Origin of Cosmic Rays pp 31-32 | Cite as
The Charge and Isotopic Composition of Z ≥ 10 Nuclei in the Cosmic Ray Source
Abstract
Interstellar fragmentation provides the greatest contribution to the abundance of cosmic ray nuclei with Z = 17–25 observed at earth. The usual procedure to estimate the source abundance of these nuclei is to correct for this interstellar fragmentation using a propagation model and a set of fragmentation parameters for Fe nuclei and its products. Only a fraction of these fragmentation parameters have actually been measured and the accuracy of these as well as the semi empirical parameters used for the unmeasured cross sections is no better than ± 10–15%. As a result the actual source abundances of these nuclei can only be deduced to an accuracy of ± 2–3% of the Fe abundance.
Keywords
Source Abundance Fragmentation Parameter Interstellar Space Balloon Flight Interstellar FragmentationReferences
- Cook, W.R., Stone, E.C. and Vogt, R.E., Ap. J. (in press).Google Scholar
- Israel, M.H., Klarmann, J., Love, P.L., and Tueller, J., 1979, Proc. 16th Int. Cosmic Ray Conf., Kyoto, 1, 323.Google Scholar
- Lezniak, J.A., and Webber, W.R., 1978, Ap. J., 223, 676.ADSCrossRefGoogle Scholar
- Menwaldt, R.A., Stone, E.C., Vogt, R.E., 1979, Ap., J., 231, L97ADSCrossRefGoogle Scholar
- Webber, W.R., Kish, J., and Simpson, G., 1979a, Proc. 16th Int. Cosmic Ray Conf., Kyoto, 1, 424.Google Scholar
- Webber, W.R., Kish, J., and Simpson, G., 1979b, Proc. 16th Int. Cosmic Ray Conf., Kyoto, 1, 430.Google Scholar
- Young, J.S., 1979, PhD Thesis, University of Minnesota.Google Scholar