Simulation and Performance of~Radiation Shielding for~Recent and Future~Parity-Violating Electron Scattering~Experiments~at~Jefferson Lab~

The parity-violating asymmetry resulting from~the~weak interaction,~when a longitudinally polarized electron beam is scattered from an unpolarized target,~can be used to probe nuclear structure~or to~test the limits of~the~Standard Model. The~PREX-2~and~CREX~experiments used~1 GeV and 2.2~GeV~electron~beams respectively,~elastically scattering from the Pb-208 and Ca-48 nuclei to~measure the neutron skins that constrain the nuclear symmetry energy and~models of nuclear structure.~MOLLER is~a~future experiment~that will~scatter~an~11 GeV electron beam from atomic electrons in a liquid Hydrogen target~to measure the electroweak mixing~angle and~compare against Standard Model predictions as an indirect search for new physics.~Such a search is~currently beyond the energy scale reachable by direct searches.~An important aspect of the experimental design~is radiation shielding optimization to~suppress physics backgrounds~and~mitigate damage to the experimental~instruments~and hall infrastructure. This talk summarizes~the optimization studies~currently underway for MOLLER,~particularly discussing the effects~on collimators, magnets, detectors,~and experimental hall;~considering~the lessons learned from simulation and performance of radiation shielding for the PREX-2/CREX experiments.