SDI: Statistical dynamic interactions

Conference · Mon Apr 01 04:00:00 EST 1991

OSTI ID:5833090

Blann, M; Mustafa, M G ^[1]; Peilert, G; Stoecker, H; Greiner, W ^[2]

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1. Lawrence Livermore National Lab., CA (USA)
2. Frankfurt Univ. (Germany, F.R.). Inst. fuer Theoretische Physik

We focus on the combined statistical and dynamical aspects of heavy ion induced reactions. The overall picture is illustrated by considering the reaction {sup 36}Ar + {sup 238}U at a projectile energy of 35 MeV/nucleon. We illustrate the time dependent bound excitation energy due to the fusion/relaxation dynamics as calculated with the Boltzmann master equation. An estimate of the mass, charge and excitation of an equilibrated nucleus surviving the fast (dynamic) fusion-relaxation process is used as input into an evaporation calculation which includes 20 heavy fragment exit channels. The distribution of excitations between residue and clusters is explicitly calculated, as is the further deexcitation of clusters to bound nuclei. These results are compared with the exclusive cluster multiplicity measurements of Kim et al., and are found to give excellent agreement. We consider also an equilibrated residue system at 25% lower initial excitation, which gives an unsatisfactory exclusive multiplicity distribution. This illustrates that exclusive fragment multiplicity may provide a thermometer for system excitation. This analysis of data involves successive binary decay with no compressional effects nor phase transitions. Several examples of primary versus final (stable) cluster decay probabilities for an A = 100 nucleus at excitations of 100 to 800 MeV are presented. From these results a large change in multifragmentation patterns may be understood as a simple phase space consequence, invoking neither phase transitions, nor equation of state information. These results are used to illustrate physical quantities which are ambiguous to deduce from experimental fragment measurements. 14 refs., 4 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5833090
• Report Number(s): UCRL-JC-106927; CONF-9105144--2; ON: DE91012034
• Country of Publication: United States
• Language: English

Related Subjects

651520 -- Nuclear Properties & Reactions
A=39-58
Experimental
652020 -- Nuclear Properties & Reactions
A=220 & above
Experimental
653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
A CODES
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ARGON 36
ARGON 36 REACTIONS
ARGON ISOTOPES
BOLTZMANN EQUATION
CALCIUM 48 REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COMPUTER CALCULATIONS
COMPUTER CODES
DIFFERENTIAL EQUATIONS
DYNAMICS
EMISSION
ENERGY RANGE
EQUATIONS
EVEN-EVEN NUCLEI
FRAGMENTATION
HEAVY ION REACTIONS
HEAVY IONS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
IONS
ISOTOPES
KINETICS
LIGHT NUCLEI
MATHEMATICS
MECHANICS
MEV RANGE
MEV RANGE 10-100
NEUTRON EMISSION
NUCLEAR FRAGMENTS
NUCLEAR REACTION KINETICS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
PARTIAL DIFFERENTIAL EQUATIONS
RADIOISOTOPES
REACTION KINETICS
RUTHENIUM 100
RUTHENIUM ISOTOPES
STABLE ISOTOPES
STATISTICS
URANIUM 238
URANIUM 238 REACTIONS
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
YIELDS