Last version:
FLUKA 2021.2.5, February 18th 2022
(last respin )
flair-2.3-0b 30-Jul-2021

News:

-- Fluka Release
( 18.01.2022 )

FLUKA 2021.2.5 has been released.


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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

     WHAT(2)-WHAT(3) : reserved for code development

     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....+....8
 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....+....8
 PAIRBREM         3.0       0.0    0.0005    COPPER    SILVER
 MUPHOTON         1.0       0.0       0.0    COPPER    SILVER

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