Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........3t&link_type=abstract
Ph.D. Thesis Washington Univ., Saint Louis, MO.
Astronomy and Astrophysics
Astrophysics
1
Abundance, Cosmic Rays, Energy Spectra, Astrophysics, Cobalt, Iron, Silicon
Scientific paper
Individual element abundances in the charge region equal to or less than Z equal to or less than 30 are derived from two balloon flights of a very large geometry (6.6 sq m ster) electronic detector. The quality of this experiment provided not only single charge resolution over the entire charge range, but also ample statistics to determine relative abundance for each element as a function of energy and atmospheric depth. Absolute energy spectra in the region 0.6 to 1.2 GeV/amu are derived for the reference elements Iron (Z = 26) and Silicon (Z = 14). Some of the unique results of this experiment include: the first measurement of Zinc (Z = 30) which can display a clearly resolved charge peak, a new upper limit on the Cobalt (Z = 27) abundance with significant astrophysical consequences, and an empirically derived correction for atmospheric interactions which significantly reduces the systematic uncertainty in the abundance of secondary elements at the top of the atmosphere.
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