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\ARRAY MIXTURE_LIST

!----------------------------------------------------------------------

! MIXTURE DEFINITIONS . CALL TO GSMIXT

! FORMAT IS AS FOLLOWS.

! MIXTURE NAME (CAN BE UP TO 32 CHARS), MIXTURE NUMBER (OBSERVE CONVENTION HERE)

! NUMBER OF MATERIALS IN MIXTURE (NLMAT),

! NLMAT MATERIAL NUMBERS,

! WMAT(NLMAT) WEIGHTS.

! IF NLMAT>0, WMAT CONTAINS Weights OF MATERIALS IN PROPORTION.

! Density is the last word.

! IF NLMAT<0, WMAT CONTAINS PROPORTION BY  ATOMS OF MATERIALS IN MIXTURE

! followed by density of mixture.

!----------------------------------------------------------------------

'Argon (atm.)'   19  1  18  1.000 0.162E-02

'TPC P10 gas'    22  3  18 6  1  0.957  0.032  0.011 0.167E-02

'Scintillator'   23 -2  6  1   1.00   1.10 0.103E+01

'Al honeycomb'   20  1  9  1.000 0.616E+00

'Mylar'          27 -3  6  1  17  5.00   4.00   2.00 0.139E+01

'Neon_Alum'      33  1  8  1.000 0.270E+01

'Beamline air'   34  1 15  1.000 0.100E-05

'Rohacell'       39 -4  6  1 17  7   8.00  10.00   1.00   1.00 0.500E-01

'NEMA G10'       40  7 17  6 24 38  9 25  1 0.364 0.293 0.154 0.086 0.056 0.024 0.023 0.170E+01

'Pyrex'          41  4 24 25 26 17  0.385  0.039  0.038  0.538 0.223E+01

'Polyethylene'   42 -2  6  1   1.00   2.00 0.935E+00

'FC Al window'   43  1  9  1.000 0.270E+00

'Lucite'         44 -3  6  1 17   5.00   8.00   2.00 0.118E+01

'Freon114'       47 -3  6 45 46   5.00   2.00   4.00 0.763E-02

'Ckovpanel'      48 -4  6  1 17 21   8.54   2.50   0.50   0.50 0.580E-01

'Tedlar'         49 -3  6  1 46   2.00   3.00   1.00 0.155E+01

'Vinyl'          50 -3  6  1 45   2.00   3.00   1.00 0.141E+01

'Glass'          51 -2 24 17   1.00   2.00 0.232E+01

'Fwindow'        52 -6  9  6  1 46 17 21  10.50  24.60  25.90   2.30   2.00   2.00 0.118E+01

\END

Example is from mothers.rcp. The mixture TPC P10 gas is defined with mixture number 22. It has number of materials (NLMAT) = 3. These three material numbers are 18, 6 and 1 which are predefined materials Argon, Carbon and Hydrogen. The proportions of these materials are 0.957, 0.032 and 0.011 by weight. These must add to unity. The density of the gas is 0.167E-2 gm/cc. If NLMAT is specified to be -3, then one would give the molecular proportions as in the case of mixture 27, Mylar, which had Carbon, Hydrogen and Oxygen as C5H4O2. This then is followed by the overall density of the mixture, in this case 1.39 gm/cc. For a description of the Geant subroutine GSMIXT, please follow the hyperlink GSMIXT.