  Existing measurements of the angular distributions of the ground-state to
ground-state transitions of the 12C(d,p)13C and 13C(p,d)12C neutron-transfer
reactions have been analyzed systematically using the Johnson-Soper adiabatic
and distorted-wave theories. When using a consistent set of physical inputs the
deduced spectroscopic factors are consistent to within 20% for incident
deuteron energies from 6 to 60 MeV. By contrast, original analyses of many of
these data quoted spectroscopic factors that differed by up to a factor of
five. The present analysis provides an important reference point from which to
assess the requirements of future spectroscopic analyses of transfer reactions
measured in inverse kinematics using rare nuclei.
