Onset of Damping in Energetic Heavy-Ion Interactions

Abstract

Measurements of longitudinal momenta transferred to mass-identified products of the fragmentation of Cu by 12 C ions give clear evidence for a change in reaction mechanism between 22 and 84 MeV/u. Results at 84 MeV/u are generally consistent with peripheral interactions. However, at 22 MeV/u large momentum transfers observed for near-target products suggest that strongly damped processes have become important. Limits to momentum transfer of the type reported by Galin et a I. are shown to arise in a natural way from this transition.

Projectile mass dependence for the interaction of copper withN14,OWhitfield1, Porile2 1994Phys. Rev. C0000View full textAdd to dashboardCite

“…Similar results for trans-target products have been found for the interaction of copper with~~C at 15 and 22 MeV/nucleon [14,21] and 8 -28 MeV/nucleon 2oNe v~~, as described in previous publications &om our group [13 -16]. The product of this prefragment mass and v~ĩ s then P~~f or the given product.…”

Target Residues from the Interaction of Copper with 20-46 MeV/Nucleon 12C Ion

“…This quantity is most relevant to the central collisions. (2) The average value of the LMT for the entire distribution. This value reflects an average result integrated over all impact parameters from peripheral to central collisions.…”

“…A lot of radiochemical studies have been reported for interactions of natural copper targets with lighter heavy ions over a wide ränge of projectile energies [1][2][3][4][5][6]. In particular some systematic measurements have been carried out.…”