Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...463..261l&link_type=abstract
Astronomy and Astrophysics, Volume 463, Issue 1, February III 2007, pp.261-264
Astronomy and Astrophysics
Astrophysics
2
Supernovae: General, Nuclear Reactions, Nucleosynthesis, Abundances, Methods: Numerical
Scientific paper
Aims:With the new electron capture results from the improved GT resonance distribution, we analyzed the electron screening effect on electron capture at the presupernova stage. Methods: The relativistically degenerate electron liquid screening potential derived from the linear response theory are adopted. The calculation of the electron capture rates is based on the shell-model. Both the change of electron energy and the shift in the threshold for electron capture in screening are taken into account. Results: The results indicate that the influence of electron screening on the electron capture is prominent in high-density matter. As the improved electron capture rate is considered, screening effect on the electron capture rate increases by about 1 percent at ρ Y_e>109 g/cm^3. Conclusions: .The influence of screening on the electron capture reaction is about 10 percent for 56Co at ρ Y_e≈109 g/cm^3. Screening may affect the structure and evolution of presupernova and should be included in any precise simulation.
Liu Men-Quan
Luo Zhi-Quan
Zhang James J.
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