=== Fluka-4.3.2 ===

PHYSICS IMPROVEMENTS:

- The hitherto missing decay products of 11Be have been added, thus addressing
  the issue raised in
  https://fluka-forum.web.cern.ch/t/spallation-isotope-decays/4199

- The reaction cross section for proton on B has been extended below 1 MeV, thus
  addressing the 5th item in
  https://fluka-forum.web.cern.ch/t/interaction-of-proton-beam-with-thin-boron-targets-which-iontrans-should-i-use/4133

TECHNICAL IMPROVEMENTS:

- C++ header files are now provided for the FLUKA commons.

- The maximum number of heavy secondaries emitted during nuclear evaporation has
  been increased to 120, in order to accommodate a large (yet physical) number
  of heavy secondaries observed during a rare nuclear interaction between heavy
  nuclei which led to a crash in previous versions of the code.

- The FLUKA manual features newly formatted tables and several typo and error
  corrections.

BUG FIXES:

- The code is now aligned with DPMJET v19.3.5, fixing a rare crash due to a
  slightly mismatching value of the nuclear mass unit.

- A logic error which allowed elastic recoils (and in general recoils with A and
  Z equal to those of the target nucleus) to mistakenly contribute to RESNUCLEi
  scoring in the region where they originate has been rectified.

- A rare numerical precision error which led to a slight inaccuracy when
  determining the azimuthal-angle bin in cylindrical USRBIN for particles
  traveling along the x axis (and eventually to a crash, kindly reported by BNL
  colleagues) has been fixed.

- An underflow in the ionization fluctuation module, which manifested as a
  zeroing out of ionization losses for charged particles in very dilute gases,
  has been resolved.

- The energy deposition quenching issue for biased runs raised in
  https://fluka-forum.web.cern.ch/t/energy-scoring-along-step-in-user-routine-biasing-and-particle-weight/4006
  has been corrected, thus superseding the temporary solutions proposed therein.

=== Fluka-4.3.1 ===

PHYSICS IMPROVEMENTS:

- Reworked the sampling of the target nucleus thermal motion for the elastic
  scattering of thermal neutrons. This corrected an artifact that led to neutron
  fluxes slightly skewed towards energies lower than kT, affecting in particular
  light target nuclei.

- The parametrized reaction cross section of protons on deuterium below 5.5 MeV
  was refined to better reproduce experimental data available from EXFOR for the
  (p,g) and (p,n) channels, removing an unphysical rise below few MeV.

TECHNICAL IMPROVEMENTS:

- Nuclear recoils with the same atomic and mass number as the target isotope
  (e.g. from (n,el), (n,n'), (p,p'), etc.) now contribute to RESNUCLEi scoring
  only when reaching a different geometry region.

- Kshort and Klong scorings now also include the respective contribution of K0
  and K0bar, and viceversa.

- A simplified version of mgdraw (mgdraw_empty.f) is now offered for
  convenience, in addition to the original mgdraw.f.

BUG FIXES:

- Fixed a bug affecting point-wise fission events by low-energy neutrons,
  removing the spurious survival of the projectile.

- Fixed a bug whereby deuterium content was suppressed from natural hydrogen
  when requesting thermal scattering via the S(a,b) treatment.

- Two bugs were addressed in the crystal channeling module concerning the volume
  acceptance region:
   - Fixed a misbehavior in the limit case of straight crystals;
   - Fixed a spurious decrease of the nuclear interaction rate.

- Fixed a rare bug manifesting when the code was trying to recover a geometry
  tracking failure and parentheses were used in the region description,
  addressing
  https://fluka-forum.web.cern.ch/t/unexpected-geofar-tracking-errors/3627

- Fixed an error introduced in v4-3.0 affecting the scoring of the restricted
  NIEL (RES-NIEL).

