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Published 1997 | Published
Book Section - Chapter Open

An Experiment to Measure the Elemental Abundances of Ultra-Heavy Cosmic Rays


Measurements of the elemental abundances of galactic cosmic ray nuclei with charge 26≤z≤92 can provide important information that should help to resolve the question of cosmic-ray origin; i.e. whether cosmic rays originate from the acceleration of interstellar grain material or from preferential selection and acceleration of nuclei from stellar photosphere-chromosphere regions with T-10^4 based on first ionization potential. They will also refine tests of whether freshly synthesized rprocess material is a significant component in cosmic rays. The detector concept described utilizes an array of silicon detectors for dF/dx measurements, two Cherenkov counters with radiators of different refractive index for velocity determination (one using aerogel and one using a novel waveshifter readout approach), and scintillating fibers for a hodoscope/time-of-flight detector. The numbers of particles which can be collected with this approach and the expected charge resolution are discussed.

Additional Information

© Space Research Unit. Provided by the NASA Astrophysics Data System. This work was supported in part by NASA grants at Washington University, Caltech, GSFC, JPL, and in pan by the McDonnell Center for the Space Sciences at Washington University.

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