Symmetry-unrestricted Skyrme-Hartree-Fock-Bogoliubov calculations for exotic shapes in N = Z nuclei from 64Ge to 84Mo

By performing fully 3D symmetry-unrestricted Skyrme-Hartree-Fock-Bogoliubov calculations, we discuss shape coexistence and possibility of exotic deformations simultaneously breaking the reflection and axial symmetries in proton-rich N = Z nuclei: Ge-64, Se-68, Kr-72,Sr-76, Zr-80 and Mo-84. Results of calculation indicate that the oblate ground state of Se-68 is extremely soft against the Y-33 triangular deformation, and that the low-lying spherical minimum coexisting with the prolate ground state in Zr-80 is extremely soft against the Y-32 tetrahedral deformation. (C) 2001 Elsevier Science B.V. All rights reserved.