2014/02/04 by G. Martínez-Pinedo, Y. H. Lam, K. Langanke +2 · 1 citation
Physics and Astronomy · #astro-ph.HE #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.89.045806
21 pages, 12 figures
arxiv created 2014/02/04 · arxiv updated 2015/06/18
We have evaluated the electron capture rates on 20Ne, 20F, 24Mg, 24Na and the β decay rates for 20F and 24Na at temperature and density conditions relevant for the late-evolution stages of stars with M=8-12 M_\odot. The rates are based on recent experimental data and large-scale shell model calculations. We show that the electron capture rates on 20Ne, 24Mg and the 20F, 24Na β-decay rates are based on data in this astrophysical range, except for the capture rate on 20Ne, which we predict to have a dominating contribution from the second-forbidden transition between the 20Ne and 20F ground states in the density range log ρYe (g~cm-3) = 9.3-9.6. The dominance of a few individual transitions allows us to present the various rates by analytical expressions at the relevant astrophysical conditions. We also derive the screening corrections to the rates.