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Primary cosmic-ray alpha particles - III

  • Published:
Il Nuovo Cimento (1955-1965)

Summary

Nuclear photographic emulsions were exposed to the cosmic radiation on a high altitude balloon flight at 49° N geomagnetic latidude on 3rd August 1958. The total flux of primary alpha-particles, having kinetic energies greater than 400 MeV/nucleon, was found to be (87±8) particles/m2 ster s. Simultaneously, another set of emulsions was exposed at 61° N geomagnetic latitude. A comparison of the data obtained from the two nights leads to an estimate of the geomagnetic cut-off for 49° N as (500±50) MeV/nucleon kinetic energy.

Riassunto

Si sono esposte emulsioni fotograflolie nucleari alla radiazione cosmica in un volo con pallone a grande altitudine a 49° N geomagnetici il 3 Agosto 1958. Si c trovato che il flusso totale di particelle α, aventi énergie cinetiche maggiori di 400 MeV/nucleone, è di (87±8) particelle/m2 sr s. Contemporaneamente un altro gruppo di emulsioni fu esposto a 61° N geomagnetici. Un confronto dei dati ottenuti dai due voli porta ad una valutazione del cut-off geomagnetico per 49° N di (500±50) MeV/nucleone di energia cinetica.

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Authors and Affiliations

  1. Department of Physics, Washington University, St. Louis, Mo.

    M. W. Friedlander & C. T. Spring

Authors
  1. M. W. Friedlander
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  2. C. T. Spring
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Additional information

Research supported by the Air Force Office of Scientific Research, the U.S. Army Research Office (Durham), the National Science Foundation and the Research Corporation.

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Friedlander, M.W., Spring, C.T. Primary cosmic-ray alpha particles - III. Nuovo Cim 26, 1292–1300 (1962). https://doi.org/10.1007/BF02780357

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  • DOI: https://doi.org/10.1007/BF02780357

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