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High energy cosmic ray physics with underground muons in MACRO. II. Primary spectra and composition
Journal article   Open access

High energy cosmic ray physics with underground muons in MACRO. II. Primary spectra and composition

R. Bellotti, F. Cafagna, M. Calicchio, M. Castellano, G. De Cataldo, C. De Marzo, O. Erriquez, C. Favuzzi, P. Fusco, N. Giglietto, …
Physical Review, D, v 56(3)
01 Aug 1997
DOI: https://doi.org/10.1103/PhysRevD.56.1418
url
http://hdl.handle.net/11568/53563View
Published, Version of Record (VoR)Open Access (License Unspecified),  Open
url
https://doi.org/10.1103/PhysRevD.56.1418View
Published, Version of Record (VoR) Open

Abstract

COSMIC RAY FLUX ENERGY SPECTRA ERRORS MASS MULTIPLICITY MUONS Physics
Multimuon data from the MACRO experiment at Gran Sasso have been analyzed using a new method, which allows one to estimate the primary cosmic ray fluxes. The estimated all-particle spectrum is higher and flatter than the one obtained from direct measurements but is consistent with EAS array measurements. The spectral indexes of the fitted energy spectrum are 2.56{plus_minus}0.05 for E{lt}500 TeV and 2.9{plus_minus}0.3 for E{gt}5000 TeV with a gradual change at intermediate energies. The average mass number shows little dependence on the primary energy below 1000 TeV, with a value of 10.1{plus_minus}2.5 at 100 TeV. At higher energies the best fit average mass shows a mild increase with energy, even though no definite conclusion can be reached taking into account errors. The fitted spectra cover a range from {approximately} 50 TeV up to several thousand TeV. {copyright} {ital 1997} {ital The American Physical Society}

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Astronomy & Astrophysics
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