Statistics
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..apr.p7003d&link_type=abstract
American Physical Society, APS April Meeting, April 22-26, 2006, abstract #P7.003
Statistics
Scientific paper
The Trans-Iron Galactic Element Recorder (TIGER) has completed two successful Antarctic flights in December/January of 2001 and 2003. TIGER was designed to observe elements in galactic cosmic rays (GCR) ranging from 14 <= Z <= 40 over an extended energy range. Observations of the isotopes of Co and Ni at low energies, in particular, the observation of ^59Ni and ^59Co from the Cosmic Ray Isotope Spectrometer on Advanced Composition Explorer, indicate that a significant time delay (>7.6x10^4 yr) exists between nucleosynthesis and acceleration of GCRs. While TIGER is not able to resolve isotopes, observations of the elemental abundance of Co and Ni at energies higher than CRIS/ACE further constrain models for GCR acceleration and propagation. With a 2001 flight of nearly 32 days, TIGER collected sufficient statistics to study the Co/Ni elemental ratio over a wide range in energy from ˜0.8-5 GeV/nucleon. We present the Co/Ni ratio observed from TIGER's first successful Antarctic flight in 2001 and compare these results with previous observations and with the predictions from GCR propagation models.
Barbier Loius M.
Binns Robert W.
Cummings Jay R.
de Nolfo Georgia Adair
Geier Stephan
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