Measurement of the Triple Scattering ParameterR′at 213 MeV

In a continuation of the study of the nucleon-nucleon interaction, a combination of the triple scattering parameters $R$ and $R^{\prime }$ in proton-proton scattering at 213 MeV was measured in the angular range 30-90° c.m. By using an earlier measurement of $R$, values of $R^{\prime }$ have been obtained. The data are compared to predictions given by the Hamada-Johnston potential model and by a modified phase-shift analysis using all previously measured data.