G. Peilert

Energy dependence of multifragmentation in 84Kr+197Au collisions.

The relationship between observed intermediate mass fragment and total charged particle multiplicities has been measured for [sup 84]Kr + [sup 197]Au collisions at energies between [ital E]/[ital A]=35 and 400 MeV. Fragment multiplicities are greatest for central or near-central collisions. For these collisions, fragment production increases up to [ital E]/[ital A][approx]100 MeV, and then decreases at higher energies.

Energy dependence of multifragmentation in [sup 84]Kr+[sup 197]Au collisions

The relationship between observed intermediate mass fragment and total charged particle multiplicities has been measured for [sup 84]Kr + [sup 197]Au collisions at energies between [ital E]/[ital A]=35 and 400 MeV. Fragment multiplicities are greatest for central or near-central collisions. For these collisions, fragment production increases up to [ital E]/[ital A][approx]100 MeV, and then decreases at higher energies.

Energy Dependence of Multifragmentation in 84Kr+197Au Reactions

The relationship between observed intermediate mass fragment and total charged particle multiplicities has been measured for [sup 84]Kr + [sup 197]Au collisions at energies between [ital E]/[ital A]=35 and 400 MeV. Fragment multiplicities are greatest for central or near-central collisions. For these collisions, fragment production increases up to [ital E]/[ital A][approx]100 MeV, and then decreases at higher energies.

Equilibration and Multifragmentation in Heavy Ion Reactions

Modeling of multifragmentation measurements from heavy ion reactions generally requires separate treatment of the initial fast part of the reaction, during which energetic nucleons are emitted, and of a quasi-equilibrated system where sufficient degrees of freedom have been excited, so that statistical approaches may be applied. Some of the more sophisticated fast cascade models, e.g., Quantum molecular dynamics (QMD), might also produce fragment yields, however, transport models have not yet been able to satisfactorily reproduce fragmentation properties of nuclear reactions.

Fragment-Fragment Correlations

A topic of great interest in nuclear physics is the multifragmentation of heavy nuclei at moderate excitation energies. In the experiments from the Purdue group1, 2 first attempts have been made to relate the results in these reactions to the critical exponents of a phase transition, analogous to the liquid gas transition in condensed matter physics. Within the last years it became possible to study such reactions in highly exclusive experiments and to vary the order parameter of the proposed phase transition in order to extract the critical properties. This can be achieved by investigating the moments of the mass distributions as it was proposed by Campi3. Investigations utilizing the percolation model4 show indeed that this infinite matter phase transition is observable even in small finite systems of the size of nuclei5.