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CORSIKA bug and other updates

CORSIKA bug and other updates. Dmitry Chirkin. UC Berkeley. 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->Z1

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CORSIKA bug and other updates

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  1. CORSIKA bug and other updates Dmitry Chirkin UC Berkeley

  2. 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->Z1 • 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)

  3. 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.

  4. 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.

  5. Spectrum index corrections 1st method • results 2nd method

  6. 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

  7. Poli-gonato CR spectrum fits • From J-H

  8. 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

  9. Auxiliary slides • Spectrum correction depth profiles

  10. Spectrum corrections method 1st method • Also my spectrum corrections method was applied 2nd method

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