Beta4.10.4-1.txt

                  Geant4 10.4-beta-01 Release Notes
                  ---------------------------------

                                                            30 June 2017

                 Migration Notes & Main New Features
                 -----------------------------------

  o Removed support for modulefile generation; expected that software stack
    managers will generate a modulefile file according to their requirements.
  o New structure for G4coutDestination functionality with division
    between sink and filter.
  o Renamed G4THitsMap to G4VTHitsMap and new collection types for hits.
  o Added G4MultiUnion class, importing original implementation for a
    multiple-union structure from the USolids library.
  o Added adapter class G4UAdapter for interfacing G4U* wrappers with VecGeom.
    Will replace G4USolid bridge class, deprecating USolids API in favour of
    direct use of VecGeom signatures. Requires version 0.4 of external
    package VecGeom.
  o Reviewed implementation of G4Box, G4Trap G4Trd and G4Para, made more
    compact and performant.
  o Reviewed G4FieldManager to revise behaviour of SetDetector(); it now
    passes the Field to the Equation, as is the natural user expectation.
  o Cleaned up destruction of allocated data at initialisation for
    split-classes in geometry and particles. Automatically deallocate
    thread-local singletons in geometry.
  o Updated particle properties according to PDG-2016.
  o New design with base class for all builders, to properly clean memory
    in MT mode.
  o G4GoudsmitSaundersonTable: new representation of the GS angular
    distributions (data size reduced from 16MB down to 5 MB).
  o Introduced in G4SauterGavrilaAngularDistributionusing more efficient
    algorithm of sampling using Penelope-2014 prescription; expected some
    speedup in simulation.
  o Added DAVIS model for optical physics.
  o New 'solidstate' module for processes, including channeling and phonon
    modeling.
  o New classes for elastic neutrino-electron scattering, for use in
    dark matter and neutrino experiments. Introduced new class for the
    cross-section of neutrons on atomic electrons and new model for
    neutron-electron elastic scattering.
  o Added new physics-list constructor G4ThermalNeutrons for addition of
    thermal neutron scattering below 4 eV.
  o Fixed significant memory usage in Bertini coalescence, observed with
    high-energy applications.
  o G4UniversalFluctuation: correction in order to get better E_mp and 
    FWHM in the case of small steps.
  o Fixed schema for replicas along angular axis. Updated GDML schema
    to version 3.1.5.
  o New tuning of the FTF model parameters; introduced smearing of delta-isobar
    mass and improved di-quark fragmentation into baryons in Lund string
    fragmentation. First implementation of rotating strings in FTF with
    introduction of Mt distribution of hadrons.
  o Major revision of the QGS final-state model (note: this was already
    included in 10.3.beta, but was not included in the final 10.3 release):
    implemented Reggeon cascading and "Fermi motion"; new algorithm for the
    determination of the kinematical properties of partons; improved formation
    of the residual nucleus.
  o Improvements in reading of de-excitation data.
  o Updated to VecGeom version 0.4 for optional solids modeling.
  o Updated to CLHEP version 2.3.4.4.
  o New data sets G4EMLOW-6.54, G4PhotonEvaporation-5.0, G4RealSurface-2.1.


 ----------------------------------------------------------------------------

                             Technical Notes
                             --------------- 

  o Tested platforms:
    + Linux, gcc-4.8.4.
      Tested on 64 bit architectures (Intel or AMD) with CERN CentOS
      Linux 7 (CC7) (based on CentOS Linux 7).
      Versions of Geant4 have also been compiled successfully on other
      Linux distributions, Ubuntu, Debian, Suse or other RedHat systems.
    + MacOSX 10.12, clang-3.8 (Apple LLVM/Clang-8.1.0)
       * For multi-threading on MacOSX, -clang- compiler has to be used.
    + Windows/10 with Visual C++ 14.0 (Visual Studio 2015)
       * Multi-threading mode currently -not- supported on Windows.

  o More verified configurations:
    + Linux, gcc-4.9.3, gcc-5.3.0, gcc-6.2.0, gcc-7.1.0, clang-3.9.
    + Linux, Intel-icc 16.0, 17.0.
    + MacOSX 10.11 with clang-3.7
    + MacOSX 10.10 with clang-3.6
    + Linux for Intel Xeon Phi with Intel-icc 16.0, 17.0
      (gcc-4.9/5.3 compatibility layer)

  o Geant4 10.4-beta-01 has been tested using CLHEP-2.3.4.4, required
    for external installation of the CLHEP library.

 Please refer to the Geant4 User Documentation:
   http://cern.ch/geant4/support/userdocuments.shtml
 for further information about using Geant4.

 ----------------------------------------------------------------------------

List of features and fixes included in this Beta release since 10.3.p01:

  o Configuration:
    -------------
    + CMake:
      o Removed support for modulefile generation, as not used and generated
        files not compatible with relocatability. It's expected that software
        stack managers will generate a modulefile file according to their
        requirements.
      o Added new module G4CMakeMain.cmake for refactoring core implementation.
      o Removed obsolete modules for interfaces provided by CMake built-in
        tools CMakeParseArguments, GNUInstallDirs and commands.
      o Refactored core Configure/Build and client script modules for clarity
        and cohesion.
      o Removed obsolete FindCLHEP.cmake module; updated internal/system
        CLHEP selection; simplified location/setup of system CLHEP as CLHEP
        (>= 2.3.3.0) now provides CLHEP_LIBRARIES set with appropriate
        single/granular targets with full usage requirements.
        Addressing enhancement request #1934.
      o Do not set or modify DYLD_LIBRARY_PATH in setup scripts on macOS.
        Addressing problem report #1960.
      o Added VECGEOM_DEFINITIONS and VECGEOM_EXTERNAL_INCLUDES when compiling
        with USolids/VecGeom enabled, to allow for detection of external
        packages paths from VecGeom. Corrected exporting of external packages
        paths from VecGeom.
      o Updated version of data sets:
        G4EMLOW-6.54, G4PhotonEvaporation-5.0, G4RealSurface-2.1.
        Updated tags for 10.4-beta.
    + GNUMake:
      o Corrected order of linkage in binmake.gmk for analysis global library.
      o binmake-gmk: added 'processses/solidstate' module include path.

