Measurements of the proton polarization in the reactions ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$,$p_{\mathrm{pol}}$)${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ and ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$,$p_{\mathrm{pol}}$)${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ and of the analyzing powers of the inverse reactions, initiated by polarized protons at the same c.m. energies, show significant differences which imply the failure of the polarization-analyzing-power theorem and, prima facie, of time-reversal invariance in these reactions.

• Received 8 August 1980

DOI:https://doi.org/10.1103/PhysRevLett.47.1803