Equilibration and multifragmentation in heavy ion reactions

Conference · Wed Sep 01 04:00:00 EDT 1993

OSTI ID:10134883

Peilert, G; Mustafa, M G; Blann, M ^[1]; Botvina, A ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Russian Academy of Sciences, Moscow (Russian Federation). Inst. for Nuclear Research

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. In this work we consider the interactions of {sup 36}Ar with {sup 197}Au at incident energies of 35 to 110 MeV{center_dot}A, which was investigated by de Souza et al. We will first look at two dynamic models which may be used to estimate the excitation remaining for quasi-equilibrated systems following the fast nucleonic cascade, specifically the Boltzmann master equation (BME) and Quantum molecular dynamics (QMD) approaches. Using excitations from the BME model to estimate values for quasi-equilibrated nuclei, we will explore two approaches to statistical multifragmentation calculations, one of sequential binary decay, the other a simultaneous multifragmentation model (SMM). We will consider central collisions in our calculations, and experimental results gated on the highest total charged particle emissions -- those deduced to be central collisions.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10134883
• Report Number(s): UCRL-JC--115916; CONF-930999--8; ON: DE94008677
• Country of Publication: United States
• Language: English

Related Subjects

663450
663580
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
A = 190-219
ARGON 36 REACTIONS
GOLD 197 TARGET
HEAVY-ION-INDUCED REACTIONS AND SCATTERING
MULTIPLICITY
NUCLEAR FRAGMENTATION
NUCLEAR MODELS