New Results on the Relative Abundance of Actinides in the Cosmic Radiation

Details New Results on the Relative Abundance of Actinides in the Cosmic Radiation New Results on the Relative Abundance of Actinides in the Cosmic Radiation

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..109d&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

The DIAS-ESTEC Ultra Heavy Cosmic Ray Experiment (UHCRE) on the Long Duration Exposure Facility (LDEF), collected approximately 3000 cosmic ray nuclei with Z>65 in the energy region E>1.5 GeV/nucleon during a six year exposure period in Earth orbit. Most (97%) of the accessible collecting area of the solid state nuclear track detector array has now been scanned, yielding a sample of 30 actinides (from an exposure of ≈ 150 m2 sr yr). The charge frequency distribution for Z>70 is presented. The current best value for the cosmic ray actinide relative abundance (Z≥88)/(74≤Z≤87) is reported and discussed in relation to current theories of cosmic ray origin.

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