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 similar to 50 TeV up to several thousand TeV.

HIGH ENERGY COSMIC RAY PHYSICS WITH THE MACRO DETECTOR AT GRAN SASSO: PART II. PRIMARY SPECTRA AND COMPOSITION

CEI, FABRIZIO;NICOLO', DONATO;
1997-01-01

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 similar to 50 TeV up to several thousand TeV.
1997
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, Fabrizio; 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; Nicolo', Donato; 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; Satta, L; Scapparone, E; Scholberg, K; Sciubba, A; Serra Lugaresi, P; Severi, M; Sitta, M; Spinelli, P; Spinetti, M; Spurio, M; Steinberg, R; Stone, Jl; Sulak, Lr; Surdo, A; Tarlé, G; Togo, V; Valente, V; Walter, Cw; Webb, R.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/53563
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