Measurements of few-nucleon transfer reaction probabilities and Q-value distributions have been made with a kinematic-coincidence detector system at sub-barrier energies in ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ + ${}_{}{}^{162}{}_{}{}^{}\mathrm{Dy}$. Both the one-neutron pickup and one-proton stripping reaction probabilities fall off as a function of the distance of closest approach as expected from semiclassical models; the measured two-neutron pickup probabilities fall off less steeply than expected, consistent with previous measurements. The origin of this ‘‘slope anomaly’’ is discussed. The measured transfer Q-value distributions are consistent with semiclassical expectations, both in terms of the optimum Q values (${\mathit{Q}}_{\mathrm{opt}}$) and the widths of the Q-value distributions, except for the one-proton stripping channel ${\mathit{Q}}_{\mathrm{opt}}$, which is more negative than expected by approximately 3 MeV. ‘‘Cold’’ two-neutron transfer has been observed, and the probability of the cold portion of the two-neutron transfer is in agreement with the previous γ-ray measurements and calculations. No enhanced quasielastic multipair transfer is observed, in contrast to some previous measurements. An upper limit of ${\mathit{P}}_{\mathrm{tr}}$<${10}^4$ is placed on the quasielastic four-neutron pickup channel. © 1996 The American Physical Society.

• Received 28 November 1995

DOI:https://doi.org/10.1103/PhysRevC.53.2900