Possible Time-Reversal Noninvariance in Nuclear Forces

A model suggested by Sudarshan which relates strong, weak, and electromagnetic interactions through vector and axial-vector currents is adapted to nucleon-nucleon scattering. Strong time-reversal violation is predicted in $n-p$ scattering above 100 MeV through the same mechanism assumed to cause $\mathrm{CP}$-invariance violation in weak hadronic decays. Where a $T$-invariance violation has been sought for and not found, i.e., in $p-p$ scattering up to 635 MeV and low-energy $n-p$ scattering, the model predicts very little $T$-invariance violation.