Medium effects in K^+ nuclear interactions

Abstract

Total and reaction cross sections are derived self consistently from the attenuation cross sections measured in transmission experiments at the AGS for K^+ on Li^6, C, Si and Ca in the momentum range of 500-700 MeV/c by using a V_{opt}=t_{eff}(rho)rho optical potential. Self consistency requires, for the KN in-medium t matrix, that Im t_{eff}(rho) 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 t_{eff}(rho) is studied phenomenologically, and also applying a relativistic mean field approach, by fitting the integral cross sections. 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 Li^6 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.

23 pages, RevTeX, 2 postscript figures, submitted Nucl. Phys. A

References in corpus (7)

• Chiral Dynamics and the Low Energy Kaon-Nucleon Interaction
• Hyperon-rich Matter in Neutron Stars
• Constraints on $\Sigma$ Nucleus Dynamics from Dirac Phenomenology of ${\Sigma }^{-}$ Atoms
• From Chiral Mean Field to Walecka Mean Field and Kaon Condensation
• Pion Cloud Contribution to K+ Nucleus Scattering
• Medium effects in K^+ nucleus interaction from consistent analysis of integral and differential cross sections
• RPA calculation of $K^{+}$-nucleus cross-sections with a density-dependent Brueckner-Hartree-Fock NN interaction

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• $K^{-}/K^{+}$ ratios in relativistic heavy-ion collisions
• Traces of Theta^+ pentaquark in K^+ nucleus dynamics
• Room for an S = +1 pentaquark in K^+ - nucleus phenomenology
• The effect of the in-medium ${\Theta }^{+}$ pentaquark on the kaon optical potential
• Linear representation of energy-dependent Hamiltonians
• $K^{+}$-nucleus potentials from $K^{+}$-nucleon amplitudes
• Microscopic analysis of K^+-nucleus elastic scattering based on K^+N phase shifts