Shift is a massively parallel Monte Carlo radiation transport code. It features both continuous-energy and multigroup neutron and gamma physics, and supports multiple geometries, including SCALE, MCNP, and CAD geometries. It scales well from laptops to supercomputers, and is integrated with Denovo for automatic variance reduction and ORIGEN for depletion calculations.
Shift is currently distributed within the SCALE Code system available through the Radiation Safety Information Computational Center (RSICC) at https://rsicc.ornl.gov.