TY - RPRT TI - OpenSn: A massively parallel, open-source simulation environment for discrete ordinates radiation transport AU - Andrs, David [Sawtooth Simulations LLC, Idaho Falls, ID (United States)] (ORCID:000000028913902X) AU - Hardy, Zachary Kenneth [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000285499968) AU - Hawkins, Daryl [Texas A & M Univ., College Station, TX (United States)] (ORCID:0009000895278617) AU - Morel, Jim E. [Texas A & M Univ., College Station, TX (United States)] (ORCID:000000017723003X) AU - Nguyen, Dinh Quoc Dang [Texas A & M Univ., College Station, TX (United States)] (ORCID:000900067601534X) AU - Ragusa, Jean C. [Texas A & M Univ., College Station, TX (United States)] (ORCID:0000000198706447) PY - 2025 DO - 10.1016/j.cpc.2025.110001 UR - https://www.osti.gov/biblio/3021582 ID - 3021582 ER -