The Jefferson Lab PRad-II and X17 Experiments

The PRad Collaboration will run two new experiments, PRad-II and X17, in Hall B at Jefferson lab from February through July 2026. These experiments will make use of the unique magnet-free, far-forward PRad spectrometer, consisting of two GEM planes and a calorimeter. PRad-II is the successor to the highly successful PRad experiment and will report the highest precision proton charge radius extraction from lepton scattering. The experiment aims to resolve the "proton radius puzzle" and to achieve the lowest Q² measurement of elastic electron-proton scattering. The X17 experiment will resolve the X17/Beryllium-8 anomaly observed at the ATOMKI Van de Graaff accelerator. The experiment will be able to test the dark photon and "protophobic" boson hypotheses using a "Bremsstrahlung-like" process to produce any existing hidden sector bosons. This talk will discuss the motivation, techniques, and projected results of these two upcoming experiments.