MUPHOTON

    controls muon photonuclear interactions

    See also PAIRBREM, PHOTONUC

     
WHAT(1)
 : flag to switch on photonuclear interactions:
         = -1.0 : no muon photonuclear interaction
         =  0.0 : ignored
         =  1.0 : photonuclear interactions on and secondary hadrons produced
         =  2.0 : photonuclear interactions on but no secondary hadrons produced
         
Default
 = 1.0 if no DEFAULTS card is present, or if it is
                  present with 
SDUM
 = CALORIMEtry, NEW-DEFAults,
                  ICARUS or PRECISIOn.
                 = -1.0 otherwise

* Start_Devel_seq
     
WHAT(2)
 = ratio of longitudinal to transverse photon cross section
               Warning: for code development only, do not change!
               If changed the new value is applied to ALL materials.
               
Default
 = 0.25.

     
WHAT(3)
 = fraction of rho-like/VMD interactions ( must be < 1).
               Warning: for code development only, do not change!
               If changed the new value is applied to ALL materials.
               
Default
 = 0.75.
* End_Devel_seq
* Start_Prod_seq
     
WHAT(2)
-
WHAT(3)
 : reserved for code development
* End_Prod_seq

     
WHAT(4)
 = lower bound of the indices of the materials, or corresponding
               name, in which muon nuclear interactions must be simulated
               ("From material 
WHAT(4)
...").
               
Default
 = 3.0.

     
WHAT(5)
 = upper bound of the indices of the materials, or corresponding
               name, in which muon nuclear interactions must be simulated
               ("...to material 
WHAT(5)
...")
               
Default
 = 
WHAT(4)

     
WHAT(6)
 = step length in assigning indices. ("...in steps of
               
WHAT(6)
").
               
Default
 = 1.0

     
Notes:
         1) Other high-energy interactions of muons with nuclei (pair
            production, bremsstrahlung) are controlled by option
            PAIRBREM, which applies also to charged hadrons.

         2) Use of 
WHAT(1)
 = 2.0 (interaction without transport of the
            secondaries) gives the correct muon straggling but
            simulates only in an approximate way the energy deposition
            distribution. A similar approach is found in A. Van
            Ginneken's codes CASIM and MUSIM [Van75,Van86].

     Example (number based):

 * Explicit pair production and bremsstrahlung requested for heavy charged
 * particles in materials 12 and 13, provided the energy of the secondary
 * electrons and positrons is > 500 keV. No threshold is requested for photon
 * production. For muons, explicit nuclear interactions are also requested.
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
 PAIRBREM         3.0       0.0    0.0005      12.0      13.0
 MUPHOTON         1.0       0.0       0.0      12.0      13.0

     The same example, name based:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
 PAIRBREM         3.0       0.0    0.0005    COPPER    SILVER
 MUPHOTON         1.0       0.0       0.0    COPPER    SILVER

* Start_Devel_seq

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