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Abundance measurements of Zn, Ga, Ge, & Se from the Cosmic Ray Isotope Spectrometer (Cris) experiment on the Advanced Composition Explorer (ACE) satellite

Binns, W. R. and Cummings, A. C. and Israel, M. H. and Leske, R. A. and Mewaldt, R. A. and de Nolfo, G. A. and von Rosenvinge, T. T. and Stone, E. C. and Wiedenbeck, M. E. (2009) Abundance measurements of Zn, Ga, Ge, & Se from the Cosmic Ray Isotope Spectrometer (Cris) experiment on the Advanced Composition Explorer (ACE) satellite. In: Proceedings of the 31st International Cosmic Ray Conference. Department of High Energy Physics, University of Lodz , Lodz, Poland.

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The cosmic ray elemental abundances of _(30)Zn, _(31)Ga, _(32)Ge, and _(34)Se provide important tests of the model of the OB-association origin of galactic cosmic rays that has resulted from previous ACE measurements of the neon and iron isotopes and which appears to be confirmed by elemental abundances of Zn, Ga, Ge, and Se measured by the balloon-borne Trans-Iron Galactic Element Recorder (TIGER). These ultra-heavy (Z≥30) nuclei are very rare and require an instrument with a large product of geometrical factor and exposure time. We have measured these abundances using the CRIS instrument, which has a geometrical factor of about 250 cm^2sr, on the NASA-ACE spacecraft. Over the 11+ years since launch in 1997 we have collected ∼400 nuclei with Z≥30 over the energy range of ∼150 to 600 MeV/nucleon. These measured abundances relative to iron are presented and compared with those from the TIGER and HEAO-3 experiments. Our measurements are in reasonable agreement with the TIGER results and are consistent with an OB association origin of galactic cosmic rays.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Cummings, A. C.0000-0002-3840-7696
Israel, M. H.0000-0002-8104-208X
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
de Nolfo, G. A.0000-0002-3677-074X
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:Copyright University of Łódź. Department of High Energy Astrophysics, 2010. This work was supported by NASA at Washington University (under grant NAG5-12929), Caltech, JPL, and GSFC.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2009-09
Record Number:CaltechAUTHORS:20150512-090444943
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57433
Deposited By: Deborah Miles
Deposited On:20 May 2015 02:20
Last Modified:09 Mar 2020 13:19

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