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Title: Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows

Abstract

Motivated by recent hints for sterile neutrinos from the reactor anomaly, we study active-sterile conversions in a three-flavor scenario (2 active + 1 sterile families) for three different representative times during the neutrino-cooling evolution of the proto-neutron star born in an electron-capture supernova. In our ''early model'' (0.5 s post bounce), the ν{sub e}-ν{sub s} MSW effect driven by Δm{sup 2} = 2.35eV{sup 2} is dominated by ordinary matter and leads to a complete ν{sub e}-ν{sub s} swap with little or no trace of collective flavor oscillations. In our ''intermediate'' (2.9 s p.b.) and ''late models'' (6.5 s p.b.), neutrinos themselves significantly modify the ν{sub e}-ν{sub s} matter effect, and, in particular in the late model, νν refraction strongly reduces the matter effect, largely suppressing the overall ν{sub e}-ν{sub s} MSW conversion. This phenomenon has not been reported in previous studies of active-sterile supernova neutrino oscillations. We always include the feedback effect on the electron fraction Y{sub e} due to neutrino oscillations. In all examples, Y{sub e} is reduced and therefore the presence of sterile neutrinos can affect the conditions for heavy-element formation in the supernova ejecta, even if probably not enabling the r-process in the investigated outflows of anmore » electron-capture supernova. The impact of neutrino-neutrino refraction is strong but complicated, leaving open the possibility that with a more complete treatment, or for other supernova models, active-sterile neutrino oscillations could generate conditions suitable for the r-process.« less

Authors:
;  [1]; ;  [2]
  1. Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München (Germany)
  2. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22279721
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 01; 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; COSMOLOGY; ELECTRON CAPTURE; ELECTRONS; EV RANGE; FLAVOR MODEL; NEUTRINO OSCILLATION; NEUTRINOS; NEUTRON STARS; OSCILLATIONS; PROTOSTARS; R PROCESS; REFRACTION; SUPERNOVAE

Citation Formats

Tamborra, Irene, Raffelt, Georg G., Hüdepohl, Lorenz, and Janka, Hans-Thomas. Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/01/013.
Tamborra, Irene, Raffelt, Georg G., Hüdepohl, Lorenz, & Janka, Hans-Thomas. Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows. United States. https://doi.org/10.1088/1475-7516/2012/01/013
Tamborra, Irene, Raffelt, Georg G., Hüdepohl, Lorenz, and Janka, Hans-Thomas. Sun . "Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows". United States. https://doi.org/10.1088/1475-7516/2012/01/013.
@article{osti_22279721,
title = {Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows},
author = {Tamborra, Irene and Raffelt, Georg G. and Hüdepohl, Lorenz and Janka, Hans-Thomas},
abstractNote = {Motivated by recent hints for sterile neutrinos from the reactor anomaly, we study active-sterile conversions in a three-flavor scenario (2 active + 1 sterile families) for three different representative times during the neutrino-cooling evolution of the proto-neutron star born in an electron-capture supernova. In our ''early model'' (0.5 s post bounce), the ν{sub e}-ν{sub s} MSW effect driven by Δm{sup 2} = 2.35eV{sup 2} is dominated by ordinary matter and leads to a complete ν{sub e}-ν{sub s} swap with little or no trace of collective flavor oscillations. In our ''intermediate'' (2.9 s p.b.) and ''late models'' (6.5 s p.b.), neutrinos themselves significantly modify the ν{sub e}-ν{sub s} matter effect, and, in particular in the late model, νν refraction strongly reduces the matter effect, largely suppressing the overall ν{sub e}-ν{sub s} MSW conversion. This phenomenon has not been reported in previous studies of active-sterile supernova neutrino oscillations. We always include the feedback effect on the electron fraction Y{sub e} due to neutrino oscillations. In all examples, Y{sub e} is reduced and therefore the presence of sterile neutrinos can affect the conditions for heavy-element formation in the supernova ejecta, even if probably not enabling the r-process in the investigated outflows of an electron-capture supernova. The impact of neutrino-neutrino refraction is strong but complicated, leaving open the possibility that with a more complete treatment, or for other supernova models, active-sterile neutrino oscillations could generate conditions suitable for the r-process.},
doi = {10.1088/1475-7516/2012/01/013},
url = {https://www.osti.gov/biblio/22279721}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 01,
volume = 2012,
place = {United States},
year = {2012},
month = {1}
}