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Il Nuovo Cimento (1955-1965)

, Volume 8, Issue 6, pp 807–825 | Cite as

Identification of fast heavy nuclei of the cosmic radiation using nuclear emulsion techniques

  • B. J. O’Brien
  • J. H. Moon
Article

Summary

Various workers disagree in their measured charge spectra of the heavy nuclei of the primary cosmic radiation. This disagreement could be due to unreliable charge identification. Since there is inadequate information on comparison of measurement techniques, we have made measurements of six parameters of tracks of nuclei with 4 ⩽Z ⩽ 9 in a stack of G-5 stripped emulsion flown at 41 ‡N geomagnetic latitude. The θ-ray, blob, and isolated-grain densities, the Fowler-Perkins coefficient, integral gap length, and probability of development have been found for each track. Estimates have been made of the effect of various sources of error in these measurements, including a study of the change in each measured parameter with a 20% change in minimum grain density of the emulsion. From the comparison and analysis of these measurements, recommendations are given on the use of the above techniques in the identification of fast heavy nuclei in nuclear emulsion.

Riassunto

Vari autori sono in disaccordo per quanto riguarda le misure da loro eseguite sugl spettri della carica dei nuclei pesanti della radiazione cosmica primaria. Il disaccordo potrebbe essere causato da identiflcazioni inattendibili delle cariche. Poichè non si hanno dati adeguati sui confronti delle Dellaarie tecniche di misura, abbiamo eseguito le misure di 6 parametri di tracce di nuclei con 4⩽Z⩽9 in un pacco di emulsioni G-5 strappate fatte ascendere a 41‡ di latitudine geomagnetica. Per ogni traccia sono state troDellaate le densità di raggi δ, di blob e di granuli isolati, il coefflciente di Fowler-Perkins, la lunghezza integrale delle lacune e la probabilità di sDellailuppo. Si sono Dellaalutati gli effetti su tali misure di Dellaarie cause di errore, incluso lo studio delle Dellaariazioni di ogni singolo parametro misurato, con una variazione del 20% sulla densità minima dei granuli dell’emulsione. Dal confronto e l’analisi di tali misure scaturiscono avvertnze sull’impiego delle tecniche suddette per l’identificazione dei nuclei pesanti veloci nelle emulsioni nucleari.

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Copyright information

© Società Italiana di Fisica 1958

Authors and Affiliations

  • B. J. O’Brien
    • 1
    • 2
  • J. H. Moon
    • 1
    • 3
  1. 1.The F.B.S. Falkiner Nuclear Research and Adolph Basser Computing Laboratories, School of PhysicsThe University of SydneySydneyAustralia
  2. 2.Antarctic DivisionDepartment of External AffairsMelbourneAustralia
  3. 3.Physics DepartmentUniversity of QueenslandAustralia

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