Cosmic-Ray Isotopic Composition Results from the ACE Mission

Creators: Wiedenbeck, M. E.

Others:: Dingus, Brenda L.; Kieda, David B.; Salamon, Michael H.

Abstract

The Cosmic Ray Isotope Spectrometer (CRIS) instrument on the Advanced Composition Explorer (ACE) mission has been making high precision measurements of the isotopic and elemental composition of galactic cosmic rays over the past two years. These observations have been used to investigate a range of topics including: 1) the nucleosynthetic processes that produced the cosmic-ray source material, 2) the processes responsible for fractionation of the elements in this material, 3) the time that elapsed between nucleosynthesis and acceleration to high energies, and 4) the confinement time of cosmic rays in the Galaxy. Highlights from CRIS investigations reported to date are summarized.

Additional Information

© 2000 American Institute of Physics. The work summarized here was performed by the ACE/CRIS team: N. E. Yanasak, J. S. George, W. R Binns, E. R. Christian, A. C. Cummings, P. L. 308 Downloaded 31 Aug 2010 to 131.215.196.47. Redistribution subject to AIP license or copyright; see http://proceedings.aip.org/about/rights_permissions Hink, R. A. Leske, M. Lijowski, J. Klarmann, S. M. Niebur, R. A. Mewaldt, E. C. Stone, and T. T. von Rosenvinge. This research w~is supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, the Goddard Space Flight Center, and Washington University.

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