The fermi mechanism and the source spectrum of cosmic ray nuclei

Details The fermi mechanism and the source spectrum of cosmic ray nuclei The fermi mechanism and the source spectrum of cosmic ray nuclei

Aug 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ap%26ss..17..467r&link_type=abstract

Astrophysics and Space Science, Volume 17, Issue 2, pp.467-471

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

It is shown that the velocity term, occurring in the expression for the rate of energy gain by the Fermi mechanism of acceleration, is to be taken into account in case of acceleration of non-relativistic particles. A spectral form of accelerated particles is derived on this basis and is called the ‘Fermi Spectrum’. At non-relativistic energies this spectral form is significantly different from the currently used forms of power law in total energy per nucleon and in rigidity, and lies about midway between them. It is shown that using this form of source spectrum of cosmic ray nuclei, satisfactory agreement can be obtained between the calculated values and the observed ones of the ratios of H2/He4 and He3/He4, and the energy spectra of protons and helium nuclei near the Earth.

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