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An upper limit of muon flux of energies above 100 TeV determined from horizontal air showers observed at Akeno (1985)

Kamata, K. ; Kawaguchi, S. ; Hara, T. ; [et al.]

In: CASI

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Publication Date: 2019-06-28

Description: Muon energy spectrum above 100 TeV was determined by observing the extensive air showers (EAS) from the horizontal direction (HAS). No definite muon originated shower of sizes above 100,000 and zenith angles above 60 deg was observed. The upper limits of HAS intensity is 5x10/12 m/2 s/1 sn/1 above 100,000. It is indicated that the upper limit of muon flux above 100 TeV is about 1.3x10/8 m/2 s/1 sr/1 and is in agreement with that expected from the primary spectrum with a knee assuming scaling in the fragmentation region and 40% protons in the primary beam. The critical energy at which muon flux from prompt processes take over that from the conventional process is higher than 100 Tev at horizontal direction.

Keywords: SPACE RADIATION

Type: HE-5.2-12 , 19th Intern. Cosmic Ray Conf - Vol. 8; p 69-72; NASA-CP-2376-VOL-8

Format: application/pdf

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