  o Analysis:
    --------
    + Fixed problem of removing non-empty ntuple files in user application
      where ntuples are created after open file.
    + Added GetP[1,2]Id(const G4String&) functions to G4AnaysisManager.
      Addressing problem report #1949.
    + Corrected handling of open file failure.
      Addressing problem report #1957.

  o Digits & Hits:
    -------------
    + Renamed G4THitsMap to G4VTHitsMap: although G4VTHitsMap is not a pure
      virtual class, it has an additional template parameter for the map type,
      so it is not intended to be used directly; made G4VTHitsMap more generic
      in accepting the type of data stored (with more generic template overloads
      not specific to G4double and G4StatDouble).
      Fixed initialisation of G4StatDouble entries.
    + Added G4THitsMultiMap, which functions like G4THitsMap but all entries
      are stored.
    + Added G4THitsUnorderedMap, which functions like G4THitsMap but uses an
      unordered_map.
    + Added G4THitsUnorderedMultiMap, which functions like G4THitsMap but
      stores all entries in an unordered multimap.
    + Typedefs for map_type, value_type, iterator, and const_iterator
      for future generic usage.
    + Defined begin(), end(), cbegin(), cend() so now G4VTHitsMap can be used
      in range-based loops.

  o Event:
    -----
    + G4SPSPosDistribution: added GetRotx,y,z() access functions and other
      accessors for use by G4GPSModel for visualisation.
    + Fixed 'fallthrough' compilation warnings in case statements on gcc-7.1.

  o Externals:
    ---------
    + Adapted CMake scripts to new configuration for internal/external
      packages of CLHEP, expat and zlib.
    + Updated CLHEP module to version 2.3.4.4:
      o Fix in HepRotation::axis() for proper treatment of degenerating cases.
      o Fixed compilation warnings on gcc-7.1.
    + Zlib:
      o Disabled warning on fallthrough in case statements on gcc-7.1.

  o G3toG4:
    ------
    o Fixed compilation warnings on gcc-7.1.

  o Geometry:
    --------
    + biasing:
      o Added mutex locks to methods within G4IStore and G4ImportanceAlgorithm.
        Temporary fix for erratic behaviour in MT-mode and crashing if bounds-
        checking is switched on with many threads/events.
        Addressing problem report #1945.
    + magneticfield:
      o G4FieldManager: revised behaviour of SetDetector(); it now passes the
        Field to the Equation, as is the natural user expectation.
        The previous behaviour is possible, using extra argument 'failMode' 
        flag. Values: 0           = silent ; 
                      1 (default) = warning; 
                      2 or other  = fatal exception.
        If the field is changed for an existing, working stepper it must be
        propagated to the equation of motion.
        Note: Error reporting behaviour of SetDetector is 'soft'. It does not 
        complain by default if G4ChordFinder is not (yet) set (the default
        values of failMode is 0, i.e. quiet); if a chord-finder exists, it
        will still warn for other errors.
      o Renamed G4FieldManager::SetFieldChangesEnergy() method to
        InitialiseFieldChangesEnergy() to clarify its utility.
      o Corrected destructor in G4FieldManagerStore and added simple accessor
        to return singleton pointer.
    + management:
      o Added adapter class G4UAdapter for interfacing G4U* wrappers with
        VecGeom. Will replace G4USolid bridge class, and now deprecating
        USolids API in favour of direct use of VecGeom signatures and removal
        of one extra-level of indirection/inheritance.
        Requires new version 0.4 for VecGeom external library.
      o Renamed ambiguous name Extent() in G4VSolid to BoundingLimits().
        Modified G4ReflectedSolid accordingly. Change required in order to
        avoid signature conflict with VecGeom in G4U* wrappers.
      o Moved few key methods to be inline in G4USolid.
      o Fixed static memory leak from G4LogicalVolume, G4VPhysicalVolume and
        G4Region, for offsets allocated at initialisation.
      o Removed additional wrong lock in G4GeomSplitter for function
        SlaveReCopySubInstanceArray().
      o Added simple accessor to return singleton pointer for G4GeometryManager.
        Define IsGeometryClosed() as a static method, to avoid call to
        GetInstance(). Made related Boolean flag thread-local.
      o Enabled deletion of solids in G4SolidsStore destructor also for MT mode.
      o Added methods TriangelAreaNormal(), QuadAreaNormal(), 
        PolygonAreaNormal(), ClosestPointOnSegment(), EllipsePerimeter(),
        EllipticConeLateralArea(), comp_ellint_2() and
        ClosestPointOnTriangle() to G4GeomTools.
    + navigation:
      o Correction in destructors of G4TransportationManager and G4PathFinder.
        Avoid eletion of field-manager pointer in destructor of
        G4TransportationManager, as it is being deleted by G4FieldManagerStore.
        Added simple accessor to return singleton pointer for G4PathFinder and
        G4TransportationManager.
    + solids/Boolean:
      o Added G4MultiUnion class, importing original implementation for a
        multiple-union structure from the USolids library.
        Removed no longer necessary wrapper G4UMultiUnion.
      o Revised SurfaceNormal() in G4UnionSolid, to correctly return average
        normal if point is on common surface.
      o Renamed ambiguous name Extent() in all shapes to BoundingLimits().
      o Fixed minor Coverity defects to G4MultiUnion.
    + solids/CSG:
      o Reviewed implementation of G4Box, G4Trap, G4Trd and G4Para; made more
        compact and performant.
      o G4Trap: modified computation of side planes; bounding box/envelope
        are computed directly from side planes. Added CheckParameters() and
        MakePlanes(pt), simplified constructors and SetAllParameters().
        In G4UTrap, bounding box/envelope are computed directly from side
        planes as for G4Trap. Increased tolerance in the check of consistency
        of bounding boxes in Extent().
        Added private method GetVertices(), calculating vertices of the trap
        from its side planes; removed private methods GetFaceArea() and
        GetPointOnPlane(). Improved GetCubicVolume() and GetSurfaceArea();
        calculation of the volume and surface area is now done by using
        vertices calculated by GetVertices(). Improved/simplified other
        methods: StreamInfo(), MakePlanes(), MakePlanes(pt), Extent() and
        CalculateExtent(). Added more strict condition for trap definition
        in case when YZ section is a rectangle.
      o Fix in G4CutTubs::Inside() for case where inside points were concidered
        as points on surface. Addressing problem report #1973.
      o Fixed possible rounding off error in calculation of 'astep' (max angle
        for one step) in CalculateExtent() for G4Cons, G4Tubsm, G4CutTubs
        and related USolids wrappers.
      o Added accessor to G4Orb for retrieving cached max radius tolerance.
      o Renamed ambiguous name Extent() in all solids and G4U* wrappers to
        BoundingLimits().
      o Enabled adapter for VecGeom shapes in G4U* wrappers for: box, trap, trd,
        tubs cons and orb. From now on, wrappers depends directly on VecGeom
        shapes implementation.
        USolids API is deprecated and no longer supported.
    + solids/specific:
      o Renamed G4SurfaceVoxelizer to G4Voxelizer and extended to support
        voxelisation of shapes in 3D space. Adapted G4TessellatedSolid
        accordingly.
      o Revised implementation of GetCubicVolume() and GetSurfaceArea() for
        G4EllipticalTube, to return exact values.
      o Revised implementation of GetSurfaceArea() for G4EllipticalCone, to
        return exact value; moved both GetCubicVolume() and GetSurfaceArea()
        to be not inline.
      o Fixed possible rounding off error in calculation of 'astep' (max angle
        for one step) in CalculateExtent() for G4Polycone, G4GenericPolycone
        and related USolids wrappers.
      o G4SolidsWorkspacePool: implemented CleanUpAndDestroyAllWorkspaces(),
        to be called by worker threads. Removed declaration (i.e. not
        implemented) of protected method ReleaseAndDestroyWorkspace().
      o Removed potential race condition in G4VTwistSurface::AmIOnLeftSide().
        Addressing problem report #1972.
      o Renamed ambiguous name Extent() in all solids and G4U* wrappers to
        BoundingLimits().
      o Enabled adapter for VecGeom shapes in G4U* wrappers for: paraboloid,
        polyhedra, polycone and GenericTrap. From now on, wrappers depends
        directly on VecGeom shapes implementation. USolids API is deprecated
        and no longer supported.
    + volumes:
      o G4GeometryWorkspacePool: implemented CleanUpAndDestroyAllWorkspaces(),
        to be called by worker threads. Removed declaration (i.e. not
        implemented) of protected method ReleaseAndDestroyWorkspace().

