REDUCTION OF WEAK INTERACTION RATES IN THE SUPERNOVA CORE

We reinvestigate the effects of nucleon-nucleon interactions on the se mileptonic weak processes that control the neutrino physics in a super nova core. We find clear evidence that any spin or isospin dependent i nteractions act to reduce the weak interaction rates. Taking the effec ts of the single pion exchange force as an example, we find large redu ctions over the whole range of conditions that prevail from the inner core to the neutrino photosphere.