- Fixed improper account of optical photon sensitivity for local energy
  depositions, addressing the issue reported in
  https://fluka-forum.web.cern.ch/t/sensitiv-card-in-optical-photon-production

- Fixed unintended passage through scoring routines after unsuccessful (i.e.
  rejected during sampling) electronuclear event, addressing the issue reported
  in https://fluka-forum.web.cern.ch/t/mgdraw-f-endraw-routing-quenching

- Fixed numerical excursion into negative kinetic energies in electric field
  tracking when particles reach a turning point, addressing the issue reported
  in https://fluka-forum.web.cern.ch/t/error-stop-etrack-xm/
  and fixing an index out of bounds.

=== Fluka-4.3.0 ===

This major release contains several physics improvements, as well as the further
technical improvements and notable bug corrections listed below. Among the
former ones, the inclusion of a novel point-wise treatment for low-energy
neutron interactions (below 20 MeV) should be particularly highlighted, since it
overcomes a longstanding lack and considerably extends the applicability of the
code.

The code manual has been recast in restructured text format, providing the user
with three consistent versions: text, pdf, and html. The latter is accessible at
https://flukafiles.web.cern.ch/manual .

PHYSICS IMPROVEMENTS:

- A new point-wise treatment has been developed for the interactions of
  low-energy neutrons (below 20 MeV), relying on the Evaluated Neutron Cross
  Section Libraries for the Geant4 code: https://www-nds.iaea.org/geant4 .

  The pre-existing group-wise treatment remains available by default and can be
  adopted in mixed group- and point-wise calculations.

  The LOW-PWXS card enables the new treatment on an elemental material basis,
  allowing the user to select among the full isotope list in the various neutron
  libraries to be downloaded from https://flukafiles.web.cern.ch/neutron .

  The same card offers the possibility to apply Doppler broadening at arbitrary
  temperatures and to request S(alpha,beta) treatment to account for molecular
  binding effects.
  As opposed to the group-wise treatment, reaction products - including
  residuals - are explicitly generated in a correlated manner. Fission fragments
  are sampled from the library or, if missing, by means of the Wahl systematics.

  Special attention has been devoted to minimize the intrinsic CPU cost.

- The code is now aligned with DPMJET v19.3.2, as distributed at
  https://github.com/DPMJET/DPMJET , which fixed spurious features in
  kaon spectra from nucleus-nucleus collisions at energies of ~10 GeV/n.

- Scoring of athermal-recombination-corrected displacements per atom (arc-DPA)
  has been added, following Eqs. 6-7 of

  K. Nordlund et al., Nature Communications 9 1084 (2018),

  requiring two new user-specified parameters, as detailed in the MAT-PROP card
  documentation.

  Generalized particle DPA-NRES (#245) has been deprecated and replaced by the
  Norgett-Robinson-Torrens DPA-NRT.

- The emission of synchrotron radiation photons along charged particle steps, in
  vacuum regions subject to a magnetic field, has been implemented and can be
  requested with the dedicated SYRASTEP card.
  Note that the related SYNC-R.. options of SPECSOUR remain available, although
  they may be more naturally and effectively superseded by the use of the
  former.

- Mass distribution of 226Ra fission fragments was corrected, addressing
  https://fluka-forum.web.cern.ch/t/comparison-of-mass-yield-distribution-for-fission-products/2649

TECHNICAL IMPROVEMENTS:

- The new DETGEB card allows the user to apply a Gaussian broadening to energy
  deposition spectra scored with the DETECT card.

- The maximum number of regions of interest (ROI) in voxel geometries has been
  increased from 100 to 400.

- In the source_newgen.f user routine, sampling from a spectrum file (energy,
  intensity) was added.

