Parity Dependence of the Heavy-Ion Optical Potential

Abstract

Recently measured gross structure in the 180\ifmmode^\circ\else\textdegree\fi{} excitation function of $^{28}\mathrm{Si}$ + $^{16}\mathrm{O}$ elastic scattering is fitted very well by including a small parity-dependent term in an energy-dependent and surface-transparent optical potential. This interpretation is in contrast to a previous proposal suggesting that the structure is due to potential shape resonances of varying principal quantum numbers $n$ and angular momenta $L$.