  The kaon energy in a nuclear medium and its dependence on kaon-nucleon and
nucleon-nucleon correlations is discussed. The transition from the Lenz
potential at low densities to the Hartree potential at high densities can be
calculated analytically by making a Wigner-Seitz cell approximation and
employing a square well potential. As the Hartree potential is less attractive
than the Lenz one, kaon condensation inside cores of neutron stars appears to
be less likely than previously estimated.
