Last version:
FLUKA 2021.2.2, September 25th 2021
(last respin )
flair-2.3-0b 30-Jul-2021


-- Fluka Release
( 25.09.2021 )

FLUKA 2021.2.2 has been released.
Fluka Release 30.07.2021 FLUKA 2021.2.1 has been released.
Fluka Major Release 18.05.2021 FLUKA 2021.2.0 has been released.
Congratulations from INFN: ,
Dear Paola,
I wish to congratulate you and all the authors and collaborators for this new Fluka release, which looks at the future and confirms the support of INFN in the development and continuous improvement of this code.
best regards
Diego Bettoni
INFN Executive Committee

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controls muon photonuclear interactions


     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
               (" material WHAT(5)...")
               Default = WHAT(4)

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

     SDUM :    not used

     Default (option MUPHOTON not given): muon nuclear interactions
             are not simulated


  • 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.
 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:

 PAIRBREM         3.0       0.0    0.0005    COPPER    SILVER
 MUPHOTON         1.0       0.0       0.0    COPPER    SILVER

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