Elastic scattering on nucleons, νN → Nν, is the dominant supernova (SN) opacity source for μ and τ neutrinos. The dominant energyand number-changing processes were thought to be νe → eν and νν̄ ↔ ee until Suzuki (1993) showed that the bremsstrahlung process νν̄NN ↔ NN was actually more important. We find that for energy exchange, the related “inelastic scattering process” νNN ↔ NNν is even more e...

We present a full set of procedures to evaluate the experimental corrections needed to derive physically meaningful quantities from the measured neutron intensities in inelastic neutron-scattering experiments. Multiple-scattering corrections are evaluated by means of a Monte Carlo code, in which a combination of experimental data and the Synthetic Model is used to account for neutron-molecule i...