Microscopic four-cluster description of the mirror nuclei Li9 and C9

The C9 and Li9 mirror nuclei are studied in a microscopic +3He+p+p and +3H+n+n four-cluster model using the stochastic variational method. The -77Li and -88Li 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 B8 and Li8, are also reproduced well. The quadrupole moments of C9 and Be7 are predicted to be -5.04 efm2 and -6.11 efm2. A possibility of the existence of neutron (proton) halo structure is studied.