[fluka-discuss]: Release of Fluka2011.2c

From: Alfredo Ferrari <alfredo.ferrari_at_cern.ch>
Date: Mon, 20 Oct 2014 15:41:31 +0200

Dear Fluka users

A new fluka subversion, fluka2011.2c, has been just pushed to the web site.

This release contains a few small fixes, and some physics changes,
in particular a significant improvement for anti-nucleon annihilation and
negative pion and muon capture in compounds. Most of the fixes and/or
physics changes are likely to be irrelevant for the majority of the users,
however it is safer and recommended to immediately move to Fluka2011.2c. No
debugging/maintenance/assistance will be provided for older versions.


- When treating anti-nucleon annihilation, negative pion and negative
   muon absorptions on mixtures, the evaluation of the relative
   probability of annihilation/capture on different target
   components has been switched from a naïve “Z law” to more sound
   approaches (following a suggestion by N. Bassler)

- Stopping power in gaseous Helium (following a post by Luke Bird):
   The Ziegler fitting coefficients for gaseous helium have
   been implemented (in addition to those for liquid He) and are
   automatically applied when the defined helium is gaseous (as the
   default FLUKA HELIUM is).

- Stopping power in graphite vs amorphous carbon: the distinction has
   been implemented following the NIST recipe, however given the very
   close densities (1.7 vs 2.0), the user must be aware that for
   carbon the code will choose the one closer to the input density
   (eg for rho > 1.85 will use amorphous carbon, below graphite)

- Improved fit to the reaction cross section for protons on very heavy
   targets (following a post by Francesco Rossetto). The previous
   parametrizations was increasingly too high for Z >= 90


- Fixed possible crash in the evaporation stage for extremely excited
   superheavy fragment (following a post by Jeremy Northum)

- Fixed possible crash (insufficient stack dimensions) when using PEANUT
   at energies above several TeV (following a post by H. Vincke)

- Fixed inconsistency in reading repetitive LOW-MAT cards for
   the same material not immediately following each other (following a
   post by Sophie Mallows)

- Fixed rare bug in virtual photon interactions (following a
   post by Joshua Albert)

- Fixed bug in the treatment of biasing of bremsstrahlung by positrons.
   (apparently never met by anybody)

- Maximum number of USRTRACK estimators increased to 500

The standard FLUKA references change starting with this release:

The use of the FLUKA code must be acknowledged explicitly by quoting
at least the following set of references

     - A. Ferrari, P.R. Sala, A. Fasso`, and J. Ranft,
      "FLUKA: a multi-particle transport code",
       CERN 2005-10 (2005), INFN/TC_05/11, SLAC-R-773

     - T.T. Böhlen, F. Cerutti, M.P.W. Chin, A. Fassò, A. Ferrari,
       P.G. Ortega, A. Mairani, P.R. Sala, G. Smirnov and V. Vlachoudis,
       "The FLUKA Code: Developments and Challenges for High Energy and
       Medical Applications", Nuclear Data Sheets 120, 211-214 (2014)

As usual assistance/help will be provided only for the latest version. All
users are invited to update as soon as possible.

    The FLUKA developer team

| Alfredo Ferrari || Tel.: + |
| CERN-EN/STI || Fax.: + |
| 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch |
| Switzerland || |
Received on Mon Oct 20 2014 - 17:13:05 CEST

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