REDUCTION OF WEAK INTERACTION RATES IN THE SUPERNOVA CORE

We reinvestigate the effects of nucleon-nucleon interactions on the semileptonic weak processes that control the neutrino physics in a supernova core. We find clear evidence that any spin or isospin dependent interactions act to reduce the weak interaction rates. Taking the effects of the single pion exchange force as an example, we find large reductions over the whole range of conditions that prevail from the inner core to the neutrino photosphere.