HEAVY RESIDUES FROM VERY MASS-ASYMMETRIC HEAVY-ION REACTIONS

The isotopic production cross sections and momenta of all residues with nuclear charge greater than 39 from the reaction of 26, 40, and 50 MeV/nucleon Xe-129+Be, C, and Al were measured. The isotopic cross sections, the momentum distribution for each isotope, and the cross section as a function of nuclear charge and momentum are presented here. The new cross sections are consistent with previous measurements of the cross sections from similar reaction systems. The results are compared to a geometric incomplete fusion model and a Boltxmann-Nordheim-Vlasov model. Agreement between the models and the data is fair. The most proton-rich nuclei observed in this study are predicted to have less than 50 nb production cross sections by both of these models but are observed to have much larger cross sections.