We compile the results of analyses, based upon the potential barrier penetration model, of fusion cross-section measurements at "high" energies (those on the high-energy side of the bend in the ${\sigma }_{\mathrm{fus}}$ vs $\frac{1}{E_{\mathrm{c}.\mathrm{m}.\mathrm{}}}$ plot). A systematic correlation between the critical radius $R_{\mathrm{cr}}$ and the potential $V_{\mathrm{cr}}$ at that radius is demonstrated. These results provide information about the nucleus-nucleus potential at smaller distances than is usually available from scattering and "low" energy fusion measurements. For some systems, nuclear potential depths of as much as - 110 MeV are implied.

NUCLEAR REACTIONS Review of fusion cross sections for heavy-ion systems. Systematic effects extracted and discussed in terms of nucleus-nucleus potential.

• Received 18 April 1983

DOI:https://doi.org/10.1103/PhysRevC.28.952