Isotopically resolved intermediate-mass fragment and light charged particle production from the reactions {sup 40}Ar and {sup 40}Ca with {sup 58}Fe and {sup 58}Ni at E{sub beam}=33 and 45 MeV/nucleon

Isotopically resolved intermediate-mass fragments and light charged particles have been detected from the reactions {sup 40}Ar and {sup 40}Ca with {sup 58}Fe and {sup 58}Ni at E{sub beam}=33 and 45 MeV/nucleon. There is an angular dependence to the isotopic ratios. A moving source analysis shows that fragments emitted at {Theta}{sub lab}=40{degree} can be attributed primarily to a composite source while the fragments emitted at backward angles are primarily from a targetlike source. The results are compared to predictions of QMD, BUU, and GEMINI. QMD generally reproduces the charge distribution and energy spectra and has partial success with the isobaric ratios when the system is chemically equilibrated. All of the models have difficulty reproducing the isotopic ratios when the system is not chemically equilibrated. {copyright} {ital 1997} {ital The American Physical Society}