BUG FIXES:

- Fixed faulty branchings for Auger, XR and CE radiation products in decays of
  the following nuclides/isomers
	- 83mKr, 94mNb, 132mI, 138mCs, 151mTb, 164mHo, 205mPb
	- 57Mn, 101Mo, 105Sn, 111Pd, 120Xe, 123Cs, 174Ta, 228Ra, 230Pa, 247Cf
  addressing
  https://fluka-forum.web.cern.ch/t/70-additional-electrons-appearing-in-beta-decay/3451

- Unphysical forward/backward CM asymmetry in symmetric nucleus-nucleus
  collisions simulated by DPMJET was removed.

- A sampling bug in the original synchrotron radiation special source was fixed.

- In the source_newgen.f user routine, unexpected behaviour for annular sampling
  was fixed.

=== Fluka-4.2.2 ===

PHYSICS IMPROVEMENTS:

- Shell and pairing effects adjustment in the course of the IntraNuclear Cascade
  (already implemented since FLUKA 4-2.0).

- A typo in the RELEASE-NOTES for FLUKA 4-2.0 has been fixed: the proton
  reaction cross section refinement for {63,65}Co should have read
  {63,65}Cu.

BUG FIXES:

- Fixed the unexpected behavior reported in
  https://fluka-forum.web.cern.ch/t/different-results-from-same-input-on-2-computers/2733
  due to a spurious setting in the pre-equilibrium stage of FLUKA's
  hadron-nucleus inelastic interaction module.

- Fixed a rare crash reported in
  https://fluka-forum.web.cern.ch/t/running-errors-abort-called-from-deusev-reason-np-0-before-nuceaz
  due to a bookkeeping error for biased low-energy nuclear projectiles with A>2
  on 2H in inverse kinematics.

- Fixed the gamma double counting reported in
  https://fluka-forum.web.cern.ch/t/cd-109-decay-radiation-photon-emission-probability/2571/5
  due to the attribution of decay products of 109*Ag to 109Cd too.

- Fixed a bug which truncated multiple Auger-electron emission from
  radionuclides to a single one.

- The offset of a magnetic field prescribed in the input card MGNCREAT now
  applies not only to field maps, but also to analytical magnetic fields.

- A missing transformation matrix has been introduced to correctly apply the
  azimuthal angle prescribed in the MGCNREAT card.

- Whereas in previous versions the MGNDATA and MGNFIELD cards had to appear
  after the MGNCREATE card to properly work, now they are position-independent.

- A meaningful abort message is now written to the output file if no field data
  are given in case a 2D/3D field map is requested.

- Fixed an incorrect region indexing in the magnetic field acquisition in case
  lattice indices started from a value different from 1.

- Increased upper energy limit for stopping power tabulations so as to
  accommodate high-energy protons generated in relativistic ion collisions.

- The source.f user routine now initializes the age variable (AGESTK) also in
  the case of radioactive-isotope decay, fixing the issue reported in
  https://fluka-forum.web.cern.ch/t/using-tcquench-together-with-source-subroutine/2559

=== Fluka-4.2.1 ===

PHYSICS IMPROVEMENTS:

- 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
       Technology,
       Nuclear Data Sheets, Volume 155, 2019, Pages 1-55, ISSN 0090-3752,
       https://doi.org/10.1016/j.nds.2019.01.002.

TECHNICAL IMPROVEMENTS:

- Following the user request under
  https://fluka-forum.web.cern.ch/t/eventbin-directly-into-histogram/2523
  the maximum number of DETECT scorings has been increased from 20 to 100.

BUG FIXES:

- Fixed geometry error reported in
  https://fluka-forum.web.cern.ch/t/unknown-geometry-error-causing-run-stop/2400
  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
  https://fluka-forum.web.cern.ch/t/error-while-using-218po-isotope-source/2470
  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
  https://fluka-forum.web.cern.ch/t/stop-invalid-whydr/2416
  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
  https://fluka-forum.web.cern.ch/t/finished-with-errors-running-normally-with-half-time/2457

- 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.

=== Fluka-4.2.0 ===

This release contains several improvements and bug fixes as listed in the
following. Among the first ones, the inclusion of low energy deuteron
interactions and the availability of state-of-the-art dose equivalent conversion
coefficients are of particular significance.