  o Global:
    ------
    + New structure for G4coutDestination functionality with division
      between sink and filter. 
    + Removed obsolete internal definition of abs() in templates.hh.
    + Corrected TLS setup in tls.hh for gcc compiler.
    + Added function G4RandomDirection(G4double cosTheta) to
      G4RandomDirection.hh. Addressing enhancement request #1961.
    + G4TWorkspacePool: implemented CleanUpAndDestroyAllWorkspaces(),
      and Recycle() to be called by worker threads.
    + Fix in destructor of G4ThreadLocalSingleton to destroy mutex as last
      action. Fixes contention reported by Valgrind/DRD.
    + Changed date for release 10.4-beta.

  o Graphics Representations:
    ------------------------
    + Added implementation of G4Colour::operator+=(), as required by RayTracer
      in its use of G4THitsMap. Adding colours, without also taking brightness
      into account, does not make sense, so made it synonymous with operator=(),
      which is equivalent to covering the old colour with the new, like a coat
      of paint.
    + G4Colour: added Set functions for components.
    + Removed G4VisExtent::NullExtent.

  o Intercoms
    ---------
    + Fix to G4GenericMessenger::Command::SetUnit: do not ignore setting and
      issue a warning when running sequential application built against Geant4
      libraries compiled with MT enabled.

  o Materials:
    ---------
    + Added DAVIS model for optical surfaces. Use the new model with reflection
      and the capability of transmitting photons based on LUTs.
    + G4Material: improved printout; always print temperature and pressure 
      independently on the state of the material.

  o Particles:
    ---------
    + Updated particle properties according to PDG-2016.
    + Fixed inconsistency between enum definition of G4FloatLevelBase 
      and initialization of G4Ions::G4FloatLevelBase data.
      Addressing problem report #1968.
    + Fixed leak at construction for data allocated through G4ParticleDefinition
      for the sub-instance offset in the splitter. Added static method Clean()
      to G4ParticleDefinition, called as last in the destructor of
      G4ParticleTable.
    + Set life time to -1.0 for all stable particles.
    + Fixed Coverity defects.

  o Persistency:
    -----------
    + GDML:
      o Fixed schema for replicas along angular axis.
        Addressing problem report #1917.
      O Added possibility to specify material properties tables for optical
        surfaces. Addressing enhancement request #1947.
      o Added ability to export limited number of levels in the geometry
        hierarchy, by specifying this through the
        G4GDMLParser::SetMaxExportLevel(G4int) method.
      o Enabled import/export of G4MultiUnion as a native type, no longer
        bound to USolids module only.
      o New GDML schema version 3.1.5 (files: gdml.xsd, gdml_solids.xsd).
        Added general optical surface properties block to schema

  o Physics Lists:
    -------------
    + Builders:
      o New design with base class for all builders, to properly clean memory
        in MT mode; added c++11 compatibility; G4BuilderInterface renamed to
        G4PhysicsBuilderInterface and moved to run category. Removed unused
        class G4TheoModelFactory.
      o OrderingParameterTable: disabled PostStep multiple-scattering.
    + Constructors:
      o decay:
        - G4RadioactiveDecayPhysics: use a new method AddPhysics() instead
          of old AddMsc(). Set time limit for the de-excitation module
          the same as in G4NuclideTable, so only states from this table will
          be created as ions.
      o electromagnetic:
        - G4EmStandardPhysics_option3: use G4UniversalFluctuation2017
          for energy loss fluctuation of e+-, protons, anti_protons.
        - G4EmStandardPhysics_option4: set final step for all particles to
          10 um (except for GenericIon). Note: expected to slightly slow down
          the simulation but increase accuracy of range simulation.
        - G4EmStandardPhysicsWVI: use G4WentzelVIRelModel and
          G4hCoulombScatteringModel to take into account relativistic
          corrections.
        - G4EmStandardPhysics: use RayleighScattering and
          LivermorePhotoElectricModel.
        - G4EmStandardPhysicsSS: use G4hCoulombScatteringModel to take into 
          account relativistic corrections.
          Apply single scattering to all particles.
          Addressing problem report #1966.
        - G4EmParticleList: new class with the list of particles for which EM
          processes are instantiated
        - G4EmModelActivator: use new access methods RegionsPhysics() and
          TypesPhysics() instead of RegionsMsc() and TypesMsc().
          Fixed Opt4 and SS per region.
        - Added G4EmDNAPhysics_option6 constructor.
          Added elastic scattering process for ions to all DNA constructors.
        - Added Geant4-DNA stationary constructors.
      o gamma_lepto_nuclear:
        - G4EmExtraPhysics, G4EmMessenger, G4BertiniElectroNuclearBuilder:
          added option and UI command to enable/disable e+- nuclear process.
          Added extra UI commands to define cross-section factors for rare
          processes (requirement of ShiP experiment for dark matter search).
      o hadron_elastic:
        - G4ThermalNeutrons: new class for addition of thermal neutron
          scattering below 4 eV (backported from CMS simulation).
      o factory:
        - Added Geant4-DNA stationary constructors.
    + Lists:
      o Fixed problem in LBE physics-list for radio-active decay model.
      o G4PhysListFactory: fixed EM option "__SS".
        Addressing problem report #1966.

