Neutrino induced reactions in core-collapse supernovae: effects on the electron fraction
| Autor: | Osvaldo Civitarese, M. E. Mosquera, M. M. Saez |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Sterile neutrino
STERILE NEUTRINO Nuclear Theory Supernova Ciencias Físicas Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Electron R-process 01 natural sciences Nuclear physics purl.org/becyt/ford/1 [https] Nuclear Theory (nucl-th) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010306 general physics Neutrino oscillation Stellar evolution Mathematical Physics SUPERNOVA Solar and Stellar Astrophysics (astro-ph.SR) Physics 010308 nuclear & particles physics Electroweak interaction High Energy Physics::Phenomenology R-PROCESS Física Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Astronomía High Energy Physics - Phenomenology Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science r-process High Energy Physics::Experiment Neutrino CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| DOI: | 10.48550/arxiv.1808.03249 |
| Popis: | Neutrino-induced reactions are a basic ingredient in astrophysical processes like star evolution. The existence of neutrino oscillations affects the rate of nuclear electroweak decays which participates in the chain of events that determines the fate of the star. Among the processes of interest, the production of heavy elements in core-collapse supernovae is strongly dependent upon neutrino properties, like the mixing between different species of neutrinos. In this work, we study the effects of neutrino oscillations upon the electron fraction as a function of the neutrino mixing parameters, for two schemes: the 1+1-scheme (one active neutrino and one sterile neutrino) and the 2+1-scheme (two active neutrinos and one sterile neutrino). We have performed this analysis considering a core-collapse supernovae and determined the physical conditions needed to activate the nuclear reaction chains involved in the r-process. We found that the interactions of the neutrinos with matter and among themselves and the initial amount of sterile neutrinos in the neutrino-sphere might change the electron fraction, therefore affecting the onset of the r-process. We have set constrains on the active-sterile neutrino mixing parameters. They are the square-mass-difference Δm142 , the mixing angle sin22𝜃14, and the hindrance factor ξs for the occupation of sterile neutrinos. The calculations have been performed for different values of Xα, which is the fraction of alpha particles. For Xα=0 the r-process is taking place if Δm142≥2eV2, sin22𝜃14<0.8 and ξs<0.5. For larger values of Xα the region of parameters is strongly reduced. The present results are compared to results available in the literature. Facultad de Ciencias Astronómicas y Geofísicas Facultad de Ciencias Exactas Instituto de Física La Plata |
| Databáze: | OpenAIRE |
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