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

Abstract

Abstract. The excitation functions of quasi-elastic scatterings at backward angles were measured with high precision to study the mechanisms of heavy-ion reactions at near-and sub-barrier energies. The surface diffuseness parameters for the 16 O+ 144,152,154 Sm, 170 Er, 174 Yb, 184,186 W, 194,196 Pt, and 208 Pb systems have been extracted by the single-channel and coupled-channels calculations, respectively. No anomaly was found in these quasi-elastic processes. The barrier heights and barrier distributions were systematically investigated for these systems. Moreover, the coupled-channels effects of neutron transfers with positive Q-value and the breakup effects of weakly-bound nuclei on the fusion processes were also studied for the 32 S+ 90,96 Zr systems and the 6,7 Li, 9 Be+ 208 Pb systems, respectively.

Extracting the hexadecapole deformation from backward quasi-elastic scattering

“…A Woods-Saxon potential with the geometrical parameters of r 0V = 1.20 fm and a V = 0.65 fm was used. The depth V was varied to reproduce the barrier energy determined from the QEL scattering excitation function at dσ QEL /dσ Ru = 0.5 [33], which is very close to the value extracted from fusion data. As usual, a short-range imaginary potential with W = 30 MeV, r 0W = 1.0 fm, and a W = 0.4 fm was used to simulate the compound nucleus formation [34].…”

Smoothing of structure in the fusion and quasielastic barrier distributions for the20Ne+Piasecki1, Świderski2, Keeley3 et al. 2012Phys. Rev. C250180View full textAdd to dashboardCite

“…[30], this method has been widely used; see Refs. [1,[35][36][37][38][39][40][41][42][43][44][45][46][47][48]. When the barrier distributions are structureless, the two approaches (i.e., fusion and quasielastic scattering) usually give similar results [30,35,40,[49][50][51].…”