Rotation-driven prolate-to-oblate shape phase transition in 190W: A projected shell model study

A shape phase transition is demonstrated to occur in 190W by applying the projected shell model, which goes beyond the usual mean-field approximation. Rotation alignment of neutrons in the high-j, i13/2 orbital drives the yrast sequence of the system, changing suddenly from prolate to oblate shape at angular momentum 10ℏ. We propose observables to test the picture.