On KL - KS regeneration in copper

Abstract The transmission regeneration amplitude after a thick copper block has been measured. The quantity ∣ƒ(0)− ƒ (0)∣ k varies from 20.0 ± 1.4 mb at 2.75 GeV/ c to 13.6 ± 1.2 mb at 7.25 GeV/ c . Results are in agreement with optical model calculations in which real and imaginary parts of the amplitudes for single nucleon scattering are determined from forward dispersion relations and total cross-sections.