ISOTOPICALLY RESOLVED INTERMEDIATE-MASS FRAGMENT AND LIGHT CHARGED-PARTICLE PRODUCTION FROM THE REACTIONS AR-40 AND CA-40 WITH FE-58 AND NI-58 AT E-BEAM=33 AND 45 MEV NUCLEON/

Isotopically resolved intermediate-mass fragments and light charged pa rticles have been detected from the reactions Ar-40 and Ca-40 with Fe- 58 and Ni-58 at E-beam=33 and 45 MeV/nucleon. There is an angular depe ndence to the isotopic ratios. A moving source analysis shows that fra gments emitted at Theta(lab)=40 degrees 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 predi ctions of QMD, BUU, and GEMINI. QMD generally reproduces the charge di stribution and energy spectra and has partial success with the isobari c ratios when the system is chemically equilibrated. All of the models have difficulty reproducing the isotopic ratios when the system is no t chemically equilibrated.