Neutron-rich isotopes of cosmic rays with Z between 9 and 16

Details Neutron-rich isotopes of cosmic rays with Z between 9 and 16 Neutron-rich isotopes of cosmic rays with Z between 9 and 16

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l.119m&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 2, p. L119-L123.

Astronomy and Astrophysics

Astrophysics

4

Abundance, Cosmic Rays, Heavy Nuclei, Nuclear Fusion, Cerenkov Radiation, Neutron Distribution, Radiation Sources, Scintillation Counters, Solar System

Scientific paper

Data are reported on the isotopic composition of cosmic rays with charges between 9 and 16 at a temperature of 450 MeV per amu. The data show the presence of a considerable neutron-rich component of Mg and Ne, the measured mean masses being 24.3 plus or minus 0.1 and 20.8 plus or minus 0.1, respectively. Coupled with a calculation of the evolution of cosmic-ray isotopic abundances during propagation, these masses indicate that there is probably some neutron-rich material in this charge range at the cosmic-ray source. To explain the Ne mass requires more neutron-rich Ne at the source than is observed in solar-system material. This result is discussed in light of recent theories of nucleosynthesis and cosmic-ray propagation.

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