The ${}_{}{}^9{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ mirror nuclei are studied in a microscopic α${+}^3$He+p+p and α${+}^3$H+n+n four-cluster model using the stochastic variational method. The ${}_{}{}^7{}_{}{}^{}\mathrm{-}_{}^7{}_{}{}^{}$Li and ${}_{}{}^8{}_{}{}^{}\mathrm{-}_{}^8{}_{}{}^{}$Li 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 ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ and ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$, are also reproduced well. The quadrupole moments of ${}_{}{}^9{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ are predicted to be -5.04 e${\mathrm{fm}}^2$ and -6.11 e${\mathrm{fm}}^2$. A possibility of the existence of neutron (proton) halo structure is studied.

• Received 24 May 1995

DOI:https://doi.org/10.1103/PhysRevC.52.3013