Summary
The effect of spallation and ionization loss on the relative abundances and energy spectra of cosmic-ray nuclei of charge greater than two, during their propagation in the interstellar and interplanetary space, has been determined. Comparison of the results with experimental observations indicates that cosmic-ray nuclei travel an amount of interstellar hydrogen proportional to (ε 2−1)−x (whereε is the total energy of the nuclei in terms of their rest mass) withx between 0.16 and 0.25 and with the high-energy nuclei (ε=4) traversing 2 to 2.5 g/cm2 of interstellar hydrogen.
Riassunto
Si è determinato l’effetto della perdita per frazionamento e ionizzazione sulle abbondanze e gli spettri d’energia dei nuclei dei raggi cosmici con carica maggiore di due, durante la loro propagazione nello spazio interstellare ed interplanetario. Il confronto dei risultati con le osservazioni sperimentali indica che i nuclei dei raggi cosmici attraversano una quantità di idrogeno interstellare proporzionale ad (ε−1)−x (in cuiε è l’energia totale dei nuclei in funzione della loro massa di quiete) conx compreso fra 0.16 e 0.25, mentre i nuclei di alta energia (ε=4) attraversano da 2 a 2.5 g/cm2 di idrogeno interstellare.
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This research was supported by the Air Force Office of Scientific Research under Grant No. AF-AFOSR-62-32.
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Appa Rao, M.V.K. On the modulation of cosmic-ray nuclei with Z>2 during their propagation. Nuovo Cim 32, 1158–1165 (1964). https://doi.org/10.1007/BF02726058
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DOI: https://doi.org/10.1007/BF02726058