Introduction

There are two packages to describe the hadronic showers in matter which are available to the users of GEANT: GHEISHA [] and FLUKA (see [PHYS520]).

The GHEISHA code generates hadronic interactions with the nuclei of the current tracking medium, evaluating cross-sections and sampling the final state multiplicity and kinematics, while the GEANT philosophy is preserved for the tracking. The GHEISHA code is stored in the GEANH car file.

The GHEISHA printing flags can be set via the GEANT SWIT data record: each switch greater than 100 but smaller that 111 sets the corresponding printing flag of GHEISHA modulo 100, so that SWIT 105 will set the printing flag 5 of GHEISHA. Setting the printing flags of GHEISHA the following information will be displayed:

NPRT(1)

one header for each track in the shower;

NPRT(2)

all tracking information;

NPRT(3)

kinematic of decays (not effective);

NPRT(4)

kinematic of nuclear interactions;

NPRT(5)

kinematic of electromagnetic interactions (not effective);

NPRT(6)

material constants, dE/dX and absorbed energies (not effective);

NPRT(7)

event summary;

NPRT(8)

history of all interactions/decays;

NPRT(9)

free;

NPRT(10)

tables of the geometry, cross-sections, etc.;

• Description of the routines