Non-axial Octupole Deformations of N = Z Nuclei in A ∼ 60 − 80 Mass Region ∗

By performing a fully three dimensional Hartree-Fock calculation with use of the Skyrm forces, we demonstrate possibility of exotic deformations violating both the reflection and the axial symmetries of N = Z nuclei in A ∼ 60 − 80 mass region. The Y32 tetrahedral shape predicted in excited Zr arises from a shell gap at N,Z = 40 which is enhanced for the tetrahedron deformation. Softness toward the Y33 triangular deformation of the oblate state in Se is also predicted. A talk presented by M.M. at Nuclear Structure ’98, Gatlinburg, August 10-15, 1998