SUPERDEFORMED ROTATIONAL BANDS WITH DENSITY-DEPENDENT PAIRING INTERACTIONS

The cranked Hartree-Fock-Bogoliubov method, applied in a previous study to SD bands of even tig and Pb isotopes, is extended by including pairing correlations described by a zero-range density-dependent interaction. This more realistic description of the pairing channel modifies the balance between the neutron and proton pairing energies and introduces an orbital variation of the pairing gaps. This results in a retarded alignment, significantly improving the agreement with data in both the A = 150 and 190 mass regions. The behavior expected for SD bands in odd-N or odd-Z nuclei is discussed on the basis of the quasiparticle routhians calculated for the even-even isotopes.