MORSE: present capabilities and future directions

The MORSE (Multigroup Oak Ridge Stochastic Experiment) Monte Carlo code is a three-dimensional (3D) multipurpose neutron and gamma-ray transport code that has been in use for nearly 30 years and has undergone several evolutions during that time. This article will describe the current capabilities and the future directions of the two versions that are distributed by Oak Ridge National Laboratory: MORSE-SGC and MORSE-CGA. MORSE-SGC is part of the SCALE computer code system, both as a stand-alone program and as part of two of the shielding analysis sequences. MORSE-CGA differs from MORSE-SGC in its cross-section handling and in its requirement for user-supplied analysis routines.