low-energy interaction models in corsika dieter heck, ralph engel forschungszentrum karlsruhe,...
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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
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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
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Comparison to low-energy p-Be data (1)
R. Engel, ICRC 2003, Tsukuba, Japan
double-differential data integrated PLB
472 (2000) 113
uncertainties: inter- and extrapolation
GHEISHA: multiplicity too low
QGSJET: multiplicity too high
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Comparison to low-energy p-Be data (2)
R. Engel, ICRC 2003, Tsukuba, Japan
double-differential data integrated PLB
472 (2000) 113
uncertainties: inter- and extrapolation
very limited amount of data available
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Comparison to low-energy p-C data
R. Engel, ICRC 2003, Tsukuba, Japan
fully inclusive measurements
positive pions difficult to measure
energy below Feynman scaling region
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Cross-check: p-N predictions
R. Engel, ICRC 2003, Tsukuba, Japan
predictions similar to p-Be and p-C
QGSJET: higher multiplicity than FLUKA
GHEISHA: lower multiplicity than FLUKA
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R. Engel, ICRC 2003, Tsukuba, Japan
example: multiplicity of p-p interactions
default transition energy: Elab = 80 GeV
similar results for charged kaons
Transition: low- and high energy models
80 GeV
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R. Engel, ICRC 2003, Tsukuba, Japan
vertical proton induced showers
significant change in baryon energy spectrum
strong model dependence of lateral distribution
EAS predictions: baryon distributions
R. Engel, ICRC 2003, Tsukuba, Japan
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vertical proton- induced showers
very small changes in longitudinal profile
differences of same order as statistical fluctuations
EAS predictions: longitudinal shower profile
R. Engel, ICRC 2003, Tsukuba, Japan
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R. Engel, ICRC 2003, Tsukuba,
QGSJET: dependence on low-energy model and threshold
SIBYLL: dependence on threshold
difference between QGSJET and SIBYLL bigger than low-energy model dependence
EAS predictions: muon energy spectrum
R. Engel, ICRC 2003, Tsukuba, Japan
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R. Engel, ICRC 2003, Tsukuba, Japan
vertical proton showers
partial cancellation of low-energy model dependence
differences between high-energy models dominate
R. Engel, ICRC 2003, Tsukuba, Japan
Integral muon energy spectrum
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R. Engel, ICRC 2003, Tsukuba, Japan
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
EAS predictions: muon lateral distribution
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R. Engel, ICRC 2003, Tsukuba, Japan
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
EAS predictions at Auger energies
R. Engel, ICRC 2003, Tsukuba, Japan
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R. Engel, ICRC 2003, Tsukuba, Japan
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
EAS predictions at Auger energies
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R. Engel, ICRC 2003, Tsukuba, JapaR. Engel, ICRC 2003, Tsukuba, Japan
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
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R. Engel, ICRC 2003, Tsukuba, JapaR. Engel, ICRC 2003, Tsukuba, Japan
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)
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R. Engel, ICRC 2003, Tsukuba, JapaR. Engel, ICRC 2003, Tsukuba, Japan
Kaon multiplicity in p-p interactions
GHEISHA: multiplicity too low
SIBYLL and neXus similar
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R. Engel, ICRC 2003, Tsukuba, JapaR. Engel, ICRC 2003, Tsukuba, Japan
GHEISHA: differences at large lateral distances
lateral distributions almost threshold independent
Pion and muon lateral distribution
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R. Engel, ICRC 2003, Tsukuba, JapaR. Engel, ICRC 2003, Tsukuba, Japan
dependence on low-energy model small
differences comparable to statistical error
Lateral distribution of electrons
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R. Engel, ICRC 2003, Tsukuba, JapaR. Engel, ICRC 2003, Tsukuba, Japan
strong dependence on model
strong dependence on threshold
Lateral distribution of neutrons