Galactic Cosmic Ray Manganese Isotopes

Details Galactic Cosmic Ray Manganese Isotopes Galactic Cosmic Ray Manganese Isotopes

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may.k1012d&link_type=abstract

American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #K10.12

Physics

Scientific paper

The High Energy Telescope (HET) aboard the Ulysses spacecraft provides excellent charge and mass resolution (Simpson et al., 1992, A&AS 92 365). Over 300 manganese events have been analyzed for their isotopic composition. Most of the manganese events are secondary spallation products of the heavier iron-group cosmic rays. The ^54Mn abundance implies a galactic density through which the cosmic rays pass of about 0.33 atoms/cm^3 for a β half-life of about 1 Myr. The corresponding confinement time for the iron-group cosmic rays is about 15 Myr. An abundance of the long-lived electron-capture species ^53Mn at the source cannot be ruled out. Therefore, this work does not constrain the time between nucleosynthesis and injection into the cosmic ray accelerator.

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