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

  • M. Ambrosio
  • , R. Antolini
  • , G. Auriemma
  • , R. Baker
  • , A. Baldini
  • , G. C. Barbarino
  • , B. C. Barish
  • , G. Battistoni
  • , R. Bellotti
  • , C. Bemporad
  • , P. Bernardini
  • , H. Bilokon
  • , V. Bisi
  • , C. Bloise
  • , T. Bosio
  • , C. Bower
  • , S. Bussino
  • , F. Cafagna
  • , M. Calicchio
  • , D. Campana
  • M. Carboni, M. Castellano, S. Cecchini, F. Cei, V. Chiarella, A. Corona, S. Coutu, G. De Cataldo, H. Dekhissi, C. De Marzo, I. De Mitri, M. De Vincenzi, A. Di Credico, O. Erriquez, R. Fantini, C. Favuzzi, C. Forti, P. Fusco, G. Giacomelli, G. Giannini, N. Giglietto, M. Goretti, M. Grassi, A. Grillo, F. Guarino, P. Guarnaccia, C. Gustavino, A. Habig, K. Hanson, A. Hawthorne, R. Heinz, J. T. Hong, E. Iarocci, E. Katsavounidis, E. Kearns, S. Kyriazopoulou, E. Lamanna, C. Lane, D. S. Levin, P. Lipari, N. P. Longley, M. J. Longo, G. Mancarella, G. Mandrioli, A. Margiotta-Neri, A. Marini, D. Martello, A. Marzari-Chiesa, M. N. Mazziotta, D. G. Michael, S. Mikheyev, L. Miller, P. Monacelli, T. Montaruli, M. Monteno, S. Mufson, J. Musser, D. Nicoló, R. Nolty, C. Okada, C. Orth, G. Osteria, O. Palamara, S. Parlati, V. Patera, L. Patrizii, R. Pazzi, C. W. Peck, S. Petrera, P. Pistilli, V. Popa, A. Rainó, J. Reynoldson, M. Ricciardi, F. Ronga, U. Rubizzo, A. Sanzgiri, F. Sartogo, C. Satriano, L. Satta, E. Scapparone, K. Scholberg, A. Sciubba, P. Serra-Lugaresi, M. Severi, M. Sitta, P. Spinelli, M. Spinetti, M. Spurio, R. Steinberg, J. L. Stone, L. R. Sulak, A. Surdo, G. Tarlé, V. Togo, V. Valente, C. W. Walter, R. Webb

Research output: Contribution to journalArticlepeer-review

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[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.

Original languageEnglish
Pages (from-to)1418-1436
Number of pages19
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume56
Issue number3
DOIs
Publication statusPublished - 1997
Externally publishedYes

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