Observation of oscillations and near-barrier suppression in the fusion of 20O + p
Abstract
Using an active target detector, the fusion excitation function for 20O + 1H was measured for the first time. Near the barrier, the fusion cross section manifests an oscillatory behavior with broad peaks 50-100 keV wide. The presence of these peaks likely reflects the low density of low-angular-momentum states in the quasibound regime. R-matrix coupled channel (CC) calculations that include the first excited 2+ state in 20O are able to reproduce the observed oscillations. However, one channel CC calculations fail to reproduce the decrease in the sub-barrier cross section experimentally observed.
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