Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aipc..207..622s&link_type=abstract
IN: Astrophysics from the moon; Proceedings of the Workshop, Annapolis, MD, Feb. 5-7, 1990 (A91-56576 24-89). New York, American
Astronomy and Astrophysics
Astrophysics
Galactic Cosmic Rays, Heavy Nuclei, Lunar Based Equipment, Radiation Counters, Abundance, Actinide Series, Lunar Surface, Neutron Absorbers, Thorium, Uranium
Scientific paper
A passive, large-area experiment for the detection of cosmic ray actinides on the lunar surface is discussed. Due to the absence of a geomagnetic cutoff, a 100 sq m array of nuclear-track-detecting glass plates in 5 years will detect about 300-1000 U and Th cosmic ray nuclei of energies greater than 0.85 GeV/u (compared to the present world's total of 4 actinides). With a charge resolution at uranium of about 0.25e, the U/Th ratio can be accurately determined, thereby dating the r-process component of the cosmic rays; the presence of a fresh r-process component would be corroborated by the likely detection of transuranics as well. In addition, abundances in the Pt/Pb and sub-Pt/Pb regions and abundances of secondary actinides would provide detailed data on the 0-1 g/sq cm region of the cosmic ray path length distribution, hence on the astrophysical site of origin of these cosmic rays.
Buford Price P.
Salamon Michael H.
Tarle Greg
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