Rates of Neutrino Absorption on Nucleons and the Reverse Processes in   Strong Magnetic Fields
  The rates of electron neutrino capture on neutron, electron anti-neutrino capture on proton, and their reverse processes are important for understanding the production of heavy elements in the supernova environment above the protoneutron star. Observations and theoretical considerations suggest that some protoneutron stars may be born with strong magnetic fields. We develop a numerical method to calculate the above rates in supernova environments with magnetic fields up to 10^16 G. This method is accurate to the order of one over nucleon mass. We show that our results have the correct behavior in the limit of high neutrino energy or small magnetic field. Based on comparison of our results with various approximations, we recommend efficient estimates of the above rates for use in models of supernova nucleosynthesis in the presence of strong magnetic fields. 
Huaiyu Duan and Yong-Zhong Qian (University of Minnesota)