Anomalous signature splitting effects in 79Rb

Abstract

In 79Rb the experimentally observed π g 9 2 band behaves in an unexpected way above the first band crossing. It has a large energetic signature splitting, but shows no corresponding signature splitting in the angular momentum. Cranking model calculations give a plausible explanation of this phenomenon in terms of different deformations for the two signatures of the g 9 2 band. The calculations also give a good description of the neighbouring nuclei 78Kr, 80Sr and 77,81Rb which all have very different properties.