Neutrino induced reactions in core-collapse supernovae: effects on the electron fraction

Abstract

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 $\Delta m_{14}^2$, the mixing angle ${\sin }^{2}2{\theta }_{14}$, and the hindrance factor ${\xi }_s$ for the occupation of sterile neutrinos. The calculations have been performed for different values of $X_{\alpha }$, which is the fraction of $\alpha$-particles. For $X_{\alpha }=0$ the r-process is taking place if $\Delta m_{14}^2\ge 2{\mathrm{eV}}^2$, ${\sin }^{2}2{\theta }_{14}<0.8$ and ${\xi }_s<0.5$. For larger values of $X_{\alpha }$ the region of parameters is strongly reduced. The present results are compared to results available in the literature.

References in corpus (37)

• Evidence for Neutrino Oscillations from the Observation of Electron Anti-neutrinos in a Muon Anti-Neutrino Beam
• Limits on Neutrino Oscillations from the CHOOZ Experiment
• Explosion Mechanisms of Core-Collapse Supernovae
• Theory of Core-Collapse Supernovae
• Evidence for ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ Oscillations from the LSND Experiment at LAMPF
• Nucleosynthesis in neutrino-driven winds: I. The physical conditions
• Measurement of Neutrino Oscillation by the K2K Experiment
• Collective Neutrino Oscillations
• The role of sterile neutrinos in cosmology and astrophysics
• Measurement of the solar neutrino capture rate with gallium metal. III: Results for the 2002--2007 data-taking period
• Monte Carlo Study of Supernova Neutrino Spectra Formation
• Improved Search for ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ Oscillations in the MiniBooNE Experiment
• Candidate Events in a Search for Muon Antineutrino to Electron Antineutrino Oscillations
• A Search for Electron Neutrino Appearance at the Delta m**2 ~ 1 eV**2 Scale
• Simulation of Coherent Non-Linear Neutrino Flavor Transformation in the Supernova Environment I: Correlated Neutrino Trajectories
• Neutrino Signal of Electron-Capture Supernovae from Core Collapse to Cooling
• Complete results for five years of GNO solar neutrino observations
• New results on solar neutrino fluxes from 192 days of Borexino data
• Solar neutrino results in Super-Kamiokande-III
• Constraints on ${\theta }_{13}$ from A Three-Flavor Oscillation Analysis of Reactor Antineutrinos at KamLAND
• Nucleosynthesis in neutrino-driven winds: II. Implications for heavy element synthesis
• Collective neutrino flavor transitions in supernovae and the role of trajectory averaging
• A Combined ${\nu }_{\mu }\to {\nu }_e$ and ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ Oscillation Analysis of the MiniBooNE Excesses
• Neutrino-Neutrino Scattering and Matter-Enhanced Neutrino Flavor Transformation in Supernovae
• Physics of Synchronized Neutrino Oscillations Caused by Self-Interactions
• Neutrino Mixing and Nucleosynthesis in Core-Collapse Supernovae
• An Active-Sterile Neutrino Transformation Solution for r-Process Nucleosynthesis
• The Origin of the Heavy Elements: Recent Progress in the Understanding of the r-Process
• Active-Sterile Neutrino Conversion: Consequences for the r-Process and Supernova Neutrino Detection
• Supernova Bounds on Resonant Active-Sterile Neutrino Conversions
• Neutrino-nucleus reactions and their role for supernova dynamics and nucleosynthesis
• Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows
• Measurement of the ${\nu }_e$ and Total ${}^8$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase-III Data Set
• Impact of neutrino flavor oscillations on the neutrino-driven wind nucleosynthesis of an electron-capture supernova
• Reactor Measurement of theta_12; Principles, Accuracies and Physics Potentials
• Triggering collective oscillations by three-flavor effects
• Effects of active-sterile neutrino mixing during primordial nucleosynthesis

Cited by in corpus (4)

• Titanium and Iron in the Cassiopeia A Supernova Remnant
• Neutrino interactions in liquid scintillators including active-sterile neutrino mixing
• Dark matter, supernova neutrinos and other backgrounds in direct dark matter searches. The ANDES laboratory prospects
• Neutrino mixing in nuclear rapid neutron-capture processes