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 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 survived. This conclusion is in conflict with the clear evidence from ACE/CRIS below 0.5 GeV/nucleon that there is negligible surviving at the source. Possible explanations for this apparent discrepancy are discussed.
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15 September 2000
ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium
5-8 January 2000
Indian Wells,California (USA)
Research Article|
September 15 2000
Co/Ni element ratio in the galactic cosmic rays between 0.8 and 4.3 GeV/nucleon
S. H. Sposato;
S. H. Sposato
1Department of Physics & McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130
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L. M. Barbier;
L. M. Barbier
2Laboratory for High Energy Astrophysics, Goddard Space Flight Center, Greenbelt, Maryland 20771
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W. R. Binns;
W. R. Binns
1Department of Physics & McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130
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E. R. Christian;
E. R. Christian
2Laboratory for High Energy Astrophysics, Goddard