The abundance of the radioactive isotope Al-26 in galactic cosmic raysSatellite 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.
Document ID
19850040838
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wiedenbeck, M. E. (Chicago, University Chicago, IL; California, University, Berkeley, CA, United States)