A U-QP(U(2)) ROTOR MODEL FOR ROTATIONAL BANDS OF SUPERDEFORMED NUCLEI

A nonrigid rotor model is developed from the two-parameter quantum alg ebra U-qp(u(2)). (This model presents the U-qp(u(2)) symmetry and shal l be refered to as the qp-rotor model.) A rotational energy formula as well as a qp-deformation of E2 reduced transition probabilities are d erived. The qp-rotor model is applied (through fitting procedures) to twenty rotational bands of superdeformed nuclei in the A similar to 13 0, 150, and 190 mass regions. Systematic comparisons between the qp-ro tor model and the q-rotor model of Raychev, Roussev, and Smirnov, on o ne hand, and a basic three-parameter model, on the other, are performe d on energy spectra, on dynamical moments of inertia and on B(E2) valu es. The physical significance of the deformation parameters q and p is discussed.