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Il Nuovo Cimento (1955-1965)

, Volume 19, Issue 2, pp 265–273 | Cite as

Direct pair production by high energy muons

  • J. F. Gaebler
  • W. E. Hazen
  • A. Z. Hendel
Article

Summary

A multiplate cloud chamber was operated 1032ft undergound to study electromagnetic interactions of fast cosmic ray muons. 222 electron showers were observed. A histogram was obtained for transferred energies from 30 to 3 000 MeV. The showers are primarily due to direct pair production and knock-on processes. The results indicate that there is agreement with knock-on theory but that the direct pair production cross section is about 1/2 that predicted by the Murota-Ueda-Tanaka theory.

Riassunto

Per studiare le interazioni elettromagnetiche dei mnoni veloci dei raggi cosmici si è fatta funzionare una camera a nebbia a molte piastre a 1032 ft. sotto terra. Si è ottenuto un istogramma per le energie trasferite da 30 a 3 000 MeV. Gli sciami sono principalmente dovuti a produzione diretta di coppie e a processi di « knock-on ». I risultati indicano che vi è concordanza con la teoria del « knock-on » mentre la sezione d’urto della produzione diretta di coppie è circa 1/2 di quella predetta della teoria di Murota-Ueda-Tanaka.

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Copyright information

© Società Italiana di Fisica 1961

Authors and Affiliations

  • J. F. Gaebler
    • 1
  • W. E. Hazen
    • 1
  • A. Z. Hendel
    • 1
  1. 1.The University of MichiganAnn Arbor

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