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

ORAL

Abstract

The SuperTIGER (Trans-Iron Galactic Element Recorder) instrument was launched from Williams Field, Antarctica on December 8, 2012 and flew for 55 days on a long-duration balloon at 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 in the charge range Z$=$10-40. SuperTIGER also made exploratory measurements of the relative abundances up to Z$=$56. Although the statistics are low for charges greater than Z$=$40, we will show how the relative abundances of charges Z$=$40-56 compare to those reported by HEAO3-HNE. The charge range Z$=$40-60 is of particular interest because these elements are formed both in supernova explosions and in binary neutron star mergers. A well resolved relative abundance measurement of these elements can show us how much these astrophysical events contribute to the composition of the Galactic cosmic-rays.

*This work was supported by NASA under grants NNX09AC17G, NNX09AC18G, NNX14AB24G, NNX14AB25G, and NNX15AC15G, by the Peggy and Steve Fossett Foundation, and by the McDonnell Center for the Space Sciences at Washington University in St. Louis.

–

Authors

  • Nathan Walsh

    • Washington University

  • Walter Binns

    • Washington University

  • Martin Israel

    • Washington University

  • Ryan Murphy

    • Washington University

  • Brian Rauch

    • Washington University

  • John Ward

    • Washington University

  • Terri Brandt

    • NASA Goddard Space Flight Center

  • Jason Link

    • NASA Goddard Space Flight Center

  • John Mitchell

    • NASA Goddard Space Flight Center

  • Thomas Hams

    • NASA Goddard Space Flight Center

  • Kenichi Sakai

    • NASA Goddard Space Flight Center

  • Makoto Sasaki

    • NASA Goddard Space Flight Center

  • Allan Labrador

    • California Institute of Technology

  • Richard Mewaldt

    • California Institute of Technology

  • Edward Stone

    • California Institute of Technology

  • Mark Wiedenbeck

    • Jet Propulsion Laboratory

  • Cecil Waddington

    • University of Minnesota