Transfer reactions and sequential decays of the projectile-like fragments in the 60 MeV/nucleon 40Ar + natAg, 197Au Reactions

Projectile break-up with two outgoing intermediate-mass fragments in 26 AMeV32S+197Au

“…Correlated pairs of projectile fragments with intermediate mass have already been observed by Murphy et al [13] in 20 AMeV 35C1+ lSlTa and by Steckmeyer et al [ 14] in 60 AMeV 4~ + Ag, Au. Both investigations concluded that the IMF-IMF pairs result from the sequential decay of an excited primary projectile-like fragment.…”

“…The friction acting to a different degree on the projectile fragments, depending on their proximity to the target, implies different decelerations and thus naturally leads to large relative energies.) In their experiment with 60AMeVAr projectiles, Steckmeyer et al [14] were able to reconstruct the primary-PLF excitation energies eventwise from all registered fragments and particles. Transferring their results and scaling the mean excitation energies down according to the lower bombarding energy of the present experiment we would estimate 25 MeV average excitation for the primary PLFs around Mg, with a tendency of decrease for heavier PLFs.…”

“…2) quite well. Actually, the previous studies of projectile decay into IMF-IMF pairs [13,14] took the relative-velocity distributions and the emission angular distribution as criteria and concluded on the sequential character of the emission. As we tried to indicate, however, these criteria are ambiguous.…”

“…This is given by the inclusive carbon cross section at 14.3 ~ multiplied with the probability Pc, to find a second carbon emitted somewhere into the full solid angle, d~ /dg2c-c, (14…”

Preequilibrium versus thermalized light-charged particle emissions in the40Ar (1100MeV)+24Mg reaction. Dynamical calculations

“…If this latter type of emission has been abundantly documented [1], numerous questions remain open about the former in spite of a great deal of work. Indeed, extensive studies of LP and particularly neutrons of PE origin have been performed in coincidence with evaporation residues [2], fission fragments [3], projectile-like fragments [4] and intermediate mass fragments [5]. The references mentioned here are just examples of many articles found in the literature.…”