Neutron-rich isotopes of cosmic rays with 9< or =Z< or =16

Journal Article · Mon Dec 15 04:00:00 EST 1975 · Astrophys. J., Lett., v. 202, no. 3, pp. L119-L123

DOI:https://doi.org/10.1086/181993· OSTI ID:4058120

Maehl, R C; Fisher, A J; Hagen, F A; Ormes, J F

New data is reported on the isotopic composition of cosmic rays with 9< or =Z< or =16 at Tapprox. =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+-0.1 and 20.8+-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. (AIP)

• Research Organization: NASA/Goddard Space Flight Center, Greenbelt, MD
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-023975
• OSTI ID: 4058120
• Journal Information: Astrophys. J., Lett., v. 202, no. 3, pp. L119-L123, Journal Name: Astrophys. J., Lett., v. 202, no. 3, pp. L119-L123; ISSN AJLEA
• Country of Publication: United States
• Language: English

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