Impact of neutrino flavor oscillations on the neutrino-driven wind nucleosynthesis of an electron-capture supernova
- Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching (Germany)
- GRAPPA Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam (Netherlands)
- iTHES Research Group, RIKEN, Wako, Saitama 351-0198 (Japan)
Neutrino oscillations, especially to light sterile states, can affect nucleosynthesis yields because of their possible feedback effect on the electron fraction (Y{sub e}). For the first time, we perform nucleosynthesis calculations for neutrino-driven wind trajectories from the neutrino-cooling phase of an 8.8 M{sub ⊙} electron-capture supernova (SN), whose hydrodynamic evolution was computed in spherical symmetry with sophisticated neutrino transport and whose Y{sub e} evolution was post-processed by including neutrino oscillations between both active and active–sterile flavors. We also take into account the α-effect as well as weak magnetism and recoil corrections in the neutrino absorption and emission processes. We observe effects on the Y{sub e} evolution that depend in a subtle way on the relative radial positions of the sterile Mikheyev–Smirnov–Wolfenstein resonances, on collective flavor transformations, and on the formation of α particles. For the adopted SN progenitor, we find that neutrino oscillations, also to a sterile state with eV mass, do not significantly affect the element formation and in particular cannot make the post-explosion wind outflow neutron-rich enough to activate a strong r-process. Our conclusions become even more robust when, in order to mimic equation-of-state-dependent corrections due to nucleon potential effects in the dense-medium neutrino opacities, six cases with reduced Y{sub e} in the wind are considered. In these cases, despite the conversion of active neutrinos to sterile neutrinos, Y{sub e} increases or is not significantly lowered compared to the values obtained without oscillations and active flavor transformations. This is a consequence of a complicated interplay between sterile-neutrino production, neutrino–neutrino interactions, and α-effect.
- OSTI ID:
- 22882854
- Journal Information:
- Astrophysical Journal, Vol. 808, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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Related Subjects
COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
CONVERSION
ELECTRON CAPTURE
EQUATIONS OF STATE
HYDRODYNAMICS
MAGNETISM
MASS
NEUTRINO OSCILLATION
NEUTRONS
NUCLEOSYNTHESIS
OSCILLATIONS
PARTICLE PRODUCTION
R PROCESS
RESONANCE
SPHERICAL CONFIGURATION
STELLAR WINDS
STERILE NEUTRINOS
SUPERNOVAE
SYMMETRY