Summary
Electromagnetic interactions (excluding nuclear interactions) of cosmic-ray muons were investigated by a combined arrangement of the Mutron magnet spectrometer and calorimeter. The interactions covered their transferred energies ranging from 1 GeV to several TeV produced by muons with energies up to 10 TeV. There is reasonable agreement between the experimental results and the theoretical predictions. For transferred energies less than 10 GeV, however, the observed number of events produced by muons around 1 TeV may be somewhat smaller than theoretically expected. The probability of accompaniment of a muon emerging from thick iron plates is also studied. The data are very useful for the measurement of the muon momentum by the magnet spectrometer. The ratio of the interaction probability for positive muons to that for negative muons is 0.94±0.02 for interactions with energy transfers over 1 GeV. However, by considering the measured accuracy of the value ±0.05 used for the charge ratio of incident muons, there is no evidence to support any suggestion that the interaction cross-sections of positive and negative muons for energy transfers above 1 GeV differ in the range from 100 GeV to 10 TeV.
Riassunto
Sono state studiate le interazioni elettromagnetiche (escludendo le interazioni nucleari) dei muoni dei raggi cosmici mediante una disposizione combinata dello spettrometro a magneti Mutron e del calorimetro. Le interazioni riguardano le energie trasferite che vanno da 1 GeV a qualche TeV prodotte da muoni con energie fino a 10 TeV. Si trova un discreto accordo tra i risultati sperimentali e le previsioni teoriche. Per energie trasferite minori di 10 GeV, comunque, il numero osservato di eventi prodotti da muoni a circa 1 TeV può essere un po’ piú piccolo di quanto previsto teoricamente. Si studia anche la probabilità di accompagnamento di un muone uscente da spesse piastre di ferro. I dati sono molto utili per misurare l’impulso del muone con lo spettrometro a magneti. Il rapporto tra la probabilità d’interazione per muoni positivi e quella per muoni negativi è di 0.94±0.02 per interazioni con trasferimenti di energia al di sopra di 1 GeV. Comunque, considerando l’accuratezza misurata del valore ±0.05 usato per il rapporto di carica dei muoni incidenti, non c’è nessuna prova che sostenga l’ipotesi che le sezioni d’urto d’interazione tra muoni positivi e negativi per trasferimento d’energia al di sopra di 1 GeV differiscano nell’intervallo da 100 GeV a 10 TeV.
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The work was supported by a Grant-in-Aid from the Ministry of Education.
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Mitsui, K., Okada, A., Kawashima, Y. et al. Electromagnetic interactions of cosmic-ray muons up to 10 TeV (pair productions and bremsstrahlung). Nuov Cim A 73, 235–261 (1983). https://doi.org/10.1007/BF02734667
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DOI: https://doi.org/10.1007/BF02734667