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Title: Measurement of the {sup 8}B solar neutrino flux with the KamLAND liquid scintillator detector

Abstract

We report a measurement of the neutrino-electron elastic scattering rate from {sup 8}B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5-MeV analysis threshold is 1.49 {+-} 0.14(stat) {+-} 0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a {sup 8}B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77 {+-} 0.26(stat) {+-} 0.32(syst) x10{sup 6} cm{sup -2}s{sup -1}. The analysis threshold is driven by {sup 208}Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic {sup 11}Be. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Research Center for Neutrino Science, Tohoku University, Sendai 980-8578 (Japan)
Publication Date:
OSTI Identifier:
21596791
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.84.035804; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BERYLLIUM 11; BORON 8; ELASTIC SCATTERING; ELECTRONS; FLAVOR MODEL; NEUTRINO OSCILLATION; NEUTRINO-ELECTRON INTERACTIONS; RECOILS; SCINTILLATION COUNTERS; SOLAR NEUTRINOS; SPECTRA; STAR MODELS; THALLIUM 208; ALKALINE EARTH ISOTOPES; BERYLLIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; BORON ISOTOPES; COMPOSITE MODELS; ELEMENTARY PARTICLES; EVEN-ODD NUCLEI; FERMIONS; HEAVY NUCLEI; INTERACTIONS; ISOTOPES; LEPTON-LEPTON INTERACTIONS; LEPTONS; LIGHT NUCLEI; MASSLESS PARTICLES; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; MILLISECONDS LIVING RADIOISOTOPES; MINUTES LIVING RADIOISOTOPES; NEUTRINOS; NUCLEI; ODD-ODD NUCLEI; PARTICLE INTERACTIONS; PARTICLE MODELS; QUARK MODEL; RADIATION DETECTORS; RADIATIONS; RADIOISOTOPES; SCATTERING; SECONDS LIVING RADIOISOTOPES; SOLAR PARTICLES; SOLAR RADIATION; STELLAR RADIATION; THALLIUM ISOTOPES

Citation Formats

Abe, S., Furuno, K., Gando, A., Gando, Y., Ichimura, K., Ikeda, H., Kibe, Y., Kimura, W., Kishimoto, Y., Minekawa, Y., Mitsui, T., Morikawa, T., Nagai, N., Nakajima, K., Nakamura, M., Narita, K., Shimizu, I., Shimizu, Y., Shirai, J., and Suekane, F. Measurement of the {sup 8}B solar neutrino flux with the KamLAND liquid scintillator detector. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.035804.
Abe, S., Furuno, K., Gando, A., Gando, Y., Ichimura, K., Ikeda, H., Kibe, Y., Kimura, W., Kishimoto, Y., Minekawa, Y., Mitsui, T., Morikawa, T., Nagai, N., Nakajima, K., Nakamura, M., Narita, K., Shimizu, I., Shimizu, Y., Shirai, J., & Suekane, F. Measurement of the {sup 8}B solar neutrino flux with the KamLAND liquid scintillator detector. United States. doi:10.1103/PHYSREVC.84.035804.
Abe, S., Furuno, K., Gando, A., Gando, Y., Ichimura, K., Ikeda, H., Kibe, Y., Kimura, W., Kishimoto, Y., Minekawa, Y., Mitsui, T., Morikawa, T., Nagai, N., Nakajima, K., Nakamura, M., Narita, K., Shimizu, I., Shimizu, Y., Shirai, J., and Suekane, F. Thu . "Measurement of the {sup 8}B solar neutrino flux with the KamLAND liquid scintillator detector". United States. doi:10.1103/PHYSREVC.84.035804.
@article{osti_21596791,
title = {Measurement of the {sup 8}B solar neutrino flux with the KamLAND liquid scintillator detector},
author = {Abe, S. and Furuno, K. and Gando, A. and Gando, Y. and Ichimura, K. and Ikeda, H. and Kibe, Y. and Kimura, W. and Kishimoto, Y. and Minekawa, Y. and Mitsui, T. and Morikawa, T. and Nagai, N. and Nakajima, K. and Nakamura, M. and Narita, K. and Shimizu, I. and Shimizu, Y. and Shirai, J. and Suekane, F.},
abstractNote = {We report a measurement of the neutrino-electron elastic scattering rate from {sup 8}B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5-MeV analysis threshold is 1.49 {+-} 0.14(stat) {+-} 0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a {sup 8}B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77 {+-} 0.26(stat) {+-} 0.32(syst) x10{sup 6} cm{sup -2}s{sup -1}. The analysis threshold is driven by {sup 208}Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic {sup 11}Be. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.},
doi = {10.1103/PHYSREVC.84.035804},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}