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 10(exp 5) yr.


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    Titel :

    The isotopic composition of iron-group galactic cosmic rays


    Beteiligte:
    Wiedenbeck, M. E. (Autor:in) / Leske, R. A. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.1995



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    The Isotopic Composition of Iron-Group Galactic Cosmic Rays

    Wiedenbeck, M.E. | Online Contents | 1994


    The Isotopic Composition of Iron-Group Galactic Cosmic Rays

    Wiedenbeck, M. E. / Leske, R. A. / International Council of Scientific Unions; Committee on Space Research | British Library Conference Proceedings | 1994


    Galactic cosmic rays

    Hayakawa, S. | Elsevier | 1984


    The isotopic composition of cosmic rays

    Wiedenbeck, M. E. | NTRS | 1984


    The isotopic composition of cosmic rays

    Wiedenbeck, M.E. | Elsevier | 1984