With this release, the embedded DPMJET package is now aligned with the
DPMJET-III version 19.2.0 officially distributed at
  https://github.com/DPMJET/DPMJET

Linux users of gfortran 11 (who should download the gfor9 precompiled
package of FLUKA, as indicated in the installation guide under
https://fluka.cern/documentation/installation ), should avoid
subversions older than 11.2, which are known to miscompile. Please
update to gfortran 11.2.
(All other Linux users with gfortran from 7 to 10 are not affected by
this issue).

PHYSICS IMPROVEMENTS:

- An effective model for nuclear reactions of low energy (< 150 MeV/n) deuterons
  has been included, accounting for stripping to the continuum, stripping to
  discrete levels (for a selection of light isotopes), and deuteron elastic
  break-up. This overcomes a very long-lasting lack that in the past was crudely
  treated by adding in the input file a PHYSICS card requesting IONSPLIT for
  deuterons. In order to engage the new model, as recommended, such a
  PHYSICS/IONSPLIT card has to be removed. Although this new interaction model
  has been reasonably tested, residual bugs or misbehaviors cannot be excluded:
  thanks in advance for reporting them on https://fluka-forum.web.cern.ch/! As a
  control measure, a PHYSICS card with SDUM=LOWDEU allows to switch off
  low-energy deuteron nuclear reactions altogether (not recommended). For
  deuteron-beam interactions on deuterium, tritium, and helium, the model
  performances are still tentative and the use of a user-customized source
  routine describing independently the interaction products may remain
  preferable.

- A deuteron preformation mechanism is now accounted for in the course of the
  intranuclear cascade and pre-equilibrium stages of a hadron-nucleus
  interaction, provided a PHYSICS card is input with SDUM=COALESCE (as
  recommended for several purposes). This improves the excitation functions of
  reactions like (p,d)/(p,pn) and (n,d)/(n,np) on light nuclei at low and
  intermediate energies, as illustrated in Nuclear Data Sheets 120 (2014)
  211–214 (Fig. 4).

- The explicit generation and transport of alpha particles from the decay of
  radioactive nuclei are now performed.

- The nuclear reaction cross section of protons has been refined in the
  near-threshold region for {50,52,53,54}Cr, {54,56,57,58}Fe, {60,61}Ni,
  {63,65}Cu, {92,94,95,96,100}Mo, and 184W.

- Optical photon generation by local sub-threshold energy deposition events is
  now accounted for, addressing the behavior reported in
  https://fluka-forum.web.cern.ch/t/opt-prod-scintillation-light-production-doubt/2130

- Further dose-conversion coefficients are now available (see the manual for
  more details):

  - Coefficients for effective dose from ICRP Publication 116 for photons,
    neutrons, electrons, positrons, protons, charged muons, charged pions and
    alpha particles.

  - Ambient dose from ICRU Report 95 for photons, neutrons, electrons,
    positrons, protons, charged muons, charged pions and alpha particles.

  - Personal dose from ICRU Report 95 for photons, neutrons, electrons,
    positrons, protons, charged muons, charged pions and alpha particles for
    different irradiation geometries.

  - Directional and personal absorbed dose in the lens of the eye from ICRU
    Report 95 for electrons, positrons, neutrons and photons.

  - Directional and personal absorbed dose in the local skin from ICRU Report 95
    for photons, neutrons, electrons and positrons on the slab phantom.

TECHNICAL IMPROVEMENTS:

- Two new cards (MGNCREATe and MGNDATA, see the manual) have been added,
  allowing for the definition of multiple custom magnetic fields, either
  analytical for the most common fields (from dipole up to decapole),
  interpolated in 2D or 3D, or a combination of both (analytic in the so-called
  core region and interpolated outside), allowing to exploit mirror symmetries
  if applicable.

