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The observed almost complete dominance of prolate over oblate deformations inthe ground states of deformed even-even nuclei is related to the splitting ofhigh $\ell$ "surface" orbits in the Nilsson diagram: on the oblate side theoccurrence of numerous strongly avoided crossings which reduce the fanning outof the low $\Lambda$ orbits, while on the prolate side the same interactionsincrease the fanning out. It is further demonstrated that the prolate dominanceis rather special for the restricted particle number of available nuclei and isnot generic for finite systems with mean-field potentials resembling those inatomic nuclei.

A further look at prolate dominance in nuclear deformation