  o Electromagnetic Processes:
    -------------------------
    + DNA:
      o Added new CPA100 classes. Added new G4DNAPTB* classes and the structure
        of the new material management system.
      o Extended upper energy limit of protons for
        G4DNARuddIonisationExtendedModel.
      o Introducing G4PhysChemIO class.
      o Moved call to G4TrackList::Pop(track) from G4ITTrackingManager
        to G4ITTrackHolder and make sure track status is set to fStopAndKill
        when G4ITTrackHolder::PushToKill is called.
      o G4DNAMolecularMaterial: removed newly introduced methods; added fatal
        exception if used. Added doxygen documentation.
      o Added new G4DNADummyModel and allow the combination of G4VEmModel and
        G4VDNAModel in G4DNAModelInterface.      
      o Updated G4DNAModelInterface to correctly use G4DNAMolecularMaterial.
      o Requires data-set >= G4EMLOW-6.52.
      o Fixed compilation warnings on gcc-7.1.
    + Low Energy:
      o G4LivermoreNuclearGammaConversionModel, G4BoldyshevTripletModel:
        fixed file name to read data from G4LEDATA structure.
        Added possibility of triplet production; use G4Log; code cleanup.
      o Extended coverage of shell ionisation models.
      o Fix in G4LowEPPolarizedComptonModel.
      o G4LivermorePhotoElectricModel, G4LivermoreRayleighModel: minor code
        cleanup and optimisations.
      o Fixed resetting of pointer to nullptr in G4LivermorePhotoElectricModel.
        Addressing problem report #1980.
      o Fixed compilation warnings on gcc-7.1.
    + Muons:
      o G4MuBremmstrahlungModel, G4MuPairProductionModel: make all data members
        protected, allowing to reuse these classes as base for dark matter
        photons.
    + Standard:
      o G4GoudsmitSaundersonTable: new representation of the GS angular
        distributions (data size reduced from 16MB down to 5 MB).
        Requires new data-set G4EMLOW-6.53.
      o G4hIonisation: fixed min/max energy for dEdx table for the case when
        the mass of a hadron is very different from the mass of proton.
      o G4PairProductionRelModel: fixed inconsistency in calculating the LPM
        suppression for the pair-production model.
      o G4WentzelOKandVIxSection, G4WentzelVIRelXSection: added
        "ScreeningFactor" parameter to study accuracy of scattering models.
      o G4NuclearStopping, G4ICRU49NuclearStoppingModel: fixed nuclear stopping
        power computation.
      o G4SauterGavrilaAngularDistribution: introduced more efficient algorithm
        of sampling using Penelope-2014 prescription; expected that simulation
        will be faster.
      o G4UniversalFluctuation2017: new class including recent developments.
        Added corrections for better E_mp and FWHM in the case of small steps.
      o G4UniversalFluctuation, G4UniversalFluctuation2017: fixed numerical
        problem for very small steps for all particle types.
      o G4BetheHeitlerModel, G4PairProductionRelModel: minor change in angular
        sampling.
      o G4WentzelVIRelModel: fixed typo responsible for numerical crash.
      o G4BetheHeitlerModel, G4PairProductionRelModel: code cleanup and 
        optimisations; replaced remaining use of log, exp with G4Log and G4Exp.
      o G4eBremsstrahlungRelModel: use new interface to triplet model.
        Added class members and cross-sections for sampling of electron recoil.
      o G4WentzelOKandVIxSection, G4eCoulombScatteringModel, G4WentzelVIModel,
        G4hCoulombScatteringModel: code and interface cleanup.
        G4WentzelVIRelModel: use inheritance from G4WentzelVIModel.
        G4WentzelVIRelXSection: use inheritance from G4WentzelOKandVIxSection.
   + Utils:
      o G4EmParameters: added method with more correct name AddPhysics() 
        in order to replace AddMsc in future (no change in functionality).
        G4EmSaturation may be created at any moment (added mutex).
      o G4EmParametersMessenger, G4EmParameters: added parameter
        "ScreeningFactor", related modifiers and UI command.
      o Fixed Coverity defects.
      o G4VEmProcess: added DNA ionisation process to the list of discrete
        processes, which have auger and fluo flags for secondary particles.
        Added DNA ionisation process for hydrogen and helium to the list of
        processes, which have auger and fluo flags.
      o G4VEmModel: added extra protected class member for nuclear stopping.
        Added triplet model pointer and Get/Set methods.
      o G4EmCorrections: removed computation of nuclear stopping power.
      o G4EmCalculator: use interface of the process for the computation of
        the nuclear stopping power for discrete processes.
      o G4VEnergyLossProcess, G4LossTableManager: minor cleanup of inline
        methods. Fixed typo in G4EmSaturation.

  o Generic Processes:
    -----------------
    - Biasing:
      o G4GeometrySampler: removed unnecessary ClearSampling() from the
        destructor.
    + Management:
      o Use G4Log in G4VProcess.
    + Optical:
      o Added DAVIS model for optical physics. Use the new model with
        reflection and added capability of transmitting photons based on LUTs.
        Requires new data set G4RealSurface-2.1.
    + Scoring:
      o G4ParallelWorldProcess: G4Step of a parallel world now has a valid
        pointer to secondaries.
    + Solid State:
      o New module including channeling and phonon modeling.

