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


Journal Article

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[Formula presented]0.05 for [Formula presented]500 TeV and 2.9[Formula presented]0.3 for [Formula presented]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[Formula presented]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 [Formula presented] 50 TeV up to several thousand TeV. © 1997 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Ambrosio, M; Antolini, R; Auriemma, G; Baker, R; Baldini, A; Barbarino, GC; Barish, BC; Battistoni, G; Bellotti, R; Bemporad, C; Bernardini, P; Bilokon, H; Bisi, V; Bloise, C; Bosio, T; Bower, C; Bussino, S; Cafagna, F; Calicchio, M; Campana, D; Carboni, M; Castellano, M; Cecchini, S; Cei, F; Chiarella, V; Corona, A; Coutu, S; De Cataldo, G; Dekhissi, H; De Marzo, C; De Mitri, I; De Vincenzi, M; Di Credico, A; Erriquez, O; Fantini, R; Favuzzi, C; Forti, C; Fusco, P; Giacomelli, G; Giannini, G; Giglietto, N; Goretti, M; Grassi, M; Grillo, A; Guarino, F; Guarnaccia, P; Gustavino, C; Habig, A; Hanson, K; Hawthorne, A; Heinz, R; Hong, JT; Iarocci, E; Katsavounidis, E; Kearns, E; Kyriazopoulou, S; Lamanna, E; Lane, C; Levin, DS; Lipari, P; Longley, NP; Longo, MJ; Mancarella, G; Mandrioli, G; Margiotta-Neri, A; Marini, A; Martello, D; Marzari-Chiesa, A; Mazziotta, MN; Michael, DG; Mikheyev, S; Miller, L; Monacelli, P; Montaruli, T; Monteno, M; Mufson, S; Musser, J; Nicoló, D; Nolty, R; Okada, C; Orth, C; Osteria, G; Palamara, O; Parlati, S; Patera, V; Patrizii, L; Pazzi, R; Peck, CW; Petrera, S; Pistilli, P; Popa, V; Rainó, A; Reynoldson, J; Ricciardi, M; Ronga, F; Rubizzo, U; Sanzgiri, A; Sartogo, F; Satriano, C

Published Date

  • January 1, 1997

Published In

Volume / Issue

  • 56 / 3

Start / End Page

  • 1418 - 1436

Electronic International Standard Serial Number (EISSN)

  • 1550-2368

International Standard Serial Number (ISSN)

  • 1550-7998

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.56.1418

Citation Source

  • Scopus