PREFERRED SHAPES AND MODES OF INTERNAL MOTION IN A SYSTEM OF 4 IDENTICAL FERMIONS

The 0(+) and 0(-) states of a model fermion system with symmetric and antisymmetric spatial permutation symmetry have been investigated. The pairwise interaction adopted has a repulsive core and an attractive t ail. Evidences on the preferred shapes and on modes of internal motion s have been extracted from the wave functions. A comparison is made am ong the states having even or odd parity and being symmetric or antisy mmetric. It is found that the symmetry plays an essential role in dete rmining the microscopic structures.