Measurement of punch-through particle fluxes from a 200 cm long beam dump hit by a 300 gev/c pion beam

Abstract We present a measurement of the particle flux punching through tungsten and iron beam dumps; the NA3 spectrometer was used. Momentum spectra and spatial distributions were determined for pions above GeV/ c and for strange particles (K ± , K s 0 , Λ , Ξ ; 15 p c ). Information on the effective attenuation length for strange particles was obtained by comparing the results from dumps of different lengths (200 and 220 cm).