EVAPORATION RESIDUE, FISSION CROSS-SECTIONS, AND LINEAR MOMENTUM-TRANSFER FOR N-14 INDUCED REACTIONS FROM 35A TO 155A MEV

Differential cross sections for evaporation residues and fission fragm ents for 35A, 100A, 130A and 155A MeV N-14 on targets ranging from Sm- 154 to (197)AU have been measured. The angle-integrated cross sections are larger than what might be expected. The fission fragment-fission fragment folding angle correlations for 35A, 100A MeV N-14 and 25A MeV O-16 on similar targets were also measured. The average linear moment um transfer has been deduced from both the fission angle correlation a nd from the fore-aft asymmetry of the fission angular distributions in the laboratory system. The data are all consistent with a picture whe re pre-equilibrium particle emission removes an increasing fraction of the orbital angular momentum as the bombarding energy increases. This allows a large range of partial waves to contribute to formation of a composite nucleus with a finite fission barrier.