Real-time, directional measurement of sup 8 B solar neutrinos in the Kamiokande II detector

Journal Article · Tue Oct 15 00:00:00 EDT 1991 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.44.2241· OSTI ID:5031533

Hirata, K S; Inoue, K; Ishida, T; Kajita, T; Kihara, K; Nakahata, M; Nakamura, K; Ohara, S; Sato, N; Suzuki, Y; Totsuka, Y; Yaginuma, Y ^[1]; Mori, M; Oyama, Y; Suzuki, A; Takahashi, K; Yamada, M ^[2]; Koshiba, M; Nishijima, K ^[3]; Suda, T ; Tajima, T ^[4]; Miyano, K; Miyata, H; Takei, H ^[5]; Fukuda, Y; Kodera, E; Nagashima, Y; Takita, M ^[6]; Kaneyuki, K; Tanimori, T ^[7]; Beier, E W; Feldscher, L R; Frank, E D; Frati, W; Kim, S B; Mann, A K; Newcomer, F M; Van Berg, R; Zhang, W ^[8]

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1. Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188 (Japan)
2. National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305 (Japan)
3. Tokai University, Shibuya, Tokyo 151 (Japan)
4. Department of Physics, Kobe University, Kobe, Hyogo 657 (Japan)
5. Niigata University, Niigata, Niigata 950-21 (Japan)
6. Department of Physics, Osaka University, Toyonaka, Osaka 560 (Japan)
7. Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152 (Japan)
8. Department of P

The method of {sup 8}B solar-neutrino measurement by means of the reaction {nu}{sub {ital e}e}{r arrow}{nu}{sub {ital e}e} in the Kamiokande II detector is described in detail. A data sample of 1040 live detector days in the time period January 1987 through April 1990 yields a clear directional correlation of the solar-neutrino-induced electron events with respect to the Sun and a measurement of the differential electron energy distribution. The measured flux of {sup 8}B solar neutrinos from the subsamples of 450 days at electron energy threshold {ital E}{sub {ital e}}{ge}9.3 MeV, and 590 days at {ital E}{sub {ital e}}{ge}7.5 MeV relative to calculations of the {sup 8}B flux based on the standard solar model are 0.46{plus minus}0.05(stat){plus minus}0.06(syst) times the prediction of Bahcall and Ulrich, and 0.70{plus minus}0.08(stat){plus minus}0.09(syst) times the prediction of Turck-Chieze {ital et} {ital al}.$---- The shape of the recoil electron energy distribution is consistent with that expected from the product of the known shape of the neutrino flux from {sup 8}B {beta} decay and the cross section for {nu}{sub {ital e}e}{r arrow}{nu}{sub {ital e}e} scattering. Within the statistical error, there is no evidence in the solar-neutrino signal for a significant time variation.

• OSTI ID: 5031533
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 44:8; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
NEUTRINO-ELECTRON INTERACTIONS
NEUTRINO DETECTION
SOLAR NEUTRINOS
ANGULAR DISTRIBUTION
ELASTIC SCATTERING
ENERGY SPECTRA
EQUATIONS OF STATE
MAGNETIC FIELDS
RECOILS
STANDARD MODEL
THRESHOLD ENERGY
DETECTION
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY
EQUATIONS
FERMIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRINOS
PARTICLE INTERACTIONS
PARTICLE MODELS
RADIATION DETECTION
RADIATIONS
SCATTERING
SOLAR PARTICLES
SOLAR RADIATION
SPECTRA
STELLAR RADIATION
UNIFIED GAUGE MODELS
640101* - Astrophysics & Cosmology- Cosmic Radiation
440104 - Radiation Instrumentation- High Energy Physics Instrumentation