Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...25w&link_type=abstract
Advances in Space Research, vol. 15, no. 1, p. (1)25-(1)33
Computer Science
1
Abundance, Electron Capture, Galactic Cosmic Rays, Interstellar Matter, Iron Isotopes, Nuclear Fusion, Electron Decay Rate, International Sun Earth Explorers, Satellite Observation
Scientific paper
Results from studies of the isotopic composition of iron group elements in the galactic cosmic radiation are reviewed, emphasizing recently reported measurements from the ISEE-3 spacecraft. The observed isotope distributions for the elements Ti through Mn are in good agreement with those expected for a propagated solar-like source composition, with the possible exception of an enhanced abundance of Ti-50. It is found that a significant fraction of the radioactive secondary nuclide Mn-54 has decayed, indicating a confinement time of iron group cosmic rays in the galaxy of at least 2 Myr. The source ratio Fe-54/Fe-56 is found to be consistent with the solar value, but the ratio Ni-60/Ni-58 is greater than solar by a factor of 2.8+/-1.0. The measured abundance of Co-59 is significantly greater than the calculated secondary contribution, suggesting that this nuclide has been produced in the source regions by the electron capture decay of Ni-59 and implying a time delay between nucleosynthesis and acceleration approximately greater than 105 yr.
Leske Richard A.
Wiedenbeck Mark E.
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