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Shower Profile Reconstruction

Shower Profile Reconstruction. Adelaide/Campinas/Torino. Chicago, 2 October 2002. Basic Steps. determine light collected at the detector per 100 ns time bin F(t) (units 370nm-equivalent photons at diaphragm) determine fluorescence light emitted at the track per grammage interval

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Shower Profile Reconstruction

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  1. Shower Profile Reconstruction Adelaide/Campinas/Torino Chicago, 2 October 2002

  2. Basic Steps • determine light collected at the detector per 100 ns time bin • F(t) (units 370nm-equivalent photons at diaphragm) • determine fluorescence light emitted at the track per grammage interval • L(X) (units of photons in 16 wavelength bins) • requires subtraction of Cherenkov contamination • determine charged particle number per grammage interval • S(X) (longitudinal profile) • Fit Gaisser-Hillas profile with fixed X0=0

  3. E= 2.0 x 1018 eV (4%); Xmax = 704 +/- 10 grams

  4. E= 1.5 x 1019 eV (2%); Xmax = 790 +/- 6 grams

  5. E= 2.6 x 1018 eV (6%); Xmax = 710 +/- 22 grams

  6. log(Nmax) for 20 events

  7. log(E) for 20 events

  8. Xmax for 20 events

  9. Estimated errors Nmax (mean = 3.4%) Xmax (mean 15 grams)

  10. Comparisons with Fick & Sommers

  11. green: usred: F&S lightprofile green: usred: F&S sizeprofile

  12. green: usred: F&S lightprofile green: usred: F&S sizeprofile

  13. green: usred: F&S lightprofile green: usred: F&S sizeprofile

  14. Comparing Nmax Nmaxus-NmaxFS Nmaxus

  15. Comparing Xmax Xmaxus-XmaxFS

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