Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..680g&link_type=abstract
Astrophysical Journal (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 680-684.
Astronomy and Astrophysics
Astrophysics
15
Cosmic Rays, Heao 3, Manganese Isotopes, Nuclear Astrophysics, Radioactive Decay, Atomic Clocks, Iron Isotopes, Kinetic Energy
Scientific paper
Radioactive Mn-54 suggested as a 'clock' for measuring the lifetime of heavy cosmic rays, has a poorly known beta-decay half-life estimated to be in the range from 10 exp 5 to 10 exp 7 yr. Some years ago Koch et al. (1981) concluded from measurements of the Mn/Fe ratio that a significant fraction of low-energy Mn-54 produced by Fe fragmentation had decayed. Using a propagation code that includes improved fragmentation cross-sections, and recent data from HEAO 3 and a number of other spacecraft, the evidence for Mn-54 decay in cosmic rays has been reexamined. It is concluded that present cosmic-ray data cannot establish the degree of Mn-54 decay, but point out that this question has important implications for studies of the Fe-54 abundance in cosmic-ray source material, as well as for cosmic-ray propagation studies.
Grove Eric J.
Hayes B. T.
Mewaldt Richard A.
Webber William R.
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