The abundance of the radioactive isotope Al-26 in galactic cosmic rays

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Abundance, Aluminum 26, Galactic Cosmic Rays, Beryllium 10, Chronology, Radioactive Isotopes, Satellite Observation

Scientific paper

Satellite observations of the isotopic composition of aluminum in low energy cosmic rays (E/M = 200 MeV/amu) have been used to determine the abundance of the unstable isotope Al-26 (T1/2 = 0.87 Myr). The observed abundance ratio, Al-26/Al-27 = 0.036 (+0.037, -0.022), is in good agreement with previous balloon observations and yields a cosmic ray confinement time consistent with values based on the abundance of Be-10.

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