Evidence of Time-Symmetry Violation in the Interaction of Nuclear Particles.

Abstract

Measurements of the proton polarization in the 7 Li(3 He,p) 9 Be and 9 BeeHe,p) 11 B reactions and of the analyzing powers of the inverse reactions, initiated by polarized protons at the same ~~ energies, show significant differences which imply the failure of the polarization-analyzing power theorem and, "prima facie", of time-reversal invariance in these reactions.