  We study effects of the antisymmetrization on the potential energy of
two-cluster systems. The object of the investigation is the lightest nuclei of
p-shell with a dominant alpha-cluster channel. For this aim we construct matrix
elements of two-cluster potential energy between cluster oscillator functions
with and without full antisymmetrization. Eigenvalues and eigenfunctions of the
potential energy matrix are studied in detail. Eigenfunctions of the potential
energy operator are presented in oscillator, coordinate and momentum spaces. We
demonstrate that the Pauli principle affects more strongly the eigenfunctions
than the eigenvalues of the matrix and leads to the formation of resonance and
trapped states.
