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Manuscript Title: Interactions between hadrons and nuclei: the Lund Monte Carlo - FRITIOF version 1.6.
Authors: B. Nilsson-Almqvist, E. Stenlund
Program title: FRITIOF VERSION 1.6
Catalogue identifier: AATH_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 43(1987)387
Programming language: Fortran.
Computer: ND-570.
Operating system: SINTRAN III - VSX/500.
RAM: 61K words
Word size: 32
Keywords: Elementary, Particle physics, High-energy collisions, Hadron-hadron, Hadron-nucleus, Nucleus-nucleus, Interactions, Monte carlo simulation, Event simulation.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
AAFP_v1_0 JETSET 6.2 CPC 39(1986)347

Other versions:
Cat Id Title Reference
ACHY_v1_0 FRITIOF VERSION 7.0 CPC 71(1992)173

Nature of problem:
In high energy hadron-hadron and hadron-nucleus collisions particle production at low transverse momentum is the dominating feature and most of the produced particles are moving in a narrow cone along the beam direction. This is not explained by quantum chromodynamics, the candidate theory of strong interactions, and is believed to be closely related to quark confinement. Nevertheless, QCD inspired phenomenological formulations have been used to explain interactions with small transverse momentum transfers. Questions concerning the differences between low and high p transverse interactions, the mechanisms responsible for the momentum trafer and the hadronization processes, are still unanswered.

Solution method:
When two hadrons collide, momenta are exchanged and two longitudinally excited objects are created. In hadron nucleus or nucleus nucleus interactions each hadron can make several encounters. In each of the repeated binary encounters, the objects can get further excited, thereby increasing their masses during the passage through the nucleus. Finally, all the excited objects hadronize independently, like massless relativistic strings, according to the Lund model for jet fragmentation. The hadronization takes place outside the nuclei and thus no intranuclear cascading is considered.

Restrictions:
The model is limited to low p(transverse) processes and neither production of prompt photons for Drell Yan production are considered. Spectator nucleons, i.e. parts of the nuclei not actively participating in the interaction, are not treated in the model. The produced particles are not allowed to cascade.

Running time:
The running time strongly depends on the incident particles.