Cosmic-ray age deduced from the $sup 10$Be abundance
Journal Article
·
· Astrophys. J., Lett., v. 201, no. 3, pp. L141-L144
OSTI ID:4100356
The first satellite measurements of the radioactive cosmic-ray species $sup 10$Be are reported. The abundance was measured near 100 MeV per nucleon with high-resolution solid-state telescopes on the IMP-7 and IMP-8 satellites during 1973--1974. These two independent measurements yield $sup 10$Be/Be ratios of less than 10 percent. Taken together with the galactic propagation model described in the text, these results show that the cosmic-ray ''clock'' lifetime (most probable value of approx.2times10$sup 7$ years) is significantly greater than that deduced for a nonimal interstellar gas density of approx.1--3 atoms cm$sup -3$. (AIP)
- Research Organization:
- Enrico Fermi Institute, University of Chicago
- NSA Number:
- NSA-33-017954
- OSTI ID:
- 4100356
- Journal Information:
- Astrophys. J., Lett., v. 201, no. 3, pp. L141-L144, Journal Name: Astrophys. J., Lett., v. 201, no. 3, pp. L141-L144; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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