Composite particles and entropy production in relativistic nuclear collisions

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.32.116· OSTI ID:5348668

Doss, K G.R.; Gustafsson, H; Gutbrod, H H; Kolb, B; Loehner, H; Ludewigt, B; Poskanzer, A M; Renner, T; Riedesel, H; Ritter, H G

The particle production (p,d,t,/sup 3/He,/sup 4/He) was studied for 400 and 650 MeV/nucleon Nb+Nb and 400 and 1050 MeV/nucleon Ca+Ca. The chemical freeze-out density of the participants and the entropy produced were deduced for each system. The chemical freeze-out densities are close to normal nuclear density. The entropy production extrapolated for infinite nuclear matter is independent of target-projectile combination at 400 MeV/nucleon and changes little with increasing bombarding energy, but the absolute values are strongly model dependent. The low entropy, when compared to fireball calculations, indicates that compression is present in the collisions. Therefore entropy values in principle can help in the determination of the equation of state for nuclear matter.

• Research Organization: Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 Gesellschaft fuer Schwerionenforschung, D-6100 Darmstadt, Federal Republic of Germany
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5348668
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 32:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH METALS
BARYONS
CALCIUM
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COMPOSITE MODELS
DEUTERONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENTROPY
EQUATIONS
EQUATIONS OF STATE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRONS
HEAVY ION REACTIONS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MATTER
METALS
MULTIPLICITY
NIOBIUM
NUCLEAR MATTER
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHYSICAL PROPERTIES
PROTONS
RELATIVISTIC RANGE
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRITONS