Production of light nuclei from Ar-36 and Ar-40 fragmentation at about 60 MeV/nucleon

fragments produced in the reactions of 69 MeV/nucleon Ar-36 and 55 MeV/nucl eon Ar-40 on a Be target have been measured experimentally. The isotopic di stributions from fragmentation reaction for both projectiles are reproduced by using a modified statistical abrasion-ablation model. the isotopic dist ributions produced in Ar-36 and Ar-40 fragmentation. disappearance of the i sospin effect in the fragmentation reaction. A strong isospin effect is exh ibited in Experimental evidence is seen for the disappearance of the isospi n effect in the fragmentation reaction.