Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....5.1751c&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
1
Scientific paper
We report new and revised high resolution measurements of the isotopic composition of Galactic cosmic rays in the Solar system using data from the High Energy Telescope (HET) on the Ulysses Spacecraft. These data have significantly improved statistics compared with our earlier measurements. Mass resolution varies from ~0.08 to ~0.31 u at observed energies of ~100 to ~300 MeV/u for elements Be to Ni. 1. Introduction The isotopic composition of Galactic cosmic rays provides unique information on crucial questions concerning the astrophysics of cosmic rays. Corrected for propagation, cosmic ray isotopic abundance measurements provide clues to the source of the cosmic rays and insight into Galactic chemical evolution. Secondary radioisotopes test models of cosmic ray propagation and confinement in the Galaxy, including the extent of a possible Galactic magnetic halo. Secondary electron capture nuclides address cosmic ray reacceleration. The Ulysses Mission is a joint NASA and ESA project. The spacecraft was launched on Oct. 6, 1990 on the shuttle Discovery and, via a gravitation assist at Jupiter, was inserted into a Solar orbit with a perihelion of 1.34 AU, aphelion of 5.4 AU and an ~80o heliographic inclination. The data presented here covers the period from launch through the middle of 2000, corresponding to double the statistics in some of our previous papers. This is also our first report on the isotopes of B, Ar, K, Ca, Cr and Co. The measurements presented here are of isotopic abundances in the Solar system. A full interpretation awaits completion our ongoing analysis of elemental composition.
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