Excitation functions of proton-proton elastic scattering cross sections have been measured in narrow steps for projectile momenta $p_p$ (energies $T_p$) from $1100$ to $3300\mathrm{MeV}/c$ (500 to 2500 MeV) in the angular range $35°\le {\Theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}\le 90°$ with a detector providing $\Delta {\Theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}\approx 1.4°$ resolution. Measurements have been performed continuously during projectile acceleration in the cooler synchrotron COSY with an internal ${\mathrm{CH}}_2$ fiber target, taking particular care to monitor luminosity as a function of $T_p$. The advantages of this experimental technique are demonstrated, and the excitation functions obtained are compared to existing cross section data. No evidence for narrow structures was found.

• Received 8 November 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.1652