It is demonstrated that the partition of excitation energy between receptor and donor, in quasielastic heavy-ion transfer reactions, at near barrier energies can be studied by γ-ray spectroscopy. Reactions between ${}_{}{}^{161}{}_{}{}^{}\mathrm{Dy}$ and ${}_{}{}^{58,61}{}_{}{}^{}\mathrm{Ni}$ at bombarding energies 265 and 270 MeV respectively have been studied using the particle-γ coincidence technique. From the observed deexcitation γ rays originating in Ni, we derived the average excitation energy carried by the receptor to be ∼0.8 MeV (${\mathit{Q}}_{\mathit{g}\mathit{g}}$=2.5 MeV) for ${}_{}{}^{59}{}_{}{}^{}\mathrm{Ni}$ and ∼2.5 MeV (${\mathit{Q}}_{\mathit{g}\mathit{g}}$=4.1 MeV) for ${}_{}{}^{62}{}_{}{}^{}\mathrm{Ni}$ in the one-neutron transfer reaction channel. A broad bump peaking about 1 MeV attributed to intrinsic excitation was observed in ${}_{}{}^{160}{}_{}{}^{}\mathrm{Dy}$ for the ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ beam and about 1–2 MeV for the ${}_{}{}^{61}{}_{}{}^{}\mathrm{Ni}$ beam. Distorted-wave Born approximation analysis reproduces the general features of the excitation-energy partition between the receptor and donor although discrepancies exist when comparing populations of individual final states.

• Received 25 August 1994

DOI:https://doi.org/10.1103/PhysRevC.51.173