High resolution measurements of galactic cosmic-ray neon, magnesium, and silicon isotopes

Journal Article · Tue Jan 15 04:00:00 EST 1980 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183166· OSTI ID:5536247

Mewaldt, R A; Spalding, J D; Stone, E C; Vogt, R E

The individual isotopes of galactic cosmic-ray Ne, Mg, and Si at approx.100 MeV per nucleon have been clearly resolved with an rms mass resolution of approx.0.20 amu. Our results suggest that the cosmic-ray source is enriched in /sup 22/Ne, /sup 25/Mg, and /sup 26/Mg when compared to the solar system. In particular, we find (/sup 25/Mg+/sup 26/Mg)//sup 24/Mg=0.49(+0.23, -0.14) compared with the solar system value of 0.27, suggesting that the cosmic-ray source and solar system material were synthesized under different conditions.

• Research Organization: California Institute of Technology
• OSTI ID: 5536247
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 235:2; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640101* -- Astrophysics & Cosmology-- Cosmic Radiation
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALINE EARTH ISOTOPES
CHEMICAL COMPOSITION
CHEMISTRY
COSMIC NUCLEI
COSMIC RADIATION
COSMIC RAY SOURCES
COSMOCHEMISTRY
GALAXIES
IONIZING RADIATIONS
ISOTOPES
MAGNESIUM ISOTOPES
MILKY WAY
NEON ISOTOPES
NUCLEI
NUCLEOSYNTHESIS
RADIATIONS
SILICON ISOTOPES
SOLAR SYSTEM