- An unnecessary restriction in regard to the SPECSOUR use was lifted, which was
  preventing to simulate interactions on a target particle at rest.

- All post-processing tools (bin/us*, bin/gplevbin, and bin/detsuw) now make use
  of dynamic memory allocation.

- A new processing tool (usbscw) is available in order to add USRBINs from
  different study cases with respective weights. This applies for instance to
  independent source terms, such as for separate electromagnetic dissociation
  and nonelastic interaction SPECSOUR runs (to be weighted by the respective
  cross section), or synchrotron radiation emission from different circular arcs
  or helical paths.

BUG FIXES:

- Fixed a crash occurring when ions with high transport threshold were ranged
  out in a material with low delta-ray production threshold.

- Fixed rare crash in kaon-nucleon elastic and charge-exchange interaction.

- Fixed DETECT card misbehavior reported in
  https://fluka-forum.web.cern.ch/t/error-with-the-coincidence-scoring-using-detect-card/2173

- Fixed crashes occurring in the de-excitation of super-heavy systems generated
  by nucleus-nucleus interactions in rQMD.

- Fixed a series of rare rQMD crashes, including those reported in
  https://fluka-forum.web.cern.ch/t/why-the-running-failed-in-xe-u-while-no-error-before-the-running/2181

- In the aftermath of a nucleus-nucleus nuclear interaction in rQMD, corrected a
  Lorentz boost loss of precision due to a small transverse momentum component.

- Fixed exponential overflow in the evaporation module occurring in a
  nuclear inelastic interaction between heavy ions.

- In the crystal module, particles entering the crystal with an angle at the
  limit of the volume reflection acceptance and approaching the channeling
  acceptance exhibited a spurious kick. This has now been fixed.

- A temporary treatment is now in place to fix a spurious volume-reflection kick
  in case of low delta-ray production thresholds in crystal regions.

- Added a protection for activity scoring in regions whose material is changed
  in the radioactive decay stage.

=== Fluka-4.1.1 ===

BUG FIXES:

- Fixed the issues reported in

  https://fluka-forum.web.cern.ch/t/run-aborts-with-stop-3500/1144

  including two further single-precision-induced crashes in rQMD which led
  respectively to a non-positive center-of-mass momentum and an array index
  out of bounds. Additionally fixed a few rare crashes due to uninitialized
  nuclear spin and parity in the course of nucleus-nucleus collisions and
  electromagnetic dissociation involving exotic isotopes.

- Fixed rare crashes in the aftermath of sub-150-MeV/n nucleus-nucleus
  interactions going through complete fusion for heavy isotopes: instead of
  failing to deal with these systems in FLUKA's pre-equilibrium module, the code
  now treats them directly through its evaporation module.

- Fixed bookkeeping error in the propagation of spin and parity in inverse
  kinematics for nucleus-nucleus interactions such that the projectile nucleus
  is heavier than the target.

- Handling of possible pathological light fragments returned by BME.

- Fixed a rare crash due to a muon pair production event by a photon which led
  to a slightly negative target recoil energy.

- If NOMORE is set different from zero in the source.f user routine, the total
  kinetic energy and the total primary weight are now correctly printed in the
  output file (they were off by the contribution of the discarded event before).

- Fixed the DETECT card scoring crash reported in

  https://fluka-forum.web.cern.ch/t/detect-histogram-overflow-and-error-code-rc-144/1357

  removing at the same time the "Detect: Histogram overflow" warnings formerly
  appearing when the deposited energy exceeded the upper limit of the
  DETECT-card histogram.

=== Fluka-4.1.0 ===

PHYSICS IMPROVEMENTS:

- Spin and parity of the compound nucleus are now accounted for during the
  evaporation and Fermi break-up stages.

- Photonuclear cross sections on 46Ti, 48Ti, 181Ta, and 208Pb have been
  slightly adjusted in the Giant-Dipole-Resonance region to remove spurious
  features.

