Abstract
Neutron capture and neutrino absorption are of fundamental importance in the synthesis of elements. Both processes can be affected by the extreme conditions of the matter undergoing nucleosynthesis. In this work, we present results of neutron capture rates on 46Mg and several Sn isopotes. We find that the high degeneracy of neutron matter, a result of the large pressures found in a neutron star, changes the captures rates by orders of magnitude compared to those of non-degenerate neutron matter. We also study the neutrino opacity above the symmetry axis of a black hole accretion disk. We find that there is a region, where matter circulates around the black hole in stable orbits, with potentially low neutrino opacity. This motivates further studies of neutrino emission in the vicinity of a black hole.
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