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.
High energy cosmic ray physics with underground muons in MACRO. PartII. Primary spectra and composition / Barbarino, Giancarlo; Guarino, Fausto. - In: PHYSICAL REVIEW D. - ISSN 0556-2821. - STAMPA. - 56:(1997), pp. 1418-1436. [10.1103/PhysRevD.56.1418]
High energy cosmic ray physics with underground muons in MACRO. PartII. Primary spectra and composition
BARBARINO, GIANCARLO;GUARINO, FAUSTO
1997
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.