Volume 463, Number 1, February III 2007
|Page(s)||261 - 264|
|Section||Stellar structure and evolution|
|Published online||23 November 2006|
Screening effect on electron capture in presupernova stars
Institute of Theoretical Physics, China West Normal University, Nanchong 637002, PR China e-mail: Liumq@cwnu.edu.cn;email@example.com
Accepted: 12 October 2006
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 g/cm3.
Conclusions.The influence of screening on the electron capture reaction is about 10 percent for 56Co at g/cm3. Screening may affect the structure and evolution of presupernova and should be included in any precise simulation.
Key words: supernovae: general / nuclear reactions, nucleosynthesis, abundances / methods: numerical
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.