Release of FLUKA 4-2.1

Dear FLUKA users,

It is our pleasure to announce that a new minor release of the FLUKA code, FLUKA 4-2.1, has been issued and can be downloaded from the Official CERN FLUKA website.

See the release notes at the bottom of this message for a detailed account of all novelties. Many thanks to all users who reported the issues here addressed.

With our kindest regards,

The FLUKA developer team at CERN and collaborating institutes

=== Fluka-4.2.1 ===


  • TENDL reaction cross section for protons on 13C is now used below the 13C(p,n) threshold.

    Ref: A.J. Koning, D. Rochman, J.-Ch. Sublet, N. Dzysiuk, M. Fleming,
    S. van der Marck,
    TENDL: Complete Nuclear Data Library for Innovative Nuclear Science and
    Nuclear Data Sheets, Volume 155, 2019, Pages 1-55, ISSN 0090-3752.



  • Fixed geometry error reported in
    Unknown Geometry Error Causing Run Stop
    which was traced back to an occasionally incorrect setting of the initial position of optical photons from local/sub-threshold energy depositions.

  • Fixed a rare crash in electromagnetic dissociation event for virtual photons with energy below threshold for photonuclear reaction.

  • Fixed crash reported in
    Error while using 218Po isotope source
    whereby the kinetic energies of decay alpha particles were not systematically included in the tabulation of electronic stopping power done at initialization.

  • Fixed rare crash reported in
    Stop invalid whydr
    whereby the evaluation of the antiproton capture probability for 4He failed.

  • Fixed bug when setting up residual nucleus scoring for semi-analogue radioactive decay simulations.

  • Fixed bug leading to inconsistent memory allocation in auxiliary post-processing tools when the number of angular bins exceeded the number of energy bins, reported in
    Finished with errors(running normally with half time)

  • Fixed bug in SPECSOUR with SDUM=PPSOURCE, CROSSASY, or CROSSSYM which led to inconsistent results in case of first beam particles heavier than second beam particles.

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