Neutrinos, Weak Interactions, and r-process Nucleosynthesis
  Two of the key issues in understanding the neutron-to-proton ratio in a core-collapse supernova are discussed. One of these is the behavior of the neutrino-nucleon cross sections as supernova energies. The other issue is the many-body properties of the neutrino gas near the core when both one- and two-body interaction terms are included. 
A.B. Balantekin (Wisconsin U., Madison)