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Medium effects in K+ nuclear interactions

✍ Scribed by E. Friedman; A. Gal; J. Mareš

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
808 KB
Volume
625
Category
Article
ISSN
0375-9474

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✦ Synopsis

Total (Or) and reaction (trn) 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 Vopt = te~(p)p optical potential. Self-consistency requires, for the KN in-medium t matrix, that Imten~(p) increases linearly with the average nuclear density in excess of a threshold value of 0.088 + 0.004 fm -3. The density dependence of Re tet~'(p) is studied phenomenologically, and also applying a relativistic mean field approach, by fitting to the trr and trR 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 Vopt to generate an attractive pocket at the nuclear surface is observed. (~) 1997 Elsevier Science B.V.

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