Large fragment production calculations in relativistic heavy-ion reactions. [Abrasion-ablation model, cross sections, fireball and firestreak models]
The abrasion-ablation model is briefly described and then used to calculate cross sections for production of large fragments resulting from target or projectile fragmentation in high-energy heavy-ion collisions. The number of nucleons removed from the colliding nuclei in the abrasion stage and the excitation energy of the remaining fragments (primary products) are calculated with the geometrical picture of two different models: the fireball and the firestreak models. The charge-to-mass dispersion of the primary products is calculated using either a model which assumes no correlations between proton and neutron positions inside the nucleus (hypergeometric distribution) or a model based upon the zero-point oscillations of the giant dipole resonance (NUC-GDR). Standard Weisskopf--Ewing statistical evaporation calculations are used to calculate final product distributions. Results of the pure abrasion-ablation model are compared with a variety of experimental data. The comparisons show the insufficiency of the extra-surface energy term used in the abrasion calculations. A frictional spectator interaction (FSI) is introduced which increases the average excitation energy of the primary products, and improves the results considerably in most cases. Agreements and discrepancies of the results calculated with the different theoretical assumptions and the experimental data are studied. Of particular relevance is the possibility of observing nuclear ground-state correlations.Results of the recently completed experiment of fragmentation of 213 Mev/A /sup 40/Ar projectiles are studied and shown not to be capable of answering that question unambiguously. But predictions for the upcoming /sup 48/Ca fragmentation experiment clearly show the possibility of observing correlation effects. 78 references.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6313776
- Report Number(s):
- LBL-8561
- Country of Publication:
- United States
- Language:
- English
Similar Records
Optical model calculations of heavy-ion target fragmentation
Theoretical calculations of peripheral reaction yields from relativistic heavy ions. [Fireball and firestreak models]
Related Subjects
Baryon No. Greater than 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHARGED-PARTICLE REACTIONS
COHERENT TUBE MODEL
CORRELATIONS
CROSS SECTIONS
DATA
DATA FORMS
DISTRIBUTION
ELECTRIC CHARGES
ELEMENTARY PARTICLES
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
GEOMETRY
GIANT RESONANCE
GROUND STATES
HADRONS
HEAVY ION REACTIONS
INFORMATION
ISOLATED VALUES
MASS
MATHEMATICAL MODELS
MATHEMATICS
NEUTRONS
NUCLEAR FIREBALL MODEL
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
OSCILLATIONS
PARTICLE MODELS
PROTONS
RELATIVISTIC RANGE
RESONANCE
SURFACES
THEORETICAL DATA
YIELDS