TY - JOUR
T1 - Medium effects in K+ nuclear interactions
AU - Friedman, E.
AU - Gal, A.
AU - Mareš, J.
PY - 1997/10/27
Y1 - 1997/10/27
N2 - Total (σΥ) and reaction (σR) 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 = teff(ρ)ρ optical potential. Self-consistency requires, for the KN in-medium t matrix, that Imt teff(ρ) 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 teff(ρ) is studied phenomenologically, and also applying a relativistic mean field approach, by fitting to the σT and σR 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.
AB - Total (σΥ) and reaction (σR) 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 = teff(ρ)ρ optical potential. Self-consistency requires, for the KN in-medium t matrix, that Imt teff(ρ) 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 teff(ρ) is studied phenomenologically, and also applying a relativistic mean field approach, by fitting to the σT and σR 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.
KW - K nucleus total and reaction cross sections 500-700 MeV/c on Li, C, Si, Ca
KW - Medium effects
KW - Self-consistent analysis
UR - http://www.scopus.com/inward/record.url?scp=0031588296&partnerID=8YFLogxK
U2 - 10.1016/S0375-9474(97)00484-3
DO - 10.1016/S0375-9474(97)00484-3
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AN - SCOPUS:0031588296
SN - 0375-9474
VL - 625
SP - 272
EP - 286
JO - Nuclear Physics A
JF - Nuclear Physics A
IS - 1-2
ER -