  o Hadronic Processes:
    ------------------
    + cross_sections
      o G4NeutrinoElectronNcXsc: new class for the cross-section of elastic
        neutrino-electron scattering, for use in dark matter and neutrino
        experiments. Note that the cross section is small: ~10^-44 - 10^-42
        cm^2 in the neutrino energy range 1-100 GeV.
      o G4NeutrinoElectronCcXsc: new class for the cross-section of
        neutrino-electron inelastic interaction (charge current).
      o G4NeutronElectronElXsc: new class for the cross-section of neutrons on
        atomic electrons. Ultra-relativistic approximation of the Rosenbluth
        formula is used, as more relevant for detector applications.
        In particular, for dark matter searches, this process can produce
        electrons with high energy, if there are high energy neutrons (more
        than 10 GeV).
      o Added possibility of biasing these new cross-sections.
    + management
      o G4HadronicProcess: correctly check charge and energy balance in the
        case of e- internal conversion; improved initialisation for
        constructors.
    + models/abrasion
      o G4WilsonAbrasionModel: removed dependence on G4FermiBreakUp,
        G4Evaporation, and G4MultiFragmentation; not needed redefinition
        of default objects. Fixed case of crash at initialisation.
    + models/binary_cascade
      o Setting creator model for particles it creates; pass through time info.
    + models/cascade
      o G4CascadeCoalescence: removed clusterHash() function and 'triedClusters'
        registry. Droped redundant calls of tryCluster() with subcombinatorics;
        all combinations are handled, uniquely, in main loop over indices.
        This eliminates significant memory usage observed with high-energy
        applications of BERT.
      o G4CascadeParameters: use G4HadronicDeveloperParameters as a tool for
        sharing parameters between developers and experienced users.
        Need to set enviroment variable of "TEST_HDP" for testing the tool.
      o G4ElementaryParticleCollider::generateSCMmuonAbsorption: fixed case of
        rare segmentation-fault. Added clearing of particles if
        GetThreeBodyMomenta() returns no momenta.
    + models/coherent_elastic
      o G4NeutrinoElectronNcModel: new class for the final-state model of
        elastic neutrino-electron scattering, for use in dark matter and
        neutrino experiments.
      o G4NeutronElectronElModel: new model for neutron-electron elastic
        scattering. It produces recoil electrons resulting in visible energy
        deposition. The model is based on ultra-relativistic approximation of
        the Rosenbluth formula, since recoil electrons will have enough energy
        to be detected in the case of high energy neutrons, roughly > 1 GeV.
      o Fixed intialisation of data in G4NuclNuclDiffuseElastic constructor
        responsible for cases of zero scattering angle and no elastically
        scattered target particle. Addressing problem report #1979.
    + models/de_excitation
      o G4LevelReader, G4LevelManager, G4PhotonEvaporation: for stable states 
        (ground state isotopes) life time is set to "-1"; changed all checks 
        accordingly.
      o G4LevelReader, G4NuclearLevelData: removed code for reading of old 
        data structure
      o G4LevelReader, G4LevelManager, G4NucLevel, G4PhotonEvaporation: use
        G4double for energy and life time.
        Addressing problem report #1964. 
      o G4LevelReader: by default issue G4Exception only for Z<6,
        Fixed fill of 'mpRatio' parameter of a transition (was always zero
        before). Read updated data structure where "correlated_gamma"
        directory is located.
        Issue fatal exception if data file is not open.
        Addressing problem report #1942.
        Always create G4LevelManager for stable isotopes including light
        stable p, d, t, He3, He4.
      o G4LevelManager: removed obsolete method.
      o G4DeexPrecoParameters: set default time limit to 0.1s (if radioactive
        decay is enabled this time is set to the limit of the G4NuclideTable);
        this allows to not create extra isomers if radioactive decay is not
        included in the physics-list.
        Set default MaxLifeTime to 1000s (was 0.1s).
        Disable possibility to read old data; throw fatal exception soon if
        the first file in the dataset cannot be read.
        Disabled parameter change in G4_Idle state, now only allowed in
        G4_PreInit state. Disabled correlated gamma.
      o G4ExcitationHandler, fermi_breakup, photon_evaporation modules: 
        removed obsolete FermiBreakUp model and corresponding classes
      o G4ExcitationHandler, G4DeexPrecoParameters: define index of e- internal
        conversion and propagate it to reaction products
      o G4ExcitationHandler, G4NeutronRadCapture: propagate index of e- internal
        conversion to base class G4HadronicProcess.
      o G4ExcitationHandler: added protection from incomplete initialisation
        when external evaporation instance is defined; improved debug printout.
      o G4NuclearLevelData: synchronise the list of isotopes with the 
        current set of data files; extra rare isotopes are allowed; 
        Z max is extended from 102 to 117.
      o G4PhotonEvaporation: perform transition to the ground state of an
        isotope if the floating level has zero excitation energy.
        Always have gamma transition to the discrete level (if there is no
        levels, go to the ground state).
        Addressing problem report #1950.
      o G4PhotonEvaporation, G4ExcitationHandler: extended local debug printout
      o G4FermiFragmentsPoolVI: fixed selection of decay chains for
        unphysical fragments, which happens when used by INCL++.
      o G4VEmissionProbability: added private method for general treatment 
        of PDF functions
      o G4EvaporationProbability, G4CompetitiveFission, G4CompetitiveFission,
        G4GEMProbability: modified according to updated base class.
      o G4EvaporationChannel: make choice of minimal evaporation energy
        Z-dependent.
      o G4FermiFragmentsPoolVI: improved handling of internal data structure.
      o G4PolarizationTransition: added warning  in GenerateGammaCosTheta() and
