TY - RPRT TI - Delayed Critical and Subcritical Experiments with Polyethylene Moderated Unreflected Thin 15 in. Diameter HEU Metal Plates AU - Mihalczo, John T. PY - 2023 DO - 10.2172/1959614 UR - https://www.osti.gov/biblio/1959614 ID - 1959614 ER -