Mixed-parity Hartree-Fock calculations have been performed on the nitrogen and oxygen isotopes using (1) a central Rosenfeld interaction, (2) a Rosenfeld-plus-an-appropriate-tensor interaction, and (3) bare Kuro-Brown matrix elements. It is shown that the results for the interactions (2) and (3) are fairly close. The gain for ${\mathrm{O}}^{16}$ is found to be larger than either of its isotopes $A=15\mathrm{} \mathrm{and} 17$. This is interpreted in terms of the energy gap between the occupied and the unoccupied Hartree-Fock orbitals.

• Received 11 August 1969

DOI:https://doi.org/10.1103/PhysRev.188.1645