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Manuscript Title: A program for the generation of artificial bubble chamber events.
Authors: J. Bettels, P. Dodd
Program title: GAT
Catalogue identifier: AAUC_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 3(1972)136
Programming language: Fortran.
Computer: CDC 6000.
Operating system: CDC6600.
RAM: 19K words
Word size: 60
Peripherals: magnetic tape.
Keywords: Elementary, High energy, Particle physics, Bubble chambers, Artificial events, Event simulation.
Classification: 11.2.

Nature of problem:
To simulate the output of bubble chamber measurements, with particular reference to the new large bubble chambers.

Solution method:
From a set of starting parameters a track is propagated by solving the equations of motions using a Runge-Kutta technique, allowing for energy- loss, radiation-loss and mulitple scattering. For each event a beam particle with given starting parameters and interaction length, is traced until it interacts. A choice is made among a set of permitted interaction channels, and the initial parameters of the appropriate secondary tracks are calculated, assuming Fermi phase-space statistics. These secondary tracks are then propagated until they leave the chamber volume, stop or interact. All calculated track points are then transformed onto a nominal film plane. Some of these transformed points are then selected as "mesurements" according to various criteria specified by the user. The usual method is to select points equidistant along the transformed track.

Restrictions:
The present program has a maximum of 10 tracks and 20 vertices per event. Neutral particles from secondary interactions are not treated. Both these restrictions can be removed by minor alterations to the coding.