Other
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204...47w&link_type=abstract
Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 1, p. 47-54.
Other
2
Abundance, Atomic Excitations, Cosmic Rays, Gas Ionization, Interstellar Gas, Ion Production Rates, Ionization Cross Sections, Particle Interactions, Radiant Heating
Scientific paper
Calculations are presented and employed in conjunction with available experimental data to estimate cross sections for multiple ionization of atoms by low-energy (MeV/nucleon) cosmic rays. The efficiency of multiple ionization increases rapidly with the charge of the cosmic ray, so that heavier (Z at least 6) nuclei are the dominant contributors for cosmic-ray compositions deduced from higher-energy cosmic rays. Multiple ionization dominates in the production of certain highly ionized atoms by cosmic rays under typical interstellar conditions. N v is considered explicitly, and its production rate by low-energy cosmic rays is estimated to be enhanced by a factor of about 5 to 100. For a low-energy cosmic-ray flux of the proposed intensity for heating and ionizing the interstellar gas, the predicted abundance for N v will be near or above the observed limit if previous calculations are otherwise correct.
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