TECHNICAL IMPROVEMENTS:

- An additional version of the source routine, source_newgen.f, with a cleaner
  structure that facilitates access to newcomers and several built-in options,
  has been made available as beta release in the src/user/ directory. (The
  traditional source.f is still fully operational and preexisting
  user-customized source routines remain totally compatible).

- The usrmed.f user routine has now three additional arguments (TXXPOL,
  TYYPOL, and TZZPOL) carrying the particle polarization direction.

- The sixth parameter (WHAT(6)) of the GLOBAL card, interpreted as REAL*8
  units, now allows the user to customize the size of the blank common.

- Prompt and decay electromagnetic transport thresholds, as possibly altered
  by the RADDECAY card, are now explicitly written in the output file.

BUG FIXES:

- As an unintentional side effect of the photofission restoring in 4.0,
  an excessive fission yield was reported for some material (e.g. Ta).
  This has now been cured.

- The two crashes reported in
  https://fluka-forum.web.cern.ch/t/crash-with-index-error-and-floating-point-exception/879
  have been solved.

- In the SPOTBEAM card, flat angular divergences along X and Y directions
  appeared swapped and angles were misinterpreted as half-angles (instead of full
  angles). The respective corrections have been implemented.

- The crash reported in
  https://fluka-forum.web.cern.ch/t/some-runs-are-failing-kaskad-reason-engw-0-ekres-0/1011
  (due to an uninitialized variable in a low-energy proton reaction) has
  been solved.

- Ions channelled in a bent-crystal now experience the suppression of
  large-angle single scattering, previously not active.

- The angular distribution of photoelectrons generated by polarized photons
  has been restored.

- Two rare PEANUT crashes, leading respectively to an index out of bounds
  and to an undefined particle mass, have been solved.

- XSIZERO and AXSIZERO are no longer included in the HAD-CHAR generalized
  particle.

- The rare crash reported in
  https://fluka-forum.web.cern.ch/t/ubchck-error-regarding/1098
  (due to a misinitialized tolerance in USRBIN scoring) has been fixed.

==========================================================================

=== Fluka-4.0.1 ===

BUG FIXES:

- Prevented USRBIN apportioned scoring of NET-CHRG, RES-NUCL, and annihilation
  at rest of positrons (all are point-like quantities).

- Now stopping (instead of looping forever) for empty input file.

- Fixed optical photon crash.

- Fixed rare crash in rQMD leading to an index out of bounds error.

- Fixed rare crash in rQMD leading to zero center-of-mass momentum.

- Fixed index-out-of-bounds in usysuw.f and raised the maximum number of
  first-quantity bins to 5000.

- Fixed bug in USRBIN scoring which resulted in zero by-region scoring.

- Fixed bug in SPOTTRAN: handling of transformation #2.

- In the crystal tracking module, corrected a missing factor Z
  (projectile charge) when the electrostatic potential is calculated in
  the volume zone for ions.

- When computing the electrostatic potential for a charged particle in a
  crystal volume zone, the contributions from the charge distribution of
  the four nearest crystal planes are now considered (instead of just
  the two nearest planes).

- Lifted an excessively cautious abort in case of nuclear cross-section was not
  initialized for new particle species resulting from ion fragmentation in the
  crystal channeling module.

- Lifted condition which inhibited the dechanneling in case of volume captured
  particles in the crystal channeling module.

=== Fluka-4.0.0 ===

PHYSICS IMPROVEMENTS:

- Charged particle transport in electric fields has been implemented, as far as
  vacuum regions are concerned. See the ELCFIELD card and the src/user/elefld.f
  user routine.

- Anisotropic effects in crystals have been modeled for positively charged particles,
  including channeling, dechanneling, volume reflection and volume capture. See the
  CRYSTAL card.

