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Analysis of Proton Interaction Length in Carbon: A Study by A. Murakami

This study investigates the interaction length of protons in carbon, focusing on parameters such as flux normalization and constant variations. Data from Super-Kamiokande (SK) and ND5 detectors indicate minimal differences in normalized flux ratios across varying energy levels (0-2 GeV). The findings confirm previous research by Nicolas, highlighting negligible discrepancies between out-target and total interactions. Simulations utilize Geant3 and other tools, examining the impact of beam profiles and secondary interactions involving horn aluminum. Results provide insights into proton behavior in neutron beam environments.

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Analysis of Proton Interaction Length in Carbon: A Study by A. Murakami

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  1. Interaction Length A. Murakami

  2. L = 38.83 (interaction length of proton in carbon by PDG) • change of constant : means uncertainty of L (change 0.8, 0.9, 1.0, 1.1, 1.2) • Flux is normalized at peak flux.

  3. Normalized Flux @SK Flux × 30 for looking at the tail There seems to be no difference... Flux × 15 for looking at the tail

  4. Ratio of Normalized Flux @SK constant = 1.1, 1.2 vs 1.0 zoom to 0~2 GeV Diff. less than 3% Diff. less than 5%

  5. Ratio of Normalized Flux @SK constant = 0.9, 0.8 vs 1.0 zoom around 0~2 GeV Diff. less than 3% Diff. more than 5%

  6. Ratio of Normalized Flux @ND5 constant = 1.2, 1.1 vs 1.0 zoom around 0~2 GeV Diff. less than 2% Diff. less than 3%

  7. Ratio of Normalized Flux @ND5 constant = 0.9, 0.8 vs 1.0 zoom around 0~2 GeV Diff. less than 2% Diff. less than 5%

  8. Far / Near constant=1.0, 1.1, 1.2 zoom around 0~2 GeV There seems to be no difference...

  9. Far / Near constant=1.0, 0.9, 0.8 zoom around 0~2 GeV There seems to be no difference...

  10. Comparison of Far/Near constant=1.0, 1.1, 1.2 zoom around 0~2 GeV Diff less than 2% Diff less than 3%

  11. Comparison of Far/Near constant=1.0, 0.9, 0.8 zoom around 0~2 GeV Diff less than 2% Diff less than 4%

  12. Out-target/In-target comparison Murakami Confirmation of Nicolas’s study

  13. Zoom

  14. Zoom

  15. Zoom

  16. Zoom Diff between “out” and “total”< 6%

  17. Primary beam profile A. Murakami

  18. Black : nominal beam profile Blue : Flat beam Red : pencil beam Y-Scale × 40

  19. ZOOM 20

  20. ZOOM 21

  21. ZOOM 22

  22. ZOOM 23

  23. Z binning studybinning target exit z position A. Murakami

  24. Normal use for model comparison 30GeV proton In jnubeam Vector information Simple simulation by either geant3, mars, fluka, geant4 …… Target is just a 90cm, 2.6cm-diameter rod. Vector information of particles just exit the target is output. Generate and trace the track inputted. This study 30GeV proton In jnubeam Vector information ‘one bin’ case Simple simulation by geant3 Target is just a 90cm, 2.6cm-diameter rod. Vector information of particles just exit the target is output. But ‘z’ value is modified to simulate the binning condition. Generate and trace the track input. 25

  25. 27

  26. 28

  27. ZOOM 29

  28. ZOOM 30

  29. Secondary interaction in Horn Aluminum A. Murakami

  30. Red: remove horn aluminum Black : nominal Super-K ND off-axis

  31. 33

  32. 34

  33. 35

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  35. Upper number: 0.4<En<1.2GeV region Lower number : En<10GeV Primary interaction Secondary Interaction

  36. Upper number: 0.4<En<1.2GeV region Lower number : En<10GeV Cont’d Primary Beam Horn

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