Abstract
The isomeric states in Po, At and Rn isotopes are described as independent particle states in a deformed potential which is symmetric with respect to the direction of the angular momentum. The known parts of the yrast lines of these nuclei are found to be well described by the model. In particular all observed isomeric states are reproduced as “traps”. The variation of the shape along the yrast line is studied. In most of the nuclei considered a gradual rise of oblate deformation takes place. This can be understood from simple qualitative considerations. The relation of the present approach to a description within the spherical shell model with residual interactions is discussed.
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