Study of the Ultrahigh-energy Primary-cosmic-ray Composition With the Macro Experiment
- S. AHLEN
- M. AMBROSIO
- R. ANTOLINI
- A. BALDINI
- B. B. BAM
- G. C. BARBARINO
- B. C. BARISH
- G. BATTISTONI
- R. BELLOTTI
- C. BEMPORAD
- P. BERNARDINI
- H. BILOKON
- V. BISI
- C. BLOISE
- S. BUSSINO
- F. CAFAGNA
- M. CALICCHIO
- P. CAMPANA
- D. CAMPANA
- M. CARBONI
- S. CECCHINI
- F. CEI
- V. CHIARELLA
- C. CHIERA
- A. COBIS
- R. CORMACK
- A. CORONA
- S. COUTU
- G. DECATALDO
- C. DEMARZO
- M. DEVINCENZI
- A. DICREDICO
- E. DIEHL
- O. ERRIQUEZ
- C. FAVUZZI
- D. FICENEC
- C. FORTI
- L. FOTI
- P. FUSCO
- G. GIACOMELLI
- G. GIANNINI
- N. GIGLIETTO
- P. GIUBELLINO
- M. GRASSI
- P. GREEN
- A. GRILLO
- F. GUARINO
- C. GUSTAVINO
- A. HABIG
- R. HEINZ
- J. T. HONG
- E. IAROCCI
- E. KATSAVOUNIDIS
- E. KEARNS
- S. KLEIN
- S. KYRIAZOPOULOU
- E. LAMANNA
- C. LANE
- C. LEE
- D. LEVIN
- P. LIPARI
- G. LIU
- R. LIU
- M. J. LONGO
- G. LUDLAM
- G. MANCARELLA
- G. MANDRIOLI
- A. MARGIOTTANERI
- A. MARIN
- A. MARINI
- D. MARTELLO
- G. MARTELLOTTI
- A. M. CHIESA
- M. MASERA
- P. MATTEUZZI
- D. G. MICHAEL
- L. MILLER
- P. MONACELLI
- M. MONTENO
- S. MUFSON
- J. MUSSER
- S. NUTTER
- C. OKADA
- G. OSTERIA
- O. PALAMARA
- S. PARLATI
- V. PATERA
- L. PATRIZII
- R. PAZZI
- C. W. PECK
- J. PETRAKIS
- S. PETRERA
- N. D. PIGNATANO
- P. PISTILLI
- F. PREDIERI
- L. RAMELLO
- J. REYNOLDSON
- F. RONGA
- G. ROSA
- L. SATTA
- E. SCAPPARONE
- K. SCHOLBERG
- A. SCIUBBA
- P. S. LUGARESI
- M. SEVERI
- M. SITTA
- P. SPINELLI
- M. SPINETTI
- M. SPURIO
- J. STEELE
- R. STEINBERG
- J. L. STONE
- L. R. SULAK
- A. SURDO
- G. TARLE
- V. TOGO
- V. VALENTE
- G. R. VERDONE
- C. W. WALTER
- R. WEBB
- W. WORSTELL
- AURIEMMA, Giulio
- SATRIANO, Celestina
DOIAbstract
We present the analysis of multiple-muon events collected with one supermodule (1013 h live time) and two supermodules (1195 h live time) of the MACRO detector at Gran Sasso, Italy. Multimuon rates are shown to be sensitive to primary-cosmic-ray energies between approximately 50 TeV and several thousand TeV. Experimental data are compared with the expected rates from two composition models: a light (i.e., proton-rich) and a heavy (i.e., Fe-rich) composition. The predictions are based on a Monte Carlo simulation of the hadronic interactions of cosmic-ray nuclei, followed by a detailed tracking of the muons through the rock and the experimental apparatus. The results show good sensitivity of the MACRO detector to primary composition. The data...
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