Delayed alignment in the N = Z nucleus 72Kr

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

“…These gross features are consistent with available experimental data [60][61][62][63][64][65][66] and previous theoretical calculations [19,21,22,49,[67][68][69][70][71][72][73][74][75][76][77].…”

“…The solutions of the Skyrme-HFB equations obtained in the numerical calculations for 64 Ge, 68 80 Zr and 84 Mo, we obtain two or three local minima close in energy, indicating shape coexistence. These gross features are consistent with available experimental data [60][61][62][63][64][65][66] and previous theoretical calculations [19,21,22,49,[67][68][69][70][71][72][73][74][75][76][77].…”

“…As a result of the Skyrme-HFB calculations for proton-rich N = Z nuclei from 64 Ge to 84 Mo (summarized in Table 1), we have found equilibrium shapes with finite non-axial octupole deformations for 68 Se and 80 Zr. The density distribution at the HFB local minimum for 68 Se with the triangular deformation superposed on the oblate shape and that for 80 Zr with the tetrahedral deformation are illustrated in Fig.…”

“…We have constructed a new computer code that carries out Skyrme-HFB calculations in the 3-dimensional Cartesian-mesh space without imposing any restriction on the spatial symmetry, and investigated shape coexistence and non-axial octupole deformations in proton-rich N = Z nuclei, 64 Ge, 68 [21,22] on the basis of the Skyrme-HF plus BCS calculations, have been confirmed by the fully selfconsistent Skyrme-HFB calculations with the use of the density-dependent zero-range pairing interaction.…”

“…2, the calculated potential energy curve for 64 Ge is rather shallow with respect to the γ degree of freedom so that this nucleus may be regarded as "γ-soft." This result is consistent with the experimental indication [60] and also with the shell model calculation by the Monte Carlo diagonalization method [75].…”