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Manuscript Title: Program for spectra and cross-section calculations within the pre- equilibrium model of nuclear reactions.
Authors: E. Betak
Program title: PREEQ
Catalogue identifier: ABGO_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 9(1975)92
Programming language: Fortran.
Computer: CDC 3300.
Operating system: MASTER 3.
RAM: 20K words
Word size: 24
Keywords: Nuclear physics, Iteration, Reactions, Exciton model, Complex particles, Master-equation approach, Energy spectra, Preequilibrium decay.
Classification: 17.12.

Revision history:
Type Tit le Reference
correction 000ACORRECTION 16/5/75 See below

Nature of problem:
The program calculates particle spectra and/or cross-sections within the pre-equilibrium model of nuclear reactions using the master- equation approach to the model. The complex particles and the competition among various channels are also included in the calculation.

Solution method:
In the first part of the program, the emission rates for all outgoing channels and the transition rates are calculated. They enter the set of master equations describing the equilibration process and the decay. This set is solved by an iteration and after reaching the equilibrium its solution is extrapolated in time to infinity. Finally, the desired particle spectra and/or cross-sections are calculated.

Restrictions:
The complex particle emission may be calculated, but the sucessive particle emission is not included in the program. The maximum energy of the outgoing particles is restricted to 100 MeV. The composite nucleus can be created only by particles with mass numbers not exceeding 4. The program supposes that 4 aplhanumeric characters can be stored in one integer variable place. If not, minor modifications are required in the program. The commands, which may require to be changed, are flagged by a comment.

Running time:
The running time depends on the composite nucleus energy and the number of open (or desired) reaction channels. For the excitation energy of 50 MeV and the maximum, i.e. 6 outgoing particles, the running time is about 1 min for the CDC 3300 computer. For repeated calculations with slightly changed parameters part of the previous results is used, if possible, so that the necessary time is reduced.

CORRECTION SUMMARY
Manuscript Title: Program for spectra and cross-section calculations within the pre- equilibrium model of nuclear reactions. (C.P.C. 9(1975)92).
Authors: E. Betak
Program title: 000ACORRECTION 16/5/75
Catalogue identifier: ABGO_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 10(1975)71
Classification: 17.12.