Goldman, J., Heeger, K.M., Lesko, K.T., Luk, K.-B., Murayama, H., Nygren, D.R., Okada, C.E., Poon, A.W.P., Steiner, H.M., Winslow, L.A., Horton-Smith, G.A., Mauger, C., McKeown, R.D., Tipton, B., Vogel, P., Lane, C.E., Miletic, T., Gorham, P.W., Guillian, G., Learned, J.G., Maricic, J., Matsuno, S., Pakvasa, S., Dazeley, S., Hatakeyama, S., Svoboda, R., Dieterle, B.D., DiMauro, M., Detwiler, J., Gratta, G., Ishii, K., Tolich, N., Uchida, Y., Batygov, M., Bugg, W., Efremenko, Y., Kanyshkov, Y., Kozlov, A., Nakamura, Y., Gould, C.R., Karwowski, H.J., Markoff, D.M., Messimore, J.A., Nakamura, K., Rohm, R.M., Tornow, W., Young, A.R., Chen, M-J., Wang, Y-F.
Format:	Artikel
Sprache:	eng
Schlagworte:	CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DECAY ELECTRONS ENERGY RANGE NEUTRINOS ORIGIN PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PRECESSION SENSITIVITY STAR MODELS SUN
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Zusammenfassung:	Data corresponding to a KamLAND detector exposure of 0.28 kton-year has been used to search for {bar {nu}}{sub e}'s in the energy range 8.3 MeV < E{sup {bar {nu}}{sub 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 {bar {nu}}{sub e} fluxes of any origin. Assuming that all {bar {nu}}{sub e} flux has its origin in the Sun and has the characteristic {sup 8}B solar {nu}{sub e} energy spectrum, we obtain an upper limit of 3.7 x 10{sup 2} cm{sup -2} s{sup -1} (90 percent C.L.) on the {bar {nu}}{sub e} flux. We interpret this limit, corresponding to 2.8 x 10{sup -4} of the Standard Solar Model {sup 8}B {nu}{sub e} flux, in the framework of spin-flavor precession and neutrino decay models.
ISSN:	0031-9007 1079-7114