SUBBARRIER TRANSFER-REACTIONS IN NI-58+DY-162

Measurements of few-nucleon transfer reaction probabilities and e-valu e distributions have been made with a kinematic-coincidence detector s ystem at sub-barrier energies in Ni-58 + Dy-162. Both the one-neutron pickup and one-proton stripping reaction probabilities fall off as a f unction of the distance of closest approach as expected from semiclass ical models; the measured two-neutron pickup probabilities fall off le ss steeply than expected, consistent with previous measurements. The o rigin of this ''slope anomaly'' is discussed. The measured transfer Q- value distributions are consistent with semiclassical expectations, bo th in terms of the optimum Q values (Q(opt)) and the widths of the Q-v alue distributions, except for the one-proton stripping channel Q(opt) , which is more negative than expected by approximately 3 MeV. ''Cold' ' two-neutron transfer has been observed, and the probability of the c old portion of the two-neutron transfer is in agreement with the previ ous gamma-ray measurements and calculations. No enhanced quasielastic multipair transfer is observed, in contrast to some previous measureme nts. An upper limit of P-tr < 10(4) is placed on the quasielastic four -neutron pickup channel.