Abstract
Angular distributions at angles 130 less than theta/sub cm/ less than 180/sup 0/ were measured for /sup 12/C + /sup 28/Si, /sup 32/S, /sup 40/Ca as well as /sup 9/Be, /sup 13/C + /sup 28/Si in the energy range 20 MeV less than or equal to E/sub cm/ less than or equal to 35 MeV. Cross sections rising towards 180/sup 0/ are observed for all reactions. Excitation functions for the back-angle enhancement show distinct structures, most pronounced for /sup 12/C + /sup 28/Si. Angular distributions for /sup 12/C, especially those corresponding to peaks in the excitation function show oscillations of the type vertical bar P/sub J/(cos theta) vertical bar/sup 2/. The /sup 12/C back-angle enhancement decreases with target mass. Backscattering of the nonalpha nuclei /sup 9/Be and /sup 13/C is reduced by about two orders of magnitude in comparison with /sup 12/C. Similar measurements for the /sup 28/Si(/sup 12/C, /sup 16/O)/sup 24/Mg reaction and /sup 16/O + /sup 24/Mg elastic scattering allow comparison of reaction data with the corresponding entrance and exit channel data. Standard theoretical approaches fail to explain all the observed effects.
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