By measuring the energy of recoil particles, the following data have been obtained at an incident proton energy of 796 MeV: (1) the differential cross section for proton-proton ($p-p$) elastic scattering at laboratory angles between 1.37° and 6.40°, and (2) the analyzing power for $p-p$ elastic scattering at laboratory angles between 3.13° and 6.40°. Analyses of these data have determined certain parameters characterizing the nuclear amplitude for $p-p$ elastic scattering. The ratio $\rho$ of the real to the imaginary parts of the forward $p-p$ spin independent amplitude was found to be + 0.005±0.04. The ratio $R$ of the summed moduli squared of the forward $p-p$ double spin flip scattering amplitudes to the modulus squared of the forward $p-p$ spin independent amplitude was found to be 0.16±0.03. The real and imaginary parts of the $p-p$ spin orbit scattering amplitude divided by $sin\theta$ were found to be 0.72±0.05 and 0.18±0.11 fm, respectively. These values are compared with results of recent phase-shift analyses and forward dispersion relation calculations.

NUCLEAR REACTIONS ${}_{}{}^1{}_{}{}^{}\mathrm{H}$($p$,$p$)${}_{}{}^1{}_{}{}^{}\mathrm{H}$, $E=796\mathrm{}$ MeV, measured $\sigma \mathrm{}\left(t\right)\mathrm{}$ and $A_y\mathrm{}\left(t\right)\mathrm{}$.

• Received 4 May 1981

DOI:https://doi.org/10.1103/PhysRevC.25.373