Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.j7001b&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #J7.001
Physics
Scientific paper
The Cosmic Ray Isotope Spectrometer (CRIS) launched aboard NASA's Advanced Composition Explorer (ACE) in 1997 has measured the relative isotopic abundances of the galactic cosmic rays over the charge range 3≤ Z≤ 28 for energies of ˜ 50≤ E (MeV/nucleon)≤ 600. We present our measurements of the neon, iron, and nickel isotopic abundances from the ACE-CRIS experiment. The ^22Ne/^20Ne abundance ratio is enriched at the cosmic ray source by a factor of 5.0± 0.2 over that of the solar wind, and the ^58Fe/^56Fe ratio is enriched by a factor of 1.7± 0.3 over solar system abundances. Recent two-component Wolf-Rayet (including rotation) and supernovae models in which cosmic rays at earth preferentially sample material from the galactic interior provide predictions for the neon, iron and nickel isotopic abundances. We will compare the CRIS Ne, Fe, and Ni isotopic source abundance ratios with predictions from these models.
Binns Robert W.
Cummings Alan C.
Israel Martin H.
Leske Richard A.
Mewaldt Richard A.
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