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Collective rotation of an oblate nucleus at very high spin

A sequence of nine almost equidistant quadrupole transitions is observed in 137 Nd. The sequence represents an extremely regular rotational band that extends to a spin of about 75 / 2 and an excitation energy of ≈ 4 . 5 MeV above yrast. Cranked mean-ﬁeld calculations of the Nilsson-Strutinsky type suggest an oblate shape for the band. They reproduce the observed I ( I + 1) dependence of the rotational energy whereas predicting a pronounced decrease in the deformation, which is the hallmark of antimagnetic rotation.