Improving Evaluations of Neutron Induced Gamma Ray Production: Upgrading ENDF, Formatting and Reaction Models

This paper describes part of the joint efforts of Brookhaven National Laboratory, Lawrence Livermore National Laboratory, and Lawrence Berkeley National Laboratory to revise the gamma production library in ENDF/B-VIII.0 modeling in transport codes under the Gamma Rays Induced by Neutrons (GRIN) project. Simulation modelling support and event-by-event calculations are addressed. The improvements enable a better modelling of particle-gamma and gamma-gamma coincidences and provide significant upgrades to the ENDF/B library, data format, and reaction models.