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Title: The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties

Abstract

Core-collapse supernova neutrinos undergo a variety of phenomena when they travel from the high neutrino density region and large matter densities to the Earth. We perform analytical calculations of the supernova neutrino fluxes including collective effects due to the neutrino-neutrino interactions, the Mikheev-Smirnov-Wolfenstein (MSW) effect due to the neutrino interactions with the background matter and decoherence of the wave packets as they propagate in space. We predict the numbers of one- and two-neutron charged and neutral-current electron-neutrino scattering on lead events. We show that, due to the energy thresholds, the ratios of one- to two-neutron events are sensitive to the pinching parameters of neutrino fluxes at the neutrinosphere, almost independently of the presently unknown neutrino properties. Besides, such events have an interesting sensitivity to the spectral split features that depend upon the presence/absence of energy equipartition among neutrino flavors. Our calculations show that a lead-based observatory like the Helium And Lead Observatory (HALO) has the potential to pin down important characteristics of the neutrino fluxes at the neutrinosphere, and provide us with information on the neutrino transport in the supernova core.

Authors:
;  [1]
  1. Institut de Physique Nucléaire, F-91406 Orsay cedex, CNRS/IN2P3 and University of Paris-XI (France)
Publication Date:
OSTI Identifier:
22280230
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COSMIC NEUTRINOS; COSMIC NEUTRONS; COSMOLOGY; DENSITY; FLAVOR MODEL; GRAVITATIONAL COLLAPSE; HELIUM; NEUTRAL CURRENTS; NEUTRINO-ELECTRON INTERACTIONS; NEUTRINO-NEUTRINO INTERACTIONS; POTENTIALS; SENSITIVITY; WAVE PACKETS

Citation Formats

Väänänen, Daavid, and Volpe, Cristina. The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/10/019.
Väänänen, Daavid, & Volpe, Cristina. The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties. United States. doi:10.1088/1475-7516/2011/10/019.
Väänänen, Daavid, and Volpe, Cristina. Sat . "The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties". United States. doi:10.1088/1475-7516/2011/10/019.
@article{osti_22280230,
title = {The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties},
author = {Väänänen, Daavid and Volpe, Cristina},
abstractNote = {Core-collapse supernova neutrinos undergo a variety of phenomena when they travel from the high neutrino density region and large matter densities to the Earth. We perform analytical calculations of the supernova neutrino fluxes including collective effects due to the neutrino-neutrino interactions, the Mikheev-Smirnov-Wolfenstein (MSW) effect due to the neutrino interactions with the background matter and decoherence of the wave packets as they propagate in space. We predict the numbers of one- and two-neutron charged and neutral-current electron-neutrino scattering on lead events. We show that, due to the energy thresholds, the ratios of one- to two-neutron events are sensitive to the pinching parameters of neutrino fluxes at the neutrinosphere, almost independently of the presently unknown neutrino properties. Besides, such events have an interesting sensitivity to the spectral split features that depend upon the presence/absence of energy equipartition among neutrino flavors. Our calculations show that a lead-based observatory like the Helium And Lead Observatory (HALO) has the potential to pin down important characteristics of the neutrino fluxes at the neutrinosphere, and provide us with information on the neutrino transport in the supernova core.},
doi = {10.1088/1475-7516/2011/10/019},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2011,
place = {United States},
year = {2011},
month = {10}
}