Measurement of Pion and Kaon Fluxes Below 60 GeV/c Produced by 450~GeV/c Protons on a Beryllium Target The SPY Collaboration

% NA56 \\ \\ We propose to perform a measurement of the production rates of $\pi$'s and K's and their ratio below 60~GeV/c from 450~GeV/c protons hitting a Be target. These data are of great importance for the correct evaluation of the neutrino flux at the present and future SPS neutrino experiments. The apparatus of the NA52 experiment has the capability of performing the measurement, using about two weeks of proton beam time and a target closely resembling the one used in the current SPS neutrino beam line.