Summary
The effect of ionization loss on a primary cosmic ray spectrum of the formN A, Z (ε)=K(A, Z)γ/εγ+1 is calculated for1H,9Be,12C,19F,27Al,40Ca and56Fe as representative of the charge spectrum of primary cosmic rays. The calculation is carried out for passage through 2, 4, 6 and 10 g/cm2 of hydrogen and also for a model in which the amount of material traversed is inversely proportional to the momentum. The observable effects obtained,i.e. the shift of the maximum towards higher velocity with increasingZ and the relative enrichment of the lighter nuclei/energy interval at low energies are compared with the experimental data obtainable. Some discussion of the implications for aspects of the origin of cosmic rays is given.
Riassunto
Si calcola, con riferimento ad uno spettro primario dei raggi cosmici della formaN A, Z (ε)=K(A, Z)γ/εγ+1, l’effetto della perdita per ionizzazione per1H,9Be,12C,19F,27Al,40Ca e56Fe in quanto rappresentativi dello spettro delle cariche dei raggi cosmici primari. Si eseguono i calcoli per il passaggio attraverso 2, 4, 6, e 10 g/cm2 di idrogeno e per un modello in cui la quantità di materiale attraversato è inversamente proporzionale alla quantità di moto. Si confrontano gli effetti osservabili ottenuti, cioè lo spostamento del massimo verso le velocità maggiori al crescere diZ e l’arricchimento relativo di nuclei più leggeri in rapporto ad un intervallo di energie alle basse energie, con i dati sperimentali reperibili. Se ne discutono le conseguenze sulle probabili origini dei raggi cosmici.
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This research was supported in part by the United States Air Force through the Office of Scientific Research, Air Research and Development Command.
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Appa Rao, M.V.K., Kaplon, M.F. The influence of ionization loss on the shape of the differential primary cosmic ray energy-spectrum. Nuovo Cim 27, 700–717 (1963). https://doi.org/10.1007/BF02784575
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DOI: https://doi.org/10.1007/BF02784575