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Simple benchmarks Final remarks on pion absorption

This project outlines the simulation and experimental validation of pion absorption across various materials (Al, Cu, Au). It highlights the general setup, validation/comparison plots, and conclusions drawn from a thin target experiment designed to study individual pion-nucleus processes. Both Geant4 (G4) and Fluka simulations are assessed for their ability to reproduce experimental data, with some instances showing Fluka to be more accurate. Challenges from uncertainties in experimental data complicate conclusions, yet reasonable agreement between simulations and data is observed.

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Simple benchmarks Final remarks on pion absorption

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  1. Simple benchmarks Final remarks on pion absorption Witek Pokorski Simulation Project

  2. Outline • short reminder on the setup • validation/comparison plots • conclusion Simulation Project

  3. Pion absorption benchmark • (see talk given on 3rd of March 2004 at the Physics Validation meeting) • general idea: thin target (Al,Cu,Au) experiment to study individual pion-nucleus process • experimental data • K. Nakai at al., PRL 44, 1446 (1980) • D. Ashery et al, PR C23, 2173 (1991) • simulation • G4 setup initially developed by Isidro Gonzalez (Alice) • ‘fake’ thin target experiment – large block of material, tracking stopped as soon as a process occurs • using QGSP_BERT physics list • Fluka ‘bypass’ provided by Alfredo Ferrari • using the new parametrisation based on the internal Fluka model Simulation Project

  4. Total inelastic cross section Simulation Project

  5. G4: Au cross section table corrected G4.6.1 G4.6.2 G4.6.2 G4.6.1 Simulation Project

  6. Absorptive part for pi+ Simulation Project

  7. Absorption Xsection for pi+ • both G4 and Fluka show reasonable agreement • in some cases Fluka seems to be a bit better • difficult to make more conclusions because of big uncertainties in the experimental data Simulation Project

  8. Absorptive part for pi- Simulation Project

  9. Absorption Xsection for pi- • same remarks as for pi+ • for heavy material (Au) the shape of the QGSP_BERT quite different (?) • G4: best agreement for ‘medium-weight’ materials Simulation Project

  10. Particle spectra for pi+ on Al Simulation Project

  11. Particle spectra for pi+ on Cu Simulation Project

  12. Particle spectra for pi+ on Au Simulation Project

  13. Particle spectra for pi- on Al Simulation Project

  14. Particle spectra for pi- on Cu Simulation Project

  15. Particle spectra for pi- on Au Simulation Project

  16. Summary • Both Geant4 and Fluka results show reasonable agreement between simulation and experimental data • In some cases Fluka seems to be a bit better than G4 with QGSP_BERT, but hard to judge because of big uncertainties in the experimental data • BUT: how well do we need to reproduce that data???? • bug corrected in G4 cross section tables • additional motivation for Fluka to move to the new parametrisation • LCG note on pion absorption benchmark in preparation Simulation Project

  17. Fluka parametrisations (1/2) Simulation Project

  18. Fluka parametrisation (2/2) Simulation Project

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