Surface Resonances in Backward-Angle Heavy-Ion Scattering

摘要: Backward-angle excitation functions (${\ensuremath{\theta}}_{\mathrm{c}.\mathrm{m}.}=180\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}5\ifmmode^\circ\else\textdegree\fi{}$) have been measured for the systems $^{16}\mathrm{O}$ + $^{28}\mathrm{Si}$ and $^{12}\mathrm{C}$ elastic inelastic scattering to first excited state in $^{28}\mathrm{Si}$. Over investigated energy range, $17\ensuremath{\lesssim}{E}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\lesssim}37$ MeV, data exhibit gross structure resonances of widths between 1 2 MeV modulated by a finer ($\ensuremath{\Delta}{E}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\lesssim}250$ keV). Shape with different principal quantum numbers are suggested as an explanation resonances.