Relativistic interaction of22Ne and26Mg in hydrogen and the cosmic-ray implications
Document Type
Article
Publication Date
1-1-1997
Abstract
The isotopic production cross sections for 22Ne projectiles at 377,581, and 894 MeV nucleon-1 and 26Mg projectiles at 371 and 576 MeV nucleon-1 interacting in a liquid hydrogen target have been measured by the Transport Collaboration at the Lawrence Berkeley Laboratory Heavy-Ion Spectrometer System (LBL HISS) facility. These cross sections are compared with those predicted by semi-empirical formulae. The systematics are studied to develop suitable inputs for calculations of galactic cosmic-ray interstellar transport. These calculations are used to unfold the transport effects from available observations of cosmic-ray CNO isotopes to extract the underlying source composition. With these new cross section measurements, the previously reported enhancement of 18O at the cosmic-ray source, which is sensitive to the cross sections for production from 22Ne and 26Mg and the uncertainties in cross section prediction formulae, may be explained. There is no evidence for an enhancement of 18O when these new cross sections are used in a weighted slab propagation calculation. © 1997. The American Astronomical Society. All rights reserved.
Publication Source (Journal or Book title)
Astrophysical Journal
First Page
504
Last Page
521
Recommended Citation
Chen, C., Albergo, S., Caccia, Z., Costa, S., Crawford, H., Cronqvist, M., Engelage, J., Greiner, L., Guzik, T., Insolia, A., Knott, C., Lindstrom, P., Mcmahon, M., Mitchell, J., Potenza, R., Russo, G., Soutoul, A., Testard, O., Tull, C., Tuvé, C., Waddington, C., Webber, W., & Wefel, J. (1997). Relativistic interaction of22Ne and26Mg in hydrogen and the cosmic-ray implications. Astrophysical Journal, 479 (1 PART I), 504-521. https://doi.org/10.1086/303881