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Low-Energy Interaction Models in CORSIKA

Low-Energy Interaction Models in CORSIKA. Dieter Heck, Ralph Engel. Forschungszentrum Karlsruhe, Germany. Giuseppe Battistoni, Alberto Fass ò, Alfredo Ferrari, Johannes Ranft, and Paola R. Sala. ICRC 2003, Tsukuba, Japan. Motivation and Outline.

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Low-Energy Interaction Models in CORSIKA

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  1. Low-Energy Interaction Models in CORSIKA Dieter Heck, Ralph Engel Forschungszentrum Karlsruhe, Germany Giuseppe Battistoni, Alberto Fassò, Alfredo Ferrari, Johannes Ranft, and Paola R. Sala ICRC 2003, Tsukuba, Japan

  2. Motivation and Outline shower observables sensitive to both low- and high-energy hadronic interactions FLUKA 2002 as alternative hadronic interaction model implemented new correction patches available for GHEISHA (R.E. Cassell and G. Bower, SLAC) comparison of model predictions to low-energy data calculation of influence on EAS predictions R. Engel, ICRC 2003, Tsukuba, Japan

  3. Comparison to low-energy p-Be data (1) double-differential data integratedPLB 472 (2000) 113 uncertainties: inter- and extrapolation GHEISHA: multiplicity too low QGSJET: multiplicity too high R. Engel, ICRC 2003, Tsukuba, Japan

  4. Comparison to low-energy p-Be data (2) double-differential data integratedPLB 472 (2000) 113 uncertainties: inter- and extrapolation very limited amount of data available R. Engel, ICRC 2003, Tsukuba, Japan

  5. Comparison to low-energy p-C data fully inclusive measurements positive pions difficult to measure energy below Feynman scaling region R. Engel, ICRC 2003, Tsukuba, Japan

  6. Cross-check: p-N predictions predictions similar to p-Be and p-C QGSJET: higher multiplicity than FLUKA GHEISHA: lower multiplicity than FLUKA R. Engel, ICRC 2003, Tsukuba, Japan

  7. Transition: low- and high energy models example: multiplicity of p-p interactions default transition energy: Elab = 80 GeV similar results for charged kaons 80 GeV R. Engel, ICRC 2003, Tsukuba, Japan

  8. EAS predictions: baryon distributions vertical proton induced showers significant change in baryon energy spectrum strong model dependence of lateral distribution R. Engel, ICRC 2003, Tsukuba, Japan R. Engel, ICRC 2003, Tsukuba, Japan

  9. EAS predictions: longitudinal shower profile vertical proton- induced showers very small changes in longitudinal profile differences of same order as statistical fluctuations R. Engel, ICRC 2003, Tsukuba, Japan

  10. EAS predictions: muon energy spectrum QGSJET: dependence on low-energy model and threshold SIBYLL: dependence on threshold difference between QGSJET and SIBYLL bigger than low-energy model dependence R. Engel, ICRC 2003, Tsukuba, R. Engel, ICRC 2003, Tsukuba, Japan

  11. Integral muon energy spectrum vertical proton showers partial cancellation of low-energy model dependence differences between high-energy models dominate R. Engel, ICRC 2003, Tsukuba, Japan R. Engel, ICRC 2003, Tsukuba, Japan

  12. EAS predictions: muon lateral distribution vertical proton- induced showers Eµ > 300 MeV changes at small and large lateral distances changes compatible with energy spectra R. Engel, ICRC 2003, Tsukuba, Japan R. Engel, ICRC 2003, Tsukuba, Japan

  13. EAS predictions at Auger energies vertical proton showers, E= 1019 eV Eµ > 150 MeV Ee > 250 keV drastic changes at large lateral distance see also talk by H.J. Drescher R. Engel, ICRC 2003, Tsukuba, Japan R. Engel, ICRC 2003, Tsukuba, Japan

  14. EAS predictions at Auger energies vertical proton showers, E= 1019 eV Eµ > 150 MeV Ee > 250 keV drastic changes at large lateral distance see also talk by H.J. Drescher R. Engel, ICRC 2003, Tsukuba, Japan R. Engel, ICRC 2003, Tsukuba, Japan

  15. Summary and outlook significant differences between low-energy models FLUKA gives best description of low-energy data strong effect on hadronic distributions no effect on longitudinal shower profiles muonic observables sensitive to low-energy model: change of muon energy spectrum cancellation: small change of total muon number drastic change of lateral distributions at high energy R. Engel, ICRC 2003, Tsukuba, Japa R. Engel, ICRC 2003, Tsukuba, Japan

  16. References D. Heck et al., Report FZKA 6019 (1998), Forschungszentrum Karlsruhe;http://www-ik.fzk.de/ A. Fassò, A. Ferrari, J. Ranft, P.R. Sala: FLUKA: Status and Prospective of Hadronic Applications, Proc. Monte Carlo 2000 Conf., Lisbon, Oct. 23-26, 2000, A. Kling et al. eds., Springer (Berlin) 955 (2001);http://www.fluka.org/ H. Fesefeldt, Report PITHA-85/02 (1985), RWTH Aachen R.E. Cassell and G. Bower (SLAC), private communication (2002) R. Engel, ICRC 2003, Tsukuba, Japa R. Engel, ICRC 2003, Tsukuba, Japan

  17. Kaon multiplicity in p-p interactions GHEISHA: multiplicity too low SIBYLL and neXus similar R. Engel, ICRC 2003, Tsukuba, Japa R. Engel, ICRC 2003, Tsukuba, Japan

  18. Pion and muon lateral distribution GHEISHA: differences at large lateral distances lateral distributions almost threshold independent R. Engel, ICRC 2003, Tsukuba, Japa R. Engel, ICRC 2003, Tsukuba, Japan

  19. Lateral distribution of electrons dependence on low-energy model small differences comparable to statistical error R. Engel, ICRC 2003, Tsukuba, Japa R. Engel, ICRC 2003, Tsukuba, Japan

  20. Lateral distribution of neutrons strong dependence on model strong dependence on threshold R. Engel, ICRC 2003, Tsukuba, Japa R. Engel, ICRC 2003, Tsukuba, Japan

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