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Il Nuovo Cimento (1955-1965)

, Volume 28, Issue 6, pp 1238–1245 | Cite as

Nuclear interactions of the secondary particles of high-energy cosmic-ray « jets »

  • E. Farrow
  • C. F. Gauld
  • C. B. A. McCusker
  • J. Malos
  • K. Nishikawa
  • L. S. Peak
  • L. G. Van Loon
Article

Summary

Fifty-live interactions in the energy range 1 to 100 GeV of secondary particles of cosmic-ray jets have been examined. The energy was determined by finding the angle between the secondary and primary direction and assuming a transverse momentum of 0.4 GeV/c. The interaction mean free path was 41.7 cm, the average number of shower particles varied from 1.3 to 6.4 and the average number of black prongs from 5.8 to 8.3 as the energy went from 2.8 to 34.6 GeV. The agreement with machine work is good, in contrast to previous experiments where the Castagnoli method of energy estimation and/or area scanning was used. The application of the method to energies around 1000 GeV is discussed.

Riassunto

Si sono esaminate nell’intervallo di energia da 1 a 100 GeV 55 interazioni di particelle secondarie di getti di raggi cosmici. Si e determinata l’energia trovando l’angolo fra la direzione dei secondari e quella dei primari e prendendo un impulso trasversale di 0.4 GeV/c. II cammino medio di interazione era 41.7 em, il numero medio di particelle dello sciame variava fra 1.3 e 6.4 e il numero medio di rami neri fra 5.8 e 8.3 quando l’energia passava da 2.8 a 34.6 GeV. Si ha un buon accordo con le determinazioni eseguite sugli acceleratori, contrariamente agli esperimenti preoedenti in cui si è usato il metodo di Castagnoli per determinare l’energia e/o l’esplprazione per superficie. Si discute l’applicazione del metodo ad energie attorno ai 1000 GeV.

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Copyright information

© Società Italiana di Fisica 1963

Authors and Affiliations

  • E. Farrow
    • 1
  • C. F. Gauld
    • 1
  • C. B. A. McCusker
    • 1
  • J. Malos
    • 1
  • K. Nishikawa
    • 1
  • L. S. Peak
    • 1
  • L. G. Van Loon
    • 1
  1. 1.Falkiner Nuclear Department, School of PhysicsUniversity of SydneySydney

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