MULTIBAND THEORY FOR HEAVY-ION NEUTRON-PAIR TRANSFER AMONG DEFORMED GD NUCLEI

In this paper our microscopic wave functions for Gd isotopes are appli ed to calculating neutron-pair transfer probabilities in heavy-ion col lisions. The similar to 2600-term wave functions come from Hamiltonian matrix diagonalization of systems of 12 Nilsson neutron orbitals, nea rly half-filled. We use the lowest five bands in initial and final nuc lei and calculate transfer for all even spins from 0 through 30. Resul ts for the sudden approximation (infinite moment-of-inertia) for neutr on-pair extraction from Gd-156 by Ni-58 at near Coulomb barrier energy , and extraction by Pb-206 are shown. Next neutron-pair deposition by the Ni and Pb projectiles is calculated. Finally, a finite moment-of-i nertia semiclassical calculation is formulated and performed on the Gd -156 + Pb-206 system for n-pair transfer in both directions. The resul ts are compared with experimental results. It is clear that the inclus ion of the additional bands above the lowest two is important. Theory and experiment agree qualitatively on the rise of population above the yrast line at higher spins.