Microscopic four-cluster description of the mirror nuclei Li-9 and C-9

The C-9 and Li-9 mirror nuclei are studied in a microscopic alpha+He-3+p+p and alpha+H-3+n+n four-cluster model using the stochastic variational method. The Be-7-Li-7 and B-8-Li-8 mirror subsystems are also investigated with the same effective interaction. The calculated ground-state energies, the radii, and the densities of the nucleons are in good agreement with the experimental data. The magnetic and quadrupole moments, except for the magnetic moments of B-8 and Li-8, also reproduced well. The quadrupole moments of C-9 and Be-7 are predicted to be -5.04 e fm(2) and -6.11 e fm(2). A possibility of the existence of neutron (proton) halo structure is studied.