Summary
The relative abundances of the different charge groups of heavy cosmic-ray nuclei under less than 12 g/cm2 of atmosphere and packing, were measured in a stripped-emulsion stack flown at geomagnetic latitude 41° N. A minimum potential range of 4.5 cm in emulsion was required for the acceptance of any track. Identification was based on measurements of δ-ray density. Charge calibration was obtained from grain counts and gap-length measurements on identified protons and deuterons coming to rest in the emulsion. The flux of beryllium and boron was found to be comparable with that of carbon, nitrogen and oxygen nuclei.
Riassunto
In un pacco di emulsioni nude esposto alla latitudine geomagnetica di 41° N si sono misurate le abbondanze relative dei differenti gruppi di carica sotto meno di 12 g/cm2 di atmosfera e copertura. Per l’accettazione delle tracce fu richiesto un percorso potenziale minimo di 4.5 cm in emulsione. L’identificazione fu basata sulle misure di densità dei raggi δ. La misura delle cariche fu eseguita col conteggio dei granuli e la misura dei gas su protoni identificati e deutoni arrestati nell’emulsione. Si 7`e trovato che il flusso dei nuclei di berillio e di boro è confrontabile con quello dei nuclei di carbonio, azoto ed ossigeno.
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Also supported by the Nuclear Research Foundation within the University of Sydney.
The team of scanners who have taken part in this work consisted of Mrs.B. Chartres, Mrs.I. Docherty, Mrs.M. Rabbitt, Mrs.A. Thow, Mrs.K. Woodger and MissM. Woodward. The figures and the photomicrograph were prepared by MissS. A. O’Reilly. Our thanks are due to the U. S. Office of Naval Research who arranged the balloon exposure, and to ProfessorH. Messel and the Nuclear Research Foundation within the University of Sydney for the excellent facilities put at our disposal. One of us (B. J. O’B.) is indebted to the Research Committee of the University of Sydney for a Research Studentship.
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Noon, J.H., Herz, A.J. & O’Brien, B.J. An observed cosmic-ray flux of light elements at 41° N. geomagnetic latitude. Nuovo Cim 5, 854–865 (1957). https://doi.org/10.1007/BF02903208
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DOI: https://doi.org/10.1007/BF02903208