        GenerateGammaPhi() when polarization entries are empty and return
        isotropic random in that case. Fixes rare crash.
        Added Jason warning of zero coefficient.
        Fix to avoid integer overflow in the argument of sqrt(), and caching
        to speed up the calculations. Use G4double, and std::sqrt().
      o G4GammaTransition: temporary workaround to avoid very long computations,
        by skipping polarization if initial state has angular momentum 2J > 6.
        Do not sample nuclear polarization if initial state has momentum
        2J > 12.
      o G4WilsonAblationModel: fixed case of crash at initialisation.
      o Fixed Coverity defects.
    + models/em_dissociation
      o G4EMDissociation: removed unnecessary explicit instantiation of
        FermiBreakUp, Evaporation and MultiFragmentation models.
    + models/lend
      o Fixed Coverity defects.
      o Fixed compilation warnings on gcc-7.1.
    + models/lepto_nuclear
      o G4NeutrinoElectronCcModel: new class for the final-state model of
        neutrino-electron inelastic interaction (charge current).
    + models/particle_hp
      o Added check for He3 projectile. Addressing problem report #1907.
      o Fix in destructor of processes to protect agains concurrent deletion.
      o Bug fix and improved stability in G4ParticleHPFinalState.
      o Suppressed unnecessary warning messages in G4ParticleHPEnAngCorrelation.
      o Fixed minor inconsistency between documentation and code.
    + models/parton_string
      o In the string fragmentation part of FTF, first implementation of
        rotating strings with introduction of Mt distribution of hadrons.
        Parameters are tuned using NA49 experimental data on pp-interactions.
        Good results are obtained for Pi+-, K+-.
        For P and Pbar <Pt> - xF correlations need still improvement.
      o Major revision of QGS model; implemented Reggeon cascading and
        associated "Fermi motion". Implemented new algorithm of parton
        kinematical properties determination and calculation of residual
        nucleus properties. Adjusted G4GammaParticipants to the revised
        model.
      o Improved energy-momentum conservation in the QGS model, especially
        in the case of diffraction interactions.
      o Major improvement to QGSM: Pomeron parameters are set up according to
        A.Kaidalov and M.Poghosyan (2009-2010). Non-vacuum reggeons: f and
        omega, are included in the calculations using parameters by A.Kaidalov
        and M.Poghosyan (2009-2010).
      o New class G4Reggeons for calculations of X-sections.
      o Cut non-vacuum reggeons are interpreted as a creation of a single
        string, or as a single string creation and one "stable" hadron.
        Such processes are described by RRR diagram of Reggeon phenomenology.
      o Introduced new class G4QuarkExchange for implementation of the
        processes.
      o G4QGSParticipants: implementation of Quark exchange simulation.
        Fix for nucleon state counter. Minor fix to avoid FPE observed only
        in optimized mode.
      o G4VPartonStringModel: throw exception for the case when string
        fragmentation does not produce hadrons.
      o Cleaned and improved G4SingleDiffractiveExcitation and
        G4QGSDiffractiveExcitation. Correction in G4SingleDiffractiveExcitation
        to treat h+N and Gamma + N diffraction.
      o Changed G4MesonSplitter probabilities UUbar DDbar (0.5, 0.5) to
        (0.8, 0.2) for gamma projectile.
      o G4QGSMSplitableHadron: fixed bug in the case of gamma projectile with
        P_minus = 0.
      o G4ExcitedStringDecay: bug-fix in FragmentStrings() method (access
        to the first element of an empty vector. Increased the number of max
        attempts to fragment strings from 10 to 100.
      o New tuning of FTF model parameters.
      o Introduced various <Pt^2> for diffractive and non-diffractive
        interactions in G4FTFModel, for NA49 and NA61/SHINE experimental data.
      o Fine tuning in G4DiffractiveExcitation for the FTF model, to describe
        NA49 experimental data, especially, <Pt> on Xf.
      o Fix to address the baryon puzzle of NA49 data; <Pt> of baryons 1/2 at a
        string fragmentation setting up at 435 MeV/c, and <Pt> for barion 3/2
        production st 900 MeV/c.
      o Fine tuning of G4LundStringFragmentation. <Pt> of mesons created at 
        quark fragmentation is decreased. <Pt> of baryons created at quark and
        di-quark is increased. Corrected fragmentation functions of qq-> B(1/2)
        and B(3/2).
        Re-organized and cleaned up code ; the variant is tuned using NA49
        experimental data on pp->p/pi/K +X.
      o Introduced smearing of delta-isobar mass; delta-isobars are now treated
        as a kinetic track; improved parameterisation of the quark exchange
        process with excitation.
        NA61/SHINE exp. data on Pi+, Pi-, K+, K- and protons in PP interactions
        at 20, 31, 40, 80 and 158 GeV/c are now described. Now reproducing the
        ratio of <Strane Q>/<Normal Q> in PP interactions. Not describing kink
        in AA interactions.
      o Improved di-quark fragmentation into baryons in Lund string
        fragmentation. Improved description of NA49 and NA61/SHINE exp. data
        on p+p->p+X. Improvements in method SetMinimalStringMass(), relevant
        for Pbar P annihilation.
      o Moved G4PomeronCrossSection class to 'qgsm' module.
    + models/pre_equilibrium
      o G4PreCompoundModel::ApplyYourself(): pass creator model and time.
    + models/radioactive_decay
      o G4RadioactiveDecay: added statement in DecayIt() to propagate weight of
        parent track. Addressing problem report #1946.
        Removed all cached variables.
    + models/theo_high_energy
      o G4TheoFSGenerator: pass through creator model and time.
    + models/util
      o G4Fragment: added non-const method NuclearPolarization() allowing to
        get non-const pointer to the G4NuclearPolarization object; fixed
        destructor and improved printout.
      o G4LegendrePolynomial: apply caching to speed up calculations.
      o G4PolynomialPDF: fix for potential division by zero.
    + util
      o G4GHEKinematicsVector: fixed case of variable shadowing.
      o G4NuclearPolarization: improved printout.

