ENERGY DEPENDENCE OF FUSION AND REACTION CROSS SECTIONS IN THE 9Be+12C SYSTEM

Angular distributions of protons, deuterons, tritons and a-particles were measured for the system 9Be+"C at lab energies between 12 and 27 MeV. The compound nucleus model with level densities calculated according to the Gilbert-Cameron formula describes satisfactorily the measured proton, deuteron and triton data. In the a-particle spectra contributions from other processes seem to be present . In the analysis the fusion cut-off angular momentum was adjusted at each energy in order to reproduce correctly the proton, deuteron and triton channels . From this analysis the fusion cross section was determined as a function of the energy . The results were compared with fusion and total reaction cross section values calculated from a potential model with the real part of the interaction potential obtained from the double folding procedure of Satchler . NUCLEAR REACTIONS 'ZC(9Be, p), 12C( 9 13e, d), "C(9Be, t), 'ZC( 9Be, a), E = 12, 14, 17, 20, 23 .5, 27 MeV; measured a(E, 0) ; Hauser-Feshbach model analysis ; deduced a(reaction), a(fusion) and /(cut-off) from the interaction potential.