Effect of multiphonon coupling on heavy-ion fusion

Nuclear reactions studied by quasi-elastic measurements with high precision at backward angles

“…A collimated 16 O beam with incident energies in the range from 36 to 82 MeV bombarded the targets. The bombarding energies were varied in steps of 3 MeV at the very low energies and in steps of 0.75 MeV at the high energies.…”

“…The background counts in the spectra are almost non-existent due to the collimator in the exit tube, which prevents the back-scattering products from the Faraday cup into the backward detectors. After careful analyses, the excitation functions of quasi-elastic scatterings for 16 Fig. 2.…”

“…Fig. 1 The Q-value spectra of the 16 O+ 208 Pb and 184 W systems at three energies below the barriers.…”

“…The systematic studies of the surface diffuseness parameters of nuclear potentials and the barrier distributions for the 16 208 Pb systems, will be presented in section 2. The details of experimental procedure are included in this section.…”

“…Moreover, from the experimental point of view, the detection method is simpler for the quasi-elastic particles at backward angles close to 180 than that for the fusion residual at forward angles close to beam direction. Therefore, the backward quasi-elastic measurements were employed in experiment to probe the surface diffuseness parameter [11][12][13][14][15], the barrier distribution [16][17][18][19][20], etc., in the past years.…”