A MODEL OF NUCLEAR ROTATION

We construct a model which describes approximately ground-state, super deformed and fission-isomeric rotational bands of even-even nuclei. Th e model is based on a three-term energy expression corresponding to: ( a) a rigid rotation of part of the nucleus, (b) the energy of initiall y counter-rotating gyroscopes that the overall rotation gradually alig ns in the direction of the total angular momentum, and (c) a potential energy resisting such alignment. The model can be used for a macrosco pic description of the angular momentum dependence of nuclear fission barriers. (C) 1998 Published by Elsevier Science B.V.