- Electronuclear reactions have been enabled. See the PHOTONUC card with
  SDUM = ELECTNUC. The Electric Quadrupole (E2) contribution to the virtual photon
  spectrum, applying also to muon photonuclear reactions and ion electromagnetic
  dissociation, has been added.

- Direct (p,n) reactions to the Isobaric Analogue State of several target isotopes
  (27Al, 40Ar, 42,44,48Ca, 51V, 90Zr, 120Sn, 208Pb, 209Bi) have been implemented
  and substantially improved (7Li and 9Be) from threshold up to a few hundred MeV,
  accounting for monoenergetic peaks in the emitted neutron spectrum and yielding a
  particular improvement for 7Li and 9Be at forward angles.

- The near to threshold treatment of alpha reaction cross sections has been refined.
  Moreover, reaction cross sections of alpha particles on light nuclei (12C and 16O) have
  been corrected around the 1-GeV minimum so as to improve the agreement with experimental
  data in F. Horst et al., PhysRevC 96 024624 (2017) and F. Horst et al., PhysRevC 99
  014603 (2019).

- The BME event generator, describing ion-ion interactions below 150 MeV/n, has been
  interfaced to the PEANUT pre-equilibrium for cases outside the domain of the pre-
  computed BME database, yielding a particular improvement for the excitation functions
  of heavy residues produced by low energy alphas. Moreover, it has been extended to 3He
  and 3H induced reactions (on A>5 nuclei).

- The RQMD event generator, describing ion-ion interaction between 0.1 and 5.5 GeV/n
  (partially overlapping the BME and DPMJET energy ranges), has been interfaced to the
  PEANUT pre-equilibrium, prior to the final de-excitation stage of hot fragments,
  improving its accuracy.

- Photofission has been eventually restored, including electron and positron
  photonuclear reactions.

- (Anti)Neutrino cross sections have been revised.

TECHNICAL IMPROVEMENTS:

- Parenthesis expansion in region definitions is evaluated runtime, if it results
  in too many terms at initialization.

- A spatially distributed source can be defined from a USRBIN output file by means of
  the new SDUM = BIN-SOUR of the SPECSOUR card.

- Multiple beam spots can be defined by means of the SPOTBEAM, SPOTDIR, SPOTPOS and
  SPOTTRAN cards, allowing treatment planning system simulations.

- Dynamic memory allocation has been implemented. E.g. scoring grids requiring more
  memory than the default memory block reserved by FLUKA, which led to a program
  halt in earlier versions, are now automatically accommodated for (as long as
  sufficient RAM is available).

BUG FIXES:

- Typo correction in the neutrino interaction package.

- Corrected check of perpendicularity of REC axes.

- Corrected missing substitution of user defined variables in body continuation lines.

- Corrected rare crash in invariant mass check in the DPM interface.

- Corrected scoring of the generalized particles ALPHA-D and SQBETA-D.


==========================================================================

=== Fluka2011.3 ===

All FLUKA versions older than Fluka2011.2x.8 (included) are not compatible
with the present release distributed by CERN and will no longer be supported.

No debugging/maintenance/assistance will be provided for older versions.

The download and use of the FLUKA package distributed by CERN are governed by
a new license, which is available in the package.

Support for the present release is available from
          http://fluka.cern    and/or     http://cern.ch/fluka-forum

To propose modifications to the FLUKA source files, you can send a request
          fluka.team@cern.ch


BUG FIXES AND TECHNICAL UPDATES:

- The package structure has been completely changed (see the INSTALL for a
  description of the FLUKA structure)

- The name of the include files has changed (by removing the parentheses and
  adding the extension .inc). A python script fluka_src_converter.py, located
  in the bin directory, can be used to convert source files with the old
  convention of the include file name,

- No environment variables are needed to compile, link and run FLUKA executable

- A PEANUT bug, resulting in the error message NO CHANNEL SELECTED, has been
fixed

- A bug in electromagnetic dissociation, resulting in an abort at ion-ion
collision energies above the LHC ones, has been fixed