Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..586...83s&link_type=abstract
RELATIVISTIC ASTROPHYSICS: 20th Texas Symposium. AIP Conference Proceedings, Volume 586, pp. 83-94 (2001).
Astronomy and Astrophysics
Astrophysics
Cosmic Ray Neutrinos, Solar Cosmic Ray Particles, Solar Interior, Neutrino Oscillations, Cherenkov Counters, Cosmic Ray Energy Spectra, Supernova Remnants, Neutrino Detection
Scientific paper
Recent results from Super-Kamiokande on atmospheric neutrinos, solar neutrinos and supernova neutrinos are presented. The atmospheric neutrino data shows an evidence for νμ oscillations in the ratio of νμ/νe and zenith angle distributions of μ-like events. The neutrino oscillation parameters obtained from the atmospheric neutrino data are Δm2=(1.7-4)×10-3 eV2 and sin2 2θ>0.89 for νμ<-->ντ oscillations. The zenith angle distributions of higher energy atmospheric neutrino data show that the pure νμ<-->ντ oscillations are favored over the pure νμ<-->νsterile oscillations. The analyses of solar neutrino data on day/night difference in flux and spectral shape of 8B solar neutrinos constrained the oscillation parameters for νe oscillations. The small mixing angle solution and just-so solutions are disfavored with about 95% C.L. The flux constrained analysis of day/night and energy spectrum favours large mixing solutions. The huge Super-Kamiokande detector is able to detect ~4000 neutrino events, if a supernova happens at the center of our galaxy. No neutrino burst has been observed at SK yet. Progress of the search for relic supernova neutrinos is also discussed. .
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