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Hadronic Improvements for Release 9.5

Dennis Wright Geant4 Technical Forum 8 November 2011. Hadronic Improvements for Release 9.5. Outline. Fritiof (FTF) model Precompound/de-excitation New neutron models Improved muon-nuclear Radioactive decay Energy/momentum checking Cross section re-design G4Exception migration

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Hadronic Improvements for Release 9.5

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  1. Dennis Wright Geant4 Technical Forum 8 November 2011 Hadronic Improvementsfor Release 9.5

  2. Outline • Fritiof (FTF) model • Precompound/de-excitation • New neutron models • Improved muon-nuclear • Radioactive decay • Energy/momentum checking • Cross section re-design • G4Exception migration • Physics lists 2

  3. Fritiof Parton/String (FTF) Model • Anti-ion-nuclear interactions now included • antideuteron, antitriton, anti3He, antialpha down to zero incident energy • Antibaryon-nuclear interactions now included • strange and non-strange antibaryons down to zero KE • New antiproton stopping model • uses above feature of FTF 3

  4. Precompound/De-excitation • Photo-evaporation • in place of existing evaporation data file, user can now substitute his own (as argument in physics list) 4

  5. Neutron Models • ENDL/GIDI • new ENDL high precision neutron models developed to use new data format developed by LLNL • ENDL99 and ENDF-VII.0 have been converted to new data format and are distributed from LLNL website • HP Neutron Models and G4NDL • G4NDL 3.16 fully migrated to ENDF-VII.0 • 389 isotopes + 3 natural abundances and 9 excited isomer states • Thermal scattering files migrated to ENDF/B-VII format • now possible to clearly identify which db is being used for which reaction • CIEMAT translation of 8 data libraries including ENDF-6, ENDF-7, JENDL, JEFF, BROND, CENDL, … • existing NeutronHP model extended to read these, as well as original HP libraries • will be distributed from IAEA web site 5

  6. Improved Muon-nuclear Model • G4VDMuonNuclearModel • uses Kokoulin virtual photon spectrum • converts photon to pi+ or pi- then uses Bertini cascade to interact pion (instead of LHEP) • Precursor to replacement of electronuclear and photonuclear models 6

  7. Radioactive Decay • Forbidden beta decay added • 1st, 2nd, 3rd unique and 1st non-unique • new data files, in RadioactiveDecay3.4, to be released with corresponding forbidden decay flags • Improved photo-evaporation database for gamma emission following internal conversion • also bug in calculation of internal conversion coefficients fixed • better reproduction of gamma line intensity • Now can handle Z > 100 • users can develop their own heavy nuclei and set flag to allow their use 7

  8. Energy/Momentum Checking • Almost all in-flight hadronic processes now have automatic energy and momentum checking • most models conserve to within 1 MeV • environment variables available to change allowed level of non-conservation • not yet applied to stopping models, CHIPS • E/p checking now part of routine testing 8

  9. Cross Section Re-design • Neededinorderto: • treat materials which include isomers in composition • allow thermal scattering in NeutronHP to automatically handle G4NistMaterials • avoid multiple copies of cross section data/calculations • Newmethodsandrefactoring • no change in physics performance expected or observed • possible slight slowdown due to more complex design 9

  10. G4Exception Migration • All hadronic processes, models and cross sections now use new G4Exception • error code convention: HAD_XXXX_NNNN, where • XXXX = process, model, or cross section abbreviation • NNNN = error number within method (not a severity code any longer) • Expect more uniform error reporting as a result 10

  11. Physics Lists • Supported lists are required to be stable and their component models well-maintained • When possible, replace weaker models or cross sections by stronger ones • based on validation results • reduce use of parameterized models (LEP, HEP) • CPU usage always considered • FTFP_BERT is a fully supported physics list • integrates recent improvements in FTF (including anti-baryons and anti-ions as projectiles) • essentially free of parameterized models • Starting to reduce physics list dependence on some components of CHIPS • stability in physics lists used by LHC a driving issue here 11

  12. Physics Lists • Status change for several physics lists • Formerly supported: QGSP_BERT –> experimental QGSP_BERT_EMV – replaced by physics list factory CHIPS -> experimental • Formerly experimental: FTFP_BERT_EMX – replaced by physics list factory FTF_BIC – use FTF for kaons QGSP_BERT_EMX – replaced by physics list factory QGSP_BERT_NOLEP –> unsupported QGSP_BERT_TRV –> unsupported Shielding -> supported 12

  13. Physics Lists • Status change for several physics lists • Replaced: QGSP – functionality replaced by other physics lists, currently no usable • Status undecided: LBE -> experimental or unsupported QBBC -> experiemtnal? 13

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