  o Run
    ---
    + Modified design of physics-lists for allowing cleanup of memory in MT
      mode. Introduced new class G4PhysicsBuilderInterface which all
      physics-lists builders inherit from.
      Worker threads now call G4VUserPhysicsList::TerminateWorker() to clean up
      physics-list thread-specific objects. G4VPhysicsConstructor holds list of
      TLS builders.
    + G4WorkerThread: use CleanUpAndDestroyAllWorkspaces() from workspace
      pools in DestroyGeometryAndPhysicsVector(). Minor code cleanup.
    + Delete G4TransportationManager, G4FieldManagerStore, G4GeometryManager
      and G4PathFinder singletons in G4RunManagerKernel, clearing static leaks
      at exit.
    + Transform G4VPhysicsConstructor split-class to adopt pointers.
    + G4MTRunManager, G4WorkerRunManager: protect against null pointer for
      SetUserAction() method.
    + Prevent adding multiple times the same sensitive-detector to the same
      logical volume via G4VUserDetectorConsturction::SetSensitiveDetector().
      In case skip and issue a warning.
    + G4RunManagerKernel: removed unnecessary warning message.
    + G4RunManager: notify visualization-manager when world volune is
      re-initialized.

  o Visualization:
    -------------
    + management:
      o Deprecated SetUserAction(). Use RegisterRunDurationUserVisAction().
      o Replaced G4VisExtent::NullExtent by G4VisExtent() throughout.
      o Added UI command '/vis/scene/add/gps'.
      o Improved commands guidance.
      o Fix to "/vis/viewer/interpolate" for file writing viewers.
      o Added G4VVisCommand::ConvertToColour. Now used throughout vis commands.
      o Added G4VVisCommand::ConvertToColourGuidance. This avoids having to
        repeat it for every command that uses it.
      o "/vis/viewer/save": added .g4view if an extension is not supplied by
        the user.
      o "/vis/viewer/set/defaultTextColour": changed default to blue and opaque
        to agree with default text vis attributes.
      o Added user-selected colour to "/vis/scene/add/gps".
    + modeling:
      o Added class G4GPSModel for visualisation of General Particle Source.
        Can be used with new UI command '/vis/scene/add/gps'.
        Added user-selectable colour.
      o Improved checking of G4PhysicalVolumeModel.
      o Added G4ModelingParameters::PVPointerCopyNo.
      o Improved arrow drawing. Reduced default 'lineSegmentsPerCircle' to
        6 for rapid yet adequate drawing. Similar improvement to magnetic
        field drawing.
      o Default can be changed with new command:
        /vis/set/arrow3DLineSegmentsPerCircle.
    + FukuiRenderer:
      o Expanded filename numbering to 4 digits. May need:
           export G4DAWNFILE_MAX_FILE_NUM=9999
        or setenv G4DAWNFILE_MAX_FILE_NUM 9999
        Useful if producing many files for a movie.
    + gMocren:
    + HepRep:
      o Fixed compilation warning on gcc-7.1.
    + OpenGL:
      o G4OpenGLViewer: minor improvement to picking (suppressing "no hits"
        message). Code cleanup.
      o G4OpenGLXViewer: Reverted to XA_RGB_BEST_MAP.
      o Fixed picking on MacOS, which was not working for retina display
        due to a screen factor *2.
      o Fixed compilation warning on gcc-7.1.
    + RayTracer:
      o Changed back to XA_RGB_BEST_MAP (seems OK now).
      o Simplified passing of ray-tracer pointer.
      o Fixed a bug whereby the jpeg for RayTracer was always 600x600.
      o Expanded filename numbering to 4 digits.
        Useful for producing many files for a movie.
    + VRML:
      o Fixed compilation warning on gcc-7.1.
    + externals:
      o Fixed compilation warning on gcc-7.1 in gl2ps.

  o Data Sets:
    ---------
    + G4EMLOW-6.54:
      o Improved and reorganized GS data.
      o Updated ecpssr shell cross section proton and alpha files.
      o Added G4DNA-CPA100 files.
      o Added PTB cross sections to dna module.
      o Updated ecpssr shell cross-section proton and alpha files.
    + G4PhotonEvaporation-5.0:
      o Removed old data; correlated_gamma files moved to main module.
    + G4RealSurface-2.1:
      o Added data for support of DAVIS model.
      o Updated and more compact LUT data.

