2.3.9} Production thresholds

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 The implicit NEW-DEFA default setting adopted in the example, sets, among
 other things, the production and transport threshold of heavy particles to 10
 MeV.  Production thresholds for e+e- and photons must be explicitly set using
 the EMFCUT command for all materials in the problem.  Let us choose also in
 this case a 10 MeV threshold for the single material of the example
 (previously marked with material index 5 and name BERYLLIU). Following the
 instructions about the EMFCUT option, the card can be written as:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
 * e+e- and gamma production threshold set at 10 MeV
 EMFCUT        -0.010     0.010       1.0       5.0                    PROD-CUT
 where the first numerical field is the threshold for e+e- (the minus sign
 meaning kinetic energy) and the second is for photons. The material number is
 given in the fourth numerical field.  For details on all other parameters,
 and for other possibilities (for example how to introduce a transport cutoff
 different from production threshold) the user should accurately consult the
 Notes to EMFCUT.
 In a name-based input, the above card could be:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
 EMFCUT        -0.010     0.010       1.0  BERYLLIU                    PROD-CUT

 Production and transport threshold for all other particles can be overwritten
 using the PART-THR command.

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