ONE-NUCLEON AND 2-NUCLEON TRANSFER IN THE SI-28-68 SYSTEM AT ENERGIESBELOW THE COULOMB BARRIER(ZN)

Excitation functions for one-and two-nucleon transfer in Si-28 + Zn-68 system have been measured at energies below the Coulomb barrier. The experiment was carried out by detecting the forward recoiling targetli ke nuclei using the recoil mass separator, HIRA. With a pulsed beam, t he time-of-flight of the recoils was measured and used to resolve the M/q ambiguity. This enabled the determination of the two-nucleon trans fer yields. The role of one-and two-nucleon transfer in the sub-barrie r fusion cross-section enhancement has been investigated. It turns out that the coupling of the positive e-value two-neutron transfer channe l results in a significant contribution to the enhancement. Coupling t o both the transfer and the inelastic channels is able to explain the observed enhancement.