POSITIVE PARITY ISOVECTOR COLLECTIVE STATES IN DEFORMED-NUCLEI

A model is developed for deformed nuclei in which their constituents, protons and neutrons, are described as axially symmetric rigid bodies. These two rotors, being free to rotate separately and interacting through a harmonic potential, perform intrinsic rotational oscillations with opposite phases about a common axis. The dynamical system so composed does not possess axial symmetry. Its lowest-lying excited states which can be excited by electromagnetic radiation are two in number and have both an excitation energy of ≈ 10 MeV in heavy deformed nuclei. One of them is strongly excited by isovector magnetic dipole radiation, the other is weakly excited by electric quadrupole radiation. © 1979.