标题： 55Co和56Ni的超新星电子捕获率 显示英文标题

标题： Supernova electron capture rates for 55Co and 56Ni

摘要： 我们计算了55Co和56Ni基态和第一激发态的伽莫夫-泰勒强度分布。这些计算是在pf壳层中通过壳模型对角化使用KB3相互作用进行的。伽莫夫-泰勒分布用于计算典型超新星前条件下的电子捕获率。我们的55Co速率明显小于目前采用的速率，因为它主要由弱的低能跃迁主导，而不是通常参数化的强伽莫夫-泰勒（GT）共振，该共振在子核中位于更高的激发能级。尽管我们的56Ni速率与目前采用的速率一致，但我们无法确认传统的GT中心参数化。我们的结果支持基于壳模型蒙特卡罗计算提出的总体趋势。 显示英文摘要

摘要： We have calculated the Gamow-Teller strength distributions for the ground states and first excited states in 55Co and 56Ni. These calculations have been performed by shell model diagonalization in the pf shell using the KB3 interaction. The Gamow-Teller distributions are used to calculate the electron capture rates for typical presupernova conditions. Our 55Co rate is noticeably smaller than the presently adopted rate as it is dominated by weak low-lying transitions rather than the strong Gamow-Teller (GT) resonance which is located at a higher excitation energy in the daughter than usually parametrized. Although our 56Ni rate agrees with the presently adopted rate, we do not confirm the conventional parametrization of the GT centroid. Our results support general trends suggested on the basis of shell model Monte Carlo calculations.