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rp-process weak-interaction mediated rates of waiting-point nuclei

机译：rp-过程弱相互作用介导的等待点核速率

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Electron capture and positron decay rates are calculated for neutron-deficient Kr and Sr waiting point nuclei in stellar matter. The calculation is performed within the framework of pn-QRPA model for rp-process conditions. Fine tuning of particle-particle, particle-hole interaction parameters and a proper choice of the deformation parameter resulted in an accurate reproduction of the measured half-lives. The same model parameters were used to calculate stellar rates. Inclusion of measured Gamow-Teller strength distributions finally led to a reliable calculation of weak rates that reproduced the measured half-lives well under limiting conditions. For the rp-process conditions, electron capture and positron decay rates on 72Kr and 76Sr are of comparable magnitude whereas electron capture rates on 78Sr and 74Kr are 1–2 orders of magnitude bigger than the corresponding positron decay rates. The pn-QRPA calculated electron capture rates on 74Kr are bigger than previously calculated. The present calculation strongly suggests that, under rp-process conditions, electron capture rates form an integral part of weak-interaction mediated rates and should not be neglected in nuclear reaction network calculations as done previously.
机译：计算了恒星物质中缺乏中子的Kr和Sr等待点核的电子俘获率和正电子衰减率。该计算是在rp-process条件的pn-QRPA模型框架内执行的。微粒-微粒，微粒-孔相互作用参数的微调以及变形参数的正确选择导致了所测得的半衰期的精确再现。相同的模型参数用于计算恒星率。包含测量的Gamow-Teller强度分布最终导致可靠地计算了弱速率，从而在极限条件下很好地再现了测量的半衰期。对于rp工艺条件， 72 Kr和 76 Sr上的电子俘获率和正电子衰减率具有可比的幅度，而 78 上的电子俘获率具有可比性Sr和 74 Kr比相应的正电子衰减率大1–2个数量级。 pn-QRPA在 74 Kr上计算出的电子俘获率比以前计算的要大。本计算强烈表明，在rp工艺条件下，电子俘获速率是弱相互作用介导速率的组成部分，不应像以前所做的那样在核反应网络计算中予以忽略。

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