Origins of intermediate mass fragments for 40Ar + natAg reaction at 30 MeV/u

The energy spectra of intermediate-mass fragments (IMF) (3≤Z≤16) have been measured from 6° to 110° for 40Ar + natAg reaction at 30 MeV/u. The energy spectra were analyzed by the moving source model. The natures of the projectile-like source, target-like source and mid-rapidity source as well as the evolution with angle and nuclear charge were discussed. Two intermediate mass fragments, measured by correlation method in forward angles, come from two sources. One comes from projectile-like source, and other one mainly comes from intermediate source respectively.