Shape of primary proton spectrum in multi-TeV region from data on vertical muon flux

Details Shape of primary proton spectrum in multi-TeV region from data on vertical muon flux Shape of primary proton spectrum in multi-TeV region from data on vertical muon flux

2008-07-07

arxiv.org/abs/0807.0961v2

Phys.Rev.D78:116001,2008

Astronomy and Astrophysics

Astrophysics

Submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.116001

It is shown, that primary proton spectrum, reconstructed from sea-level and underground data on muon spectrum with the use of QGSJET 01, QGSJET II, NEXUS 3.97 and SIBYLL 2.1 interaction models, demonstrates not only model-dependent intensity, but also model-dependent form. For correct reproduction of muon spectrum shape primary proton flux should have non-constant power index for all considered models, except SIBYLL 2.1, with break at energies around 10-15 TeV and value of exponent before break close to that obtained in ATIC-2 experiment. To validate presence of this break understanding of inclusive spectra behavior in fragmentation region in p-air collisions should be improved, but we show, that it is impossible to do on the basis of the existing experimental data on primary nuclei, atmospheric muon and hadron fluxes.

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