Two-Neutron Transfer Reactions on Rare-Earth Nuclei

The angular-momentum projection method is applied to the description of ($t,p$) and ($p,t$) reactions on deformed nuclei. The difference between the deformations of a target nucleus and that of a residual nucleus is taken into account in the calculation of the spectroscopic amplitude. The calculation is especially focused on the ground-state to ground-state ($p,t$) transitions. The neutron-number dependence of the calculated distorted-wave Born-approximation cross sections is in good agreement with the experimental results.