MEASUREMENTS OF THE TOTAL REACTION CROSSSECTION USING THE SUM-OF-DIFFERENCES METHOD

A precise measurement of the total reaction cross sections in a model independent way was made using the sum-of-differences (SOD) method in C-12, C-13, N-15, O-16 + Si-28 elastic scattering at incident energies much higher than the Coulomb barrier. Cross Sections have been measur ed in an angular range of theta(lab) = 0.6 degrees similar to 2.0 degr ees with high accuracy. The scattering amplitudes at theta = 0 degrees and the total reaction cross sections were deduced from the present o bservation by the SOD method. These total reaction cross sections were compared with the results obtained from optical model analyses. Furth ermore, it was shown that the contribution of the complete-fusion proc ess to the total-reaction cross section in the C-12 + Si-28 scattering system was 75% at E-cm = 45.5 MeV. (C) 1998 Elsevier Science B.V.