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Manuscript Title: FREESCO: statistical event generator for nuclear collisions.
Authors: G. Fai, J. Randrup
Program title: FREESCO
Catalogue identifier: AALV_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 42(1986)385
Programming language: Fortran.
Computer: CDC-6600, CDC-7600.
RAM: 72K words
Word size: 32
Peripherals: disc.
Keywords: Nuclear physics, Multifragment events, Minimal dynamics, Collision, Microcanonical Explosion-evaporation Statistically generated Description, Disassembly, Heavy ion.
Classification: 17.7.

Nature of problem:
In nucleus-nucleus collisions above a few tens of MeV/N, a large number of multifragment channels are open and modern detector systems can detect nearly all the charged fragments produced. Therefore, large samples of complete events must be calculated. A well-defined, least biased reference model results from assuming that the disassembly occurs statistically.

Solution method:
The collision produces a (small) number of sources which disassemble statistically. Highly excited sources explode quickly into a number of elementary and complex fragments; this process is simulated by random sampling of an approximate representation of the appropriate microcanonical phase space distribution. Less excited sources and metastable explosion products decay more slowly by sequential evaporation of light nuclei.

Restrictions:
The code is intended for beam energies in the range from a few tens of MeV/N to a few GeV/N.

Running time:
Average CPU time for 400 MeV/N **93Nb+ **93Nb is 1.75 seconds per event on a VAX 8600.