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MUPHOTON


    controls muon photonuclear interactions

    See also PAIRBREM, PHOTONUC

     
WHAT(1)
: flag to switch on muon nuclear interactions: = -1.0 : muon nuclear interactions are not simulated = 0.0 : ignored = 1.0 : full simulation of muon nuclear interactions and production of secondary hadrons = 2.0 : muon nuclear interactions are simulated but no secondary hadron is produced; the energy lost by the muon is deposited at the point of interaction
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 virtual 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 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
SDUM
: not used
Default
(option MUPHOTON not given): muon nuclear interactions are not simulated
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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