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Neutrino Scattering In Geant4

Neutrino Scattering In Geant4. Geant4 Collaboration Meeting 27 September 2017 Dennis Wright (SLAC). Progress So Far. First step: Geant4-to-GENIE interface use Geant4 Bertini cascade to do final state interactions in nucleus after GENIE neutrino vertex is generated

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Neutrino Scattering In Geant4

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  1. Neutrino Scattering In Geant4 Geant4 Collaboration Meeting 27 September 2017 Dennis Wright (SLAC)

  2. Progress So Far • First step: Geant4-to-GENIE interface • use Geant4 Bertini cascade to do final state interactions in nucleus after GENIE neutrino vertex is generated • complete, committed to GENIE svn • validation underway • Early results: • no final state nuclear interaction model (red) • HAIntranuke (GENIE) final state interaction model • Bertini cascade (Geant4) final state model

  3. Neutrino Scattering: NCEL (black:Bertini, blue: GENIE)

  4. Neutrino Scattering: DIS (black:Bertini, Blue: GENIE)

  5. Next Steps • GENIE-to-Geant4 • use GENIE neutrino generators to initiate neutrino interactions in Geant4 • need wrapper code which calls GENIE to generate neutrino vertex and converts GENIE secondaries to Geant4 particle types • pass these secondaries to a Geant4 hadronic code to perform final state interactions within nucleus • will use Bertini to start, but could be others • will need to extract, build and maintain minimal GENIE libraries on Geant4 side • Dennis

  6. Next Steps • Geant4 neutrino classes • some native Geant4 neutrino cross section classes already exist (V. Grichine) • need elastic and inelastic processes • coherent elastic does not exist in GENIE • problem: no one-to-one correspondence between Geant4 neutrino processes and GENIE processes • elastic, quasi-elastic processes in GENIE refer to neutrino-nucleon collision and not neutrino-nuclear as in Geant4 • do we follow GENIE philosophy by treating neutrino reaction types separately (NCEL, CCQE, DIS, …) or lump these all together as one inelastic Geant4 process?

  7. Next Steps • Biasing • GENIE takes care of very small interaction cross sections by a detailed scan of the detector geometry • maximum neutrino cross section in that scan used to set sampling scale • interaction point in detector chosen based on scan • In Geant4 attempt to track neutrinos like any other particle  no initial scan of detector • therefore must do track biasing • can use recently added Geant4 biasing techniques to do this • events can then be run in natural Geant4 way 7

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