Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-06
Astrophys.J.707:1495-1505,2009
Astronomy and Astrophysics
Astrophysics
12 pages, 11 figures
Scientific paper
10.1088/0004-637X/707/2/1495
Neutrinos emitted during the collapse, bounce and subsequent explosion provide information about supernova dynamics. The neutrino spectra are determined by weak interactions with nuclei and nucleons in the inner regions of the star, and thus the neutrino spectra are determined by the composition of matter. The composition of stellar matter at temperature ranging from $T=1-3$ MeV and densities ranging from $10^{-5}$ to 0.1 times the saturation density is explored. We examine the single-nucleus approximation commonly used in describing dense matter in supernova simulations and show that, while the approximation is accurate for predicting the energy and pressure at most densities, it fails to predict the composition accurately. We find that as the temperature and density increase, the single nucleus approximation systematically overpredicts the mass number of nuclei that are actually present and underestimates the contribution from lighter nuclei which are present in significant amounts.
Donangelo Raul
Famiano Michael Andrew
Lynch William G.
Souza Sergio R.
Steiner Andrew W.
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