Abstract
When a projectile with several hundred MeV of kinetic energy per nucleon interacts with a target nucleus, a very large number of final states are available in the interaction. A significant fraction of the reaction products will be ejectiles of more than a few nucleons. Certainly, nucleon emission dominates, but the yields of higher mass fragments are also substantial. Further, a large portion of the integrated cross section comes from emission of particles with more than a few MeV of kinetic energy per nucleon; that is, with energies beyond those associated with emission from a large system of nucleons in thermal and chemical equilibrium. For example, shown in Fig. 1 is a recent analysis of proton-induced fragment emission from a silver target at 480 MeV (GKJ 83). Shown is the percentage of the reaction products that these authors estimate arises from nonevaporative processes (that is, an evaporation model fit is made to the evaporative part of the light-ion differential cross section, with the resulting prediction for heavy fragments then compared with the data). Such processes will be called preequilibrium here. Because energetic-fragment production is such a common reaction channel for both proton- and heavy-ion-induced reactions, it has become a currently popular area of study from both experimental and theoretical viewpoints.KeywordsNuclear ReactionDifferential Cross SectionSource SizeInclusive Cross SectionHeavy TargetThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Published Version
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