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

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

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvd..56.1418a&link_type=abstract

Physical Review D (Particles and Fields), Volume 56, Issue 3, 1 August 1997, pp.1418-1436

Physics

20

Cosmic-Ray Interactions, Cosmic Rays

Scientific paper

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+/-0.05 for E<500 TeV and 2.9+/-0.3 for E>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+/-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 ~ 50 TeV up to several thousand TeV.

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