Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-13
Astron.Astrophys. 443 (2005) 201-210
Astronomy and Astrophysics
Astrophysics
10 pages, 10 figures, revised version (ionic mixture case treated differently, EoS error removed), accepted by Astronomy & Ast
Scientific paper
10.1051/0004-6361:20053236
The role of ion-ion correlations in suppressing neutrino-nucleus elastic scattering during stellar core collapse is reinvestigated, using two different equations of state. We test the improved description by Itoh et al. against the treatment suggested by Horowitz and find that the stronger cross section reduction for small momentum transfer in the former case does not lead to noticeable changes of the core deleptonization and entropy increase during collapse, because the improvements are relevant below neutrino trapping conditions only for very low neutrino energies, corresponding to a very small phase space volume. Treating screening effects for ionic mixtures by the linear mixing rule, applied to the collection of representative heavy nucleus, alpha particles, and free nucleons, which is assumed to characterize the composition in nuclear statistical equilibrium, we cannot determine mentionable differences during stellar collapse, because alpha particles are not sufficiently abundant and their coherent scattering opacity is too small.
Buras Robert
Janka H.-Th.
Liebendoerfer Matthias
Marek Andreas
Rampp Markus
No associations
LandOfFree
On ion-ion correlation effects during stellar core collapse does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On ion-ion correlation effects during stellar core collapse, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On ion-ion correlation effects during stellar core collapse will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-250205