CAN 55Co GIVE US THE DESIRED PROMPT EXPLOSION OF MASSIVE STARS

摘要

Core collapse simulators are striving hard to achieve prompt explosion of a collapsing core of a massive star Various parameters need to be fed into the simulation code before results of such a complex problem emerge. The most important nuclear physics input parameters to such codes include weak interaction rates (electron capture and beta decay rates) of key nuclides So far, the weak rates fed into the code resulted in an undesired delayed explosion Simulators attribute this result partly to somewhat suppressed election capture rates of these key nuclides. Recently I calculated election capture rates of these key nuclides using the proton-neutron quasi-particle random phase approximation (pn-QRPA) theory in a microscopic fashion. The microscopic results of QRPA certainly yield more enhanced rates for these nuclides S5Co is not only present in abundance in presupernova phase but is also advocated to play a decisive role in the core collapse of massive stars. The important question to ask is 'can QRPA rates contribute to triggering a prompt explosion?'