Abstract
Fusion-evaporation cross sections have been measured for {sup 32,36}S+{sup 110}Pd to high accuracy in the energy range around the Coulomb barrier. The two extracted fusion barrier distributions display very similar structures with two well-resolved peaks below the nominal barrier, which are consistent with a model calculation including the coupling of the one-, two-, and three-phonon collective vibrations of {sup 110}Pd. A third lower-energy barrier, together with a strong relative cross section enhancement, is observed for {sup 32}S+{sup 110}Pd, and is reproduced by coupling the two-neutron pickup channel which has a large and positive ground state {ital Q} value (+5.1 MeV). For {sup 36}S+{sup 110}Pd, the calculated effect of the corresponding transfer channel (with negative {ital Q} value) is much smaller.
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