gibuu is hosted by Hepforge, IPPP Durham
GiBUU

TABLE OF CONTENTS


/collisionCriteria [ Modules ]

[ Top ] [ Modules ]

NAME

module collisionCriteria

PURPOSE

Includes routines to evaluate whether a 2-body collision among two particles is taking place.

NOTES

Available are two different collision criteria:


collisionCriteria/debug [ Global module-variables ]

[ Top ] [ collisionCriteria ] [ Global module-variables ]

SOURCE

  logical, save :: debug = .false.

PURPOSE

Set to .true., this logical will cause debug information.


collisionCriteria/kodama_evalFrame [ Global module-variables ]

[ Top ] [ collisionCriteria ] [ Global module-variables ]

SOURCE

  logical, save :: kodama_evalFrame = .false.

PURPOSE

Set to .true., this logical will cause the kodama criterion to be evaluated in the laboratory/evaluation frame, not CM frame.


collisionCriteria/readInput_coll [ Subroutines ]

[ Top ] [ collisionCriteria ] [ Subroutines ]

NAME

subroutine readInput_coll

PURPOSE

Reads input out of jobcard "collCriteria".

INPUTS

none

OUTPUT

Modifies global module variables.


collisionCriteria/collCriteria [ Namelists ]

[ Top ] [ collisionCriteria ] [ Namelists ]

NAME

NAMELIST collCriteria

PURPOSE

Includes the input switches:


collisionCriteria/localCollisionCriteria [ Functions ]

[ Top ] [ collisionCriteria ] [ Functions ]

NAME

logical function localCollisionCriteria(pair,sigmaTot,weightLocal,numEnsembles,deltaT)

INPUTS

  • type(particle),intent(in),dimension(1:2) :: pair -- Particles which should be checked for a possibility to collide
  • real, intent(in) :: delta_T -- Time step size
  • real, intent(in) :: sigmaTot -- total cross section in mb
  • integer, intent(in) :: weightLocal -- rescaling factor for probability: p=p*weightLocal
  • integer, intent(in) :: numEnsembles -- number of Ensembles

OUTPUT

  • The function is true if the criterion is fullfilled, and false if not!

NOTES

This is based upon the prescription of Lang et al., i.e. the "local collision criterion".


localCollisionCriteria/protocol_prob [ Functions ]

[ Top ] [ localCollisionCriteria ] [ Functions ]

NAME

subroutine protocol_prob

PURPOSE

This subroutine is called if "debug=.true.". It stores all calculated probabilities in a histogram. After 1000 savings, it is writing the current histogram to file "CollisionProb.dat".

OUTPUT

  • file "CollisionProb.dat"


collisionCriteria/kodama_position [ Functions ]

[ Top ] [ collisionCriteria ] [ Functions ]

NAME

logical function kodama_position(teilchen,bmax)

INPUTS

Particles which should be checked for a possibility to collide:

  • type(particle),intent(in),dimension(1:2) :: teilchen

Maximal impact parameter:

  • real, intent(in) :: bMax

NOTES

The particles' velocities and positions need to be properly defined! The notation is according to Effenberger's Dr. thesis page 251. This implements the criterion that the relative distance in space of two particles should be smaller than bMax in the CM-Frame of both particles.

OUTPUT

The function is true if the criterion is fullfilled, and false if not!


collisionCriteria/kodama_time [ Functions ]

[ Top ] [ collisionCriteria ] [ Functions ]

NAME

logical function kodama_time(teilchen,delta_T,collision_time)

INPUTS

Particles which should be checked for a possibility to collide:

  • type(particle),intent(in),dimension(1:2) :: teilchen

Time step size:

OUTPUT

  • Time instant in the computational frame when the two particles collide (with respect to the current "BUU time" used for time stepping): real, optional, intent(out) :: collision_time
  • The function is true if the criterion for tau_1 and tau_2 is fullfilled, and false if not!

NOTES

The notation is according to Effenberger's Dr. thesis pages 251-252. This function implements the criterion that the relative distance in time of two particles should fulfill Abs(tau_1+tau_2)<delta_T. This was first implemented by G.Wolf. The meanings of tau_1 and tau_2 are explained in Effenbergers thesis pages 251ff.