Il Nuovo Cimento (1955-1965)

, Volume 32, Issue 6, pp 1497–1504 | Cite as

Pt distribution of the secondary particles of cosmic-ray jets

  • K. Imaeda
  • J. Avidan


By appropriate variation of the parameters involved in the followingP t distributions: I) Planck’s distribution (PD), II) the distributionP t exp [−Pt/P0] dP t , (LD) and III) the distribution (2/α2) exp [−P t 2 /α2]P t dP t (BD), a best fit was determined to the experimentalP t distribution using thes2-test. The results show that the experimental distribution may be fitted in a satisfactory manner to the theoretical distributions (PD) and (LD) but not to (BD). The average values ofP t and the parameters, thus obtained, are 296 MeV/c, 308 MeV/c and 292 MeV/c corresponding tokT=0.122 GeV,p0c=0.154 GeV andα=0.387 GeV/c, respectively. The parameters for the high-energy group (energy of the primary greater than 4.5 TeV) and the low-energy group (energy of the primary less than 4.5 TeV) show no significant difference andP t remains constant for different values of the primary energy.


Con una opportuna variazione dei parametri interessati nelle seguenti distribuzioni diP t : I) distribuzione di Planck (PD), II) la distribuzioneP t exp[−P t /P0]dP t (LD), e III) la distribuzione (2/α2) exp [−P t 2 /α2]P t dP t (BD), si è determinata una migliore approssimazione alla distribuzione sperimentale diP t usando il testX2. I risultati mostrano che la distribuzione sperimentale può essere adattata in modo soddisfacente alle distribuzioni teoriche (PD) ed (LD) ma non a (BD). I valori medi diP t e i parametri, così ottenuti, sono 296 MeV/c, 308 MeV/c e 292 MeV/c, corrispondenti ekT=0.122 GeV,p0c=0.154 GeV edα=0.387 GeV/c, rispettivamente. I parametri per il gruppo di alta energia (energia dei primari maggiore di 4.5 TeV) e per il gruppo di bassa energia (energia dei primari minore di 4.5 TeV) non presentano significative differenze eP t rimane costante per differenti valori dell’energia dei primari.


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Copyright information

© Società Italiana di Fisica 1964

Authors and Affiliations

  • K. Imaeda
    • 1
  • J. Avidan
    • 1
  1. 1.School of Cosmic PhysicsDublin Institute for Advanced StudiesDublin

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