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CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide CONS199<br />

Origin : R.Brun Submitted: 01.06.83<br />

Revision : Revised: 23.03.94<br />

Documentation : R.Brun, M.Maire<br />

The Material data structure JMATE<br />

NMATE IMATE JMATE<br />

1<br />

2<br />

.<br />

.<br />

5<br />

Material<br />

Name<br />

....<br />

6<br />

7<br />

8<br />

9<br />

10<br />

11<br />

A (AEFF for mixtures)<br />

Z (ZEFF for mixtures)<br />

Density<br />

RADL<br />

ABSL<br />

NLMAT<br />

User words<br />

Figure 6: JMA = LQ(JMATE-IMATE) pointer to material IMATE<br />

When the subroutine GPHYSI is called at initialisation time the following substructure is created for each<br />

material whose number is refered to by any of the user defined tracking media.<br />

Note: The energy losses are stored in GeV cm −1 . The inverse of the macroscopic cross-section (i.e. the<br />

mean free path, in cm), is stored instead of the cross-section, to speed up the calculation of the distance to<br />

the next interaction point.<br />

53 CONS199 – 1

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