  o Examples:
    --------
    + Updated reference outputs, macros, READMEs and scripts.
    + advanced/air_shower
      o Updated setup for visualization in main() and Visualisation.mac.
    + advanced/composite_calorimeter
      o Fixed compilation warning on gcc-7.1.
    + advanced/hadrontherapy
      o Corrected carbon beam line geometry and added new modulators.
      o Corrected definition of geometry region.
      o Added cuts definition in PhysicsList.
      o Removed HadrontherapyAnalysisManager class; now using G4tools
        in HadrontherapyMatrix.
      o RippleFilter geometry on PassiveCarbonBeamLine.
      o Added TIFPA beam line.
      o Removed local obsolete ion-ion physics-list. Cleanup of physics-list
        and local data.
    + advanced/medical_linac
      o Fixed compilation warnings on gcc-7.1.
    + advanced/microbeam
      o PhysicsList, PhysicsListMessenger: removed obsolete way of cut
        definition.
      o DetectorConstruction: thread safe definition of magnetic field.
      o SteppingAction: simplified implementation, added check on alpha
        leaving the world volume.
      o Cleanup and relaxed step size constraints.
    + advanced/nanobeam
      o Added usage of std::floor() in TabulatedField3D.
      o Updated EM field settings for multi-threading;
        changed default.mac macro.
      o Updated handling of UI commands. Code cleanup.
    + advanced/xray_fluorescence
      o Use units for angles explicitly in XrayFluoDetectorConstruction.
    + basic/B3
      o PhysicsList: register EM physics before radioactive-decay.
    + basic/B4
      o Added analysis scripts plotHisto.C and plotNtuple.C.
    + basic/B5
      o Removed use of G4AutoDelete utility for thread-local magnetic-field
        and its manager, since not necessary as now automatically deleted by
        kernel.
      o Use std::array for related data members in B5EventAction to reduce code.
      o Added data members for histogram Ids and the code to retrieve them by
        histogram names via G4AnalysisManager.
      o Corrected the list of 2D histograms in README .
    + extended/biasing/B01
    + extended/biasing/B02
      o Removed unnecessary clearing of sampling.
    + extended/biasing/B03
      o B03PhysicsList: removed obsolete unnececssary instantiation of 
        de-excitation sub-models.
      o Removed unnecessary clearing of sampling.
    + extended/electromagnetic
      o BeginOfRunAction(): disabled storage of random seed.
    + extended/electromagnetic/TestEm0
      o RunAction: updated max energy for CSDARange table.
    + extended/electromagnetic/TestEm5
      o DetectorConstruction: corrected definition of element Chrome.
      o Run: modified normalisation of histogram 1 and 10.
      o PhysicsList: use more uniform builder names.
        Added DNA constructors.
      o Added DNA histograms in HistoManager.
      o Added new flags in StackingAction.
      o Updated pixe.mac macro.
    + extended/electromagnetic/TestEm7
      o Fixed compilation warnings on gcc-7.1.
    + extended/electromagnetic/TestEm12
      o Updated PhysicsList.
    + extended/eventgenerator/HepMC/MCTruth
      o Fixed typo introduced previously.
    + extended/exoticphysics/channeling
      o Added support for G4Crystal.
      o Added support for G4Channeling process.
    + extended/exoticphysics/dmparticle
      o Simplified example for light dark matter (LDM) particles. 
        It consists of LDM Bremsstrahlung process for protons creating
        G4LDMPhotons. The latter decays creating G4LDMHi and G4LDMHiBar LDM
        scalar particles. They can scatter on nucleons and electrons. 
        The first version has electromagnetic processes only.
        Hadron constructors can be added similarly to hadronic examples.
    + extended/exoticphysics/monopole
      o Migrated to multi-threading and g4tools for analysis.
    + extended/exoticphysics/phonon
      o Split build/run/compare test into three: build and run,
        compare timing outputs, compare caustic outputs.
        Added new CMake script ComparePhonon.cmake to perform comparison of
        timing and caustic output/reference files.
      o Updated timing output for MT.
      o Fix in CMake macros to resolve CMP0054 related warnings on Windows.
    + extended/field/field01
      o Fixed Valgrind error in F01FieldSetup::CreateStepperAndChordFinder()
        method; first delete all dependent objects, then create new ones.
    + extended/field/field02
      o Fixed F02ElectricFieldSetup::Update() method. Now all old objects are
        deleted first, and then new ones are created; renamed UpdateStepper()
        to UpdateIntegrator() to clarify its role.
    + extended/field/field03
      o Fixed Valgrind errors in field setup's update method; first delete all
        dependent objects, then create new ones.
    + extended/g3tog4
      o Fixed linking problem for static build.
    + extended/hadronic
      o BeginOfRunAction(): disabled storage of random seed.
    + extended/hadronic/Hadr06
      o Added comments.
    + extended/hadronic/NeutronSource
      o Run: remove normalisation of all histograms.
      o Added comments.
    + extended/medical/DICOM
      o Corrected element definitions for Potassium and Phosphorus in
        DetectorConstruction.
    + extended/medical/dna/chem2
      o Modified time steps.
    + extended/medical/dna/dnaphysics
      o Updated numbering scheme in SteppingAction.
      o Added flag for Capture.
      o Added visualisation to input macro dnaphysics.in.
      o Added new plot in plot.C.
    + extended/medical/dna/icsd
      o New example for Ionisation Cluster Size Distribution. Allows the
        calculation of the distribution concerning the number of ionisations
        per event in an small cylinder of nanometers scale, typical dimensions
        of a 10 base pairs piece of chromatin. First use of new DNA-like
        material's cross-sections experimentally obtained at PTB
        (Rad. Phys and Chem. 130 (2017) 459-479) for electrons and calculated
        for protons on THF, TMP, PY and PU materials.
    + extended/medical/dna/microdosimetry
      o Fixed compilation problem when Qt is enabled.
      o Cleanup and reordering of processes.
    + extended/medical/dna/neuron
      o New example allowing for the modelling of neuron cell irradiation,
        including physical, physico-chemical and chemical processes (e.g.
        production of oxidative radical species in the vicinity of neurons).
        It uses realistic geometrical models of neurons generated from a
        standardized SWC file representing neuron morphology.
    + extended/medical/dna/range
      o Code cleanup.
    + extended/medical/dna/slowing
      o New example showing how to simulate slowing down spectra for electrons
        in liquid water using the Geant4-DNA physics processes and models.
    + extended/medical/dna/spower
      o New example showing how to calculate stopping power of particles 
        in liquid water using the Geant4-DNA physics processes and models.
    + extended/medical/dna/svalue
      o Updated plot.C.
    + extended/medical/dna/wvalue
      o Updated plot.C and wvalue.in macro.
      o Code cleanup.
    + extended/medical/fanoCavity
      o PhysListEmStandard_GS, PhysListEmStandard_SS, PhysListEmStandard_WVI,
        PhysListEmStandard_option3: use the same step function as in
        physics_list factory for corresponding constructors, ensure that step
        function parameters may be redefined by UI commands.
      o Switch to NIST material description (keeping material densities
        defined in previous version).
      o Set default thread number to 2 instead of maximum number of cores.
    + extended/medical/fanoCavity2
      o Switch to NIST material description (keeping material densities
        defined in previous version).
      o Default thread number is not set to the maximum available cores.
    + extended/medical/GammaTherapy
      o Ported to work in multi-threading.
      o Fixed bugs in PrimaryGeneratorAction and RunAction.
    + extended/optical/LXe
      o Fix for issue reported on Hypernews Optical-Photons Forum #651.
    + extended/optical/OpNovice
      o Exercising new DAVIS LUT surface model.
    + extended/optical/wls
      o Fixed compilation warnings on gcc-7.1.
    + extended/parallel/ThreadsafeScorers
      o Fixes to deletion/clearing of static maps between runs.
      o Removed some unnecessary typedefs.
      o Set the number of threads to the number of cores.
    + extended/persistency/persistency/gdml/G01
      o Updated setup for visualization in main program.
      o Added missing gdml files to CMake installation script.
    + extended/persistency/gdml/G02
      o Added commented block in G02DetectorConstruction to show how to limit
        the number of levels in the geometry hierarchy to be exported.
      o Updated setup for visualization in main program.
    + extended/persistency/gdml/G03
      o Updated setup for visualization in main program.
    + extended/Activation
      o New example for survey of the energy deposition and particle's flux
        from a hadronic cascade.
    + extended/radioactivedecay/rdecay01
      o PhysicsList: read new PhotonEvaporation data set; set AugerCascade
        via G4EmParameters; SetStoreAllLevels(true).
        Use time limit from G4IonTable for de-excitation module.
      o TrackingAction: simplified way to get mean-life.
      o Run: added printout of mean time life.
      o BeginOfRunAction(): disabled storage of random seed.
      o Updated user data Cf238.mac and No252.mac, and related README.
      o Fixed format of data file UserRadData_z98.a238.
    + extended/radioactivedecay/rdecay02
      o Updated README, adding a note stating that all histograms but one are
        turned off by default, and describing how to turn them back on.
        Addressing problem report #1936.
    + extended/runAndEvent/RE05
      o Fixed potential rare race condition issue in RE05PrimaryGeneratorAction.
    + extended/visualization/userVisAction
      o Copied exampleB1.in to userVisAction.in.
        Copied run1.mac and run2.mac from example B1.
        All macros now include /run/initialize.
      o Removed init.mac, no longer used.
        /run/initialize is in the new run1.mac and run2.mac.

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