SuperTIGER Abundances of Galactic Cosmic-Rays for the Charge Interval Z=41-56

• Main Authors: Walsh, N. E., Binns, W. R., Israel, M. H., Murphy, R. P., Rauch, B. F., Ward, J. E., Brandt, T. J., Link, J. T., Mitchell, J. W., Hams, T., Sakai, K., Sasaki, M., Labrador, A. W., Mewaldt, R. A., Stone, E. C., Wiedenbeck, M. E., Waddington, C. J.
• Format: Book Part
• Language: unknown
• Published: SISSA 2019
• Subjects: Williams Field; Antarc*; Antarctica
• Online Access: https://authors.library.caltech.edu/98061/; https://authors.library.caltech.edu/98061/1/ICRC2019_147.pdf; https://resolver.caltech.edu/CaltechAUTHORS:20190821-081636867

On December 8, 2012 the SuperTIGER (Super Trans-Iron Galactic Element Recorder) instrument was launched from Williams Field, Antarctica on a long-duration balloon flight that lasted 55 days and maintained a mean altitude of 125,000 feet. SuperTIGER measured the relative abundances of Galactic cosmic-ray nuclei with high statistical precision and well resolved individual element peaks from Neon to Zirconium (charges Z=10-40). SuperTIGER also made exploratory measurements of the relative abundances up to Barium (Z=56). Although the statistics are low for elements heavier than Zirconium, we will show how the relative abundances of charges Z=41-56 compare to those reported by HEAO3-HNE during 1979-81. The relative abundances of elements Zirconium through Neodymium (Z=60) are of particular interest because they are likely formed both by supernova explosions and by binary neutron star mergers. A well resolved measurement of this range of elements can constrain the contributions to the Galactic cosmic-ray composition from both of these possible sources.