The isotopic composition of galactic cosmic-ray iron nuclei

Details The isotopic composition of galactic cosmic-ray iron nuclei The isotopic composition of galactic cosmic-ray iron nuclei

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236l.121m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 236, Mar. 15, 1980, p. L121-L125.

Physics

Nuclear Physics

13

Abundance, Cosmic Rays, Galactic Radiation, Iron Isotopes, Nuclear Fusion, Nuclei (Nuclear Physics), International Sun Earth Explorer 3, Iron 57, Mass Ratios

Scientific paper

High-resolution observations made in interplanetary space of 83-284 MeV per nucleon galactic cosmic-ray iron isotopes are reported and it is directly established that Fe-56 is the dominant cosmic-ray Fe isotope. The following percentage abundances for Fe at the cosmic-ray source are found: Fe-54 = 9(+8, -5)%, Fe-55 is less than or equal to 7%, Fe-56 = 91(+5, -11)%, Fe-57 is less than or equal to 8%, and Fe-58 is less than or equal to 6%. When compared to calculated nucleosynthesis yields and other observations, these results place significant constraints on the neutron excess of the environment where cosmic-ray Fe originates.

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