Electron capture of strongly screening nuclides 56Fe, 56Co, 56Ni, 56Mn,56Cr and 56V in pre-supernovae

According to the shell-model Monte Carlo method, based on the random-phase approximation and linear response theory, we carried out an estimation of electron capture (EC) of the strongly screening nuclides Fe-56, Co-56, Ni-56, Mn-56,Cr-56 and V-56 during strong electron screening (SES) in pre-supernovae. The EC rates are decreased greatly and may even exceed 21.5 per cent in the case of SES. We also compare our results with those calculated by the method of Aufderheide in the case of SES. Our results agree reasonably well with those of Aufderheide in higher density and temperature surroundings (e.g. (7) > 60, T-9 = 15.40) and the maximum error is similar to 0.5 per cent. However, the maximum error is similar to 13.0 per cent in lower density surroundings (e.g. Cr-56 at (7) = 10, T-9 = 15.40, Y-e = 0.41). We also compared our results for SES with those of Fuller, Fowler & Newman and Nabi, which apply to a case without SES. The comparisons show that our results are lower than those of Fuller, Fowler & Newman by more than one order of magnitude and about 7.23 per cent lower than those of Nabi.