Fusion measurements in light and medium mass heavy-ion reactions. Progress report, June 1, 1979-May 31, 1980

Data were obtained on the γ-ray yield from the fusion reactions of 1618O + 2426Mg in the 25 to 70 MeV energy range. Analysis of these data in terms of the relative yields of specific residues as a function of bombarding energy is almost complete for 16O + 26Mg. Of particular interest will be a comparison of these results with those for 18O + 24Mg. The investigation of the fusion cross sections of 16O + 2426Mg was extended from 70 MeV to 140 MeV. An unexpected decrease in the fusion cross sections begins at about 100 MeV and persists to the highest energy obtained. This investigation will be continued to 170 MeV and expanded to include 18O + 24Mg. Data were obtained on the interaction of 16O + 40Ca at 128 MeV to determine the reaction mechanisms, other than fusion, present at higher energy. Plans for continuation of these experiments and for new experiments are discussed. A major effort has been the development of new programing to take advantage of a new color graphics interactive terminal for data analysis. No data of significance are included with this report; completed work will be published. 2 figures