Summary
Measurements of the energy transfer,E′, of bursts produced in a calorimeter are calibrated with the momenta of the incoming and outgoing muons measured by the Mutron magnet spectrometers. The relation between energy transferE′ and momentum difference Δpc was obtained in the energy range from 30 GeV to 1 TeV as follows:E′=(0.85±0.16) Δpc. Using this calibrated calorimeter, we observed distributions of the energy transfer of bursts produced in the calorimeter up to 6 TeV by the magnet spectrometer plus calorimeter triggers, as well as by the calorimeter trigger alone. From the observed burst spectrum, we have derived the muon energy spectrum at sea-level. The differential pion production spectrum combined with the data using composite triggers gives an exponentγ=2.58±0.19 in the muon energy region from 200 GeV to 6 TeV and 2.74±0.19 in the region from 1 TeV to 6 TeV. The muon energy spectrum thus obtained is compared with the direct measurement of the muon spectrum by the Mutron magnet spectrometers. It is thus established that measurements of the transferred energy spectrum of bursts are available for the derivation of the muon energy spectrum beyond the energy region measured by the magnet spectrometer.
Riassunto
Si calibrano le misure del trasferimento d’energiaE′ di scrosci prodotti in un calorimetro con gl’impulsi dei muoni in entrata e in uscita misurati dagli spettrometri a magneti Mutron. Si ottiene la relazione tra il trasferimento di energiaE′ e la differenza d’impulsi Δpc nell’intervallo di energia da 30 GeV a 1 TeV come segue:E′=(0.85±0.16)Δpc. Usando questo calorimetro calibrato, sono state osservate le distribuzioni del trasferimento d’energia di scrosci prodotti nel calorimetro fino a 6 TeV sia mediante l’innesco dello spettrometro a magneti piú quello del calorimetro, che solamente con quello del calorimetro. Dallo spettro degli scrosci osservato, è stato derivato lo spettro d’energia dei muoni a livello del mare. Lo spettro differenziale di produzione di pioni combinato con i dati ottenuti usando inneschi composti dà un esponenteγ=2.58±0.19 nella regione d’energia muonica da 200 GeV a 6 TeV e 2.74±0.19 nella regione da 1 TeV a 6 TeV. Lo spettro d’energia muonica cosí ottenuto è confrontato con la misura diretta dello spettro muonico degli spettrometri a magneti Mutron. Si stabilisce cosí che le misure dello spettro d’energia trasferita degli scoppi permettono di derivare lo spettro d’energia muonica al di là della regione d’energia misurata dallo spettrometro a magneti.
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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. Cosmic-ray muon spectrum derived from the transferred energy spectrum of bursts observed by the mutron calorimeter. Nuov Cim A 73, 209–234 (1983). https://doi.org/10.1007/BF02734666
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DOI: https://doi.org/10.1007/BF02734666