Physicists from the NPDGamma Experiment at the DoE’s Oak Ridge National Laboratory (ORNL) have measured the weak interaction between protons and neutrons in the atom’s core, predicted in the Standard Model that describes the elementary particles and their interactions. The findings appear in the journal Physical Review Letters (arXiv.org preprint). Blyth et al analyzed the gamma rays emitted during the NPDGamma Experiment and found parity-violating...