Physics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phys...81b5901n&link_type=abstract
Physica Scripta, Volume 81, Issue 2, pp. 025901 (2010).
Physics
3
Scientific paper
An accurate estimate of the neutrino cooling rates is required in order to study the various stages of stellar evolution of massive stars. Neutrino losses from proto-neutron stars play a crucial role in deciding whether these stars would be crushed into black holes or explode as supernovae. Both pure leptonic and weak-interaction processes contribute to the neutrino energy losses in stellar matter. At low temperatures and densities, the characteristics of the early phase of presupernova evolution, cooling through neutrinos produced via the weak interaction, are important. Proton-neutron quasi-particle random phase approximation (pn-QRPA) theory has recently been used with success for the calculation of stellar weak-interaction rates of fp-shell nuclide. The lepton-to-baryon ratio (Ye) during early phases of stellar evolution of massive stars changes substantially, mainly due to electron captures on 56Ni. The stellar matter is transparent to the neutrinos produced during the presupernova evolution of massive stars. These neutrinos escape the site and assist the stellar core in maintaining a lower entropy. Here, an expanded calculation of weak-interaction-mediated neutrino and antineutrino cooling rates due to 56Ni in stellar matter using the pn-QRPA theory is presented. This detailed scale is appropriate for interpolation purposes and is of greater utility for simulation codes. The calculated rates are compared with earlier calculations. During the relevant temperature and density regions of stellar matter the reported rates show few differences compared with the shell model rates and might contribute in fine-tuning of the lepton-to-baryon ratio during the presupernova phases of stellar evolution of massive stars.
No associations
LandOfFree
Expanded calculation of weak-interaction-mediated neutrino cooling rates due to 56Ni in stellar matter 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 Expanded calculation of weak-interaction-mediated neutrino cooling rates due to 56Ni in stellar matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Expanded calculation of weak-interaction-mediated neutrino cooling rates due to 56Ni in stellar matter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1427250