Abstract: AVERAGE LINEAR MOMENTUM TRANSFER FROM THE INTERACTION OF COPPER WITH IONSWU DINGOING；Ll WENXIN；SUN TONGYU；SUNRULIN；ZHAO LILI；YIN XINMIN；JING GENMING（Institute of modern Physics,Chinese Academy of Sciences,Lanzhou 730000）LIZE；JING KEXING；LIXINHUA（China Institute of Atomic Energy，Beijing 102413）ABSTRACT In the reaction of 20-46MeV／u with Cu，the mean forward recoil ranges of some 41residual nuclei are measured with thick target-thick catcher foil techniques in conjunction withoff-line r-ray spectroscopy． These data are used to obtain the average linear momentum transferintegrated over all impact parameters. The average linear momentum transfer is found to attain amaximum value of 155MeV／c at 27．5 MeV／u. The mean excitation energies at higherbombording energies reached about 103MeV，corresponding to a nuclear temperature of3．5MeV. The experimental results are compared with reference valus.Key words Off－line r-ray spectroscopy Residual nuclei excitation energies Linear momentum transfer