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Co/Ni element ratio in the galactic cosmic rays between 0.8 and 4.3 GeV/nucleon

Sposato, S. H. and Barbier, L. M. and Binns, W. R. and Christian, E. R. and Cummings, J. R. and deNolfo, G. A. and Hink, P. L. and Israel, M. H. and Mewaldt, R. A. and Mitchell, J. W. and Schindler, S. M. and Streitmatter, R. E. and Waddington, C. J. (2000) Co/Ni element ratio in the galactic cosmic rays between 0.8 and 4.3 GeV/nucleon. In: Acceleration and Transport of Energetic Particles Observed in the Heliosphere: ACE 2000 Symposium, Indian Wells, CA, 5-8 January 2000. American Institute of Physics Conference Proceedings. No.528. American Institute of Physics , Melville, NY, pp. 433-436. ISBN 1-56396-951-3.

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In a one-day balloon flight of the Trans-Iron Galactic Element Recorder (TIGER) in 1997, the instrument achieved excellent charge resolution for elements near the Fe peak, permitting a new measurement of the element ratio Co/Ni. The best fit to the data, extrapolated to the top of the atmosphere, gives an upper limit for this ratio of 0.093±0.037 over the energy interval 0.8 to 4.3 GeV/nucleon; because a Co peak is not seen in the data, this result is given as an upper limit. Comparing this upper limit with calculations by Webber & Gupta suggests that at the source of these cosmic rays a substantial amount of the electron-capture isotope 59Ni survived. This conclusion is in conflict with the clear evidence from ACE/CRIS below 0.5 GeV/nucleon that there is negligible 59Ni surviving at the source. Possible explanations for this apparent discrepancy are discussed.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
Israel, M. H.0000-0002-8104-208X
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:©2000 American Institute of Physics. Issue Date: September 15, 2000. This work was supported in part by NASA under grant NAG5-5110.
Group:Space Radiation Laboratory
Subject Keywords:galactic cosmic rays, cosmic ray composition, element relative abundance, high-energy cosmic ray interactions, nucleosynthesis, nuclear electron capture, cosmic ray energy spectra
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2000-35
Series Name:American Institute of Physics Conference Proceedings
Issue or Number:528
Record Number:CaltechAUTHORS:SPOaipcp00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9771
Deposited By: Archive Administrator
Deposited On:14 Mar 2008
Last Modified:08 Nov 2021 21:02

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