We present $p-p$ elastic differential cross-section results at nine momenta in the range 1.5 to 3.5 GeV/c for $40°\lesssim {\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}<~90°$. No strong evidence of secondary diffraction-like behavior in this momentum region is observed. Rapid changes in the slope of the 90° cross section are seen near $-t=0.7\mathrm{} \mathrm{and} 3$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$.

• Received 15 November 1969

DOI:https://doi.org/10.1103/PhysRevLett.23.1306