Contemporary presence of dynamical and statistical production of intermediate mass fragments in midperipheral ${}^{58}$Ni+${}^{58}$Ni collisions at 30 MeV/nucleon

Abstract

The ${}^{58}Ni{+}^{58}Ni$ reaction at 30 MeV/nucleon has been experimentally investigated at the Superconducting Cyclotron of the INFN Laboratori Nazionali del Sud. In midperipheral collisions the production of massive fragments (4$\le$Z$\le$12), consistent with the statistical fragmentation of the projectile-like residue and the dynamical formation of a neck, joining projectile-like and target-like residues, has been observed. The fragments coming from these different processes differ both in charge distribution and isotopic composition. In particular it is shown that these mechanisms leading to fragment production act contemporarily inside the same event.

9 pages, minor corrections

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• Fragment Production in Non-central Collisions of Intermediate Energy Heavy Ions
• Fragment Isospin as a Probe of Heavy-Ion Collisions
• Energetics of midvelocity emissions in peripheral heavy ion collisions at Fermi energies
• Size and asymmetry of the reaction entrance channel: influence on the probability of neck production