Future Detection of Supernova Neutrino Burst and Explosion Mechanism
- Department of Physics, University of Tokyo, Tokyo 113 (Japan)
- Research Center for the Early Universe, University of Tokyo, Tokyo 113 (Japan)
- Lawrence Livermore National Laboratory, 7000 East Avenue, L-015, Livermore, CA 94550 (United States)
Future detection of a supernova neutrino burst by large underground detectors would give important information for the explosion mechanism of collapse-driven supernovae. We studied the statistical analysis for the future detection of a nearby supernova by using a numerical supernova model and realistic Monte Carlo simulations of detection by the Super-Kamiokande detector. We mainly discuss the detectability of the signatures of the delayed explosion mechanism in the time evolution of the {ovr {nu}}{sub e} luminosity and spectrum. For a supernova at 10 kpc away from the Earth, we find not only that the signature is clearly discernible but also that the deviation of the energy spectrum from the Fermi-Dirac (FD) distribution can be observed. The deviation from the FD distribution would, if observed, provide a test for the standard picture of neutrino emission from collapse-driven supernovae. For the {ital D}=50 kpc case, the signature of the delayed explosion is still observable, but statistical fluctuation is too large to detect the deviation from the FD distribution. We also propose a method for statistical reconstruction of the time evolution of {ovr {nu}}{sub e} luminosity and spectrum from data, by which we can get a smoother time evolution and smaller statistical errors than by a simple, time-binning analysis. This method is useful especially when the available number of events is relatively small, e.g., a supernova in the LMC or SMC. A neutronization burst of {nu}{sub {ital e}}`s produces about five scattering events when D=10 kpc, and this signal is difficult to distinguish from {ovr {nu}}{sub e}{ital p} events. {copyright} {ital {copyright} 1998.} {ital The American Astronomical Society}
- OSTI ID:
- 642458
- Journal Information:
- Astrophysical Journal, Vol. 496, Issue 1; Other Information: PBD: Mar 1998
- Country of Publication:
- United States
- Language:
- English
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