CORSIKA bug and other updates

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CORSIKA bug and other updates

• Dmitry Chirkin

UC Berkeley
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CORSIKA updates

• Track times are given relative to the shower core
  arrival to the surface
• F2k and related fixes track numbers and parent
  ids (treated by ucr), p-gtZ1
• All coordinates are given at the observation
  level (ice surface), track length now exact
• Shower times can now be assigned and coincident
  showers can be treated (by combining them within
  a predefined time window)

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CORSIKA bug

• CORSIKA version 6.023 and earlier had muon
  radiative energy losses underestimated by 103. As
  of version 6.030 this is corrected. Effect on the
  background calculation is minor.

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Nch distributions

• To estimate the differences between different
  CORSIKA versions and CR spectrum models, and
  effect of the coincident showers on the
  background simulation, Nch distributions are
  compared.

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Spectrum index corrections
1st method
2nd method

• results

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CORSIKA updates (continued)

• Possible to choose between Wiebel-Sooth and Jorg
  Horandel published primary spectra. The latter is
  implemented within the poli-gonato model of the
  CR energy spectrum. This implementation is now
  valid up to 50 PeV

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Poli-gonato CR spectrum fits

• From J-H

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Conclusions

• Many updates to CORSIKA were implemented
• CORSIKA bug is corrected in current version
  (6.030) and has no effect on the background muon
  simulation
• Coincident shower events do not significantly
  affect the background simulation
• Change from Wiebel-Sooth CR spectra to the Jorg
  Horandel poli-gonato model does affect the
  background simulation, the change in spectral
  index is of the order 0.02

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Auxiliary slides

• Spectrum correction depth profiles

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Spectrum corrections method
1st method
2nd method

• Also my spectrum corrections method was applied