Abstract
Total ( σ T ) and reaction ( σ R ) cross sections are derived self-consistently from the attenuation cross sections measured in transmission experiments at the AGS for K + on 6Li, C, Si and Ca in the momentum range of 500–700 MeV/ c by using a V opt = t eff( ϱ) ϱ optical potential. Self-consistency requires, for the KN in-medium t matrǐx, that Im t eff( ϱ) increases linearly withd the average nuclear density in excess of a threshold value of 0.088±0.004 fm −3. The density dependence of Re t eff( ϱ) is studied phenomenologically, and also applying a relativistic mean field approach, by fitting to the σ T and σ R values. The real part of the optical potential is found to be systematically less repulsive with increasing energy than expected from the free-space repulsive KN interaction. When the elastic scattering data for 6Li and C at 715 MeV/ c are included in the analysis, a tendency of Re V opt to generate an attractive pocket at the nuclear surface is observed.
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