A Hartree-Fock oriented study of the effective interactions in the mass region $A=16-80\mathrm{}$ reveals that, quite contrary to the widely held belief, their like-particle parts have almost the same deformation-producing character as their neutron-proton parts. The result is consistent with the relatively recent observations concerning the dramatic onset of large deformations in the highly neutron-rich Zr isotopes.

NUCLEAR STRUCTURE Study of the deformation-producing tendency of the like-particle interactions; Hartree-Fock framework; absence of rotational features in neutron-excess nuclei in the $2s-1d$ and $2p-1f$ shells; role of single-particle energies; onset of large deformations in highly neutron-rich zirconium isotopes; cranked Hartree-Fock calculations in the nuclei ${}_{}{}^{100,102}{}_{}{}^{}\mathrm{Zr}$.

• Received 6 April 1981

DOI:https://doi.org/10.1103/PhysRevC.24.2715