The $p-p$ differential cross section has been remeasured at 52.3 MeV within 1% accuracy by Sanada et al. We have made a phase-shift analysis by using these new data and those on $C_{\mathrm{nn}}$, $C_{\mathrm{kp}}$, $P$, $D$, $R$, and $A$. All of these data were normalized at 50.0 MeV. The solution is ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{} 39.00\pm 0.35$, ${}_{}{}^1{}_{}{}^{}D_2^{}{}_{}{}^{} 1.97\pm 0.15$, ${}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{} 12.57\pm 0.52$, ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{} -7.86\mathrm{}\pm 0.27$, ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{} 5.98\pm 0.13$, ${\epsilon }_2 -1.90\mathrm{}\pm 0.19$, ${}_{}{}^3{}_{}{}^{}F_2^{}{}_{}{}^{} 0.43\pm 0.18$ (in degrees). The present solution shows that the parameters ${\epsilon }_2$ and $\delta \left({}_{}{}^3{}_{}{}^{}F_2^{}{}_{}{}^{}\right)$ are given essentially by the OPE forces. Other features of the solution are similar to those of the previous one. The values of the $\delta \left({}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}\right)$ and $\delta \left({}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}\right)$ of the present solution are larger by about three standard deviations than those given from the Hamada-Johnston potential.

DOI:https://doi.org/10.1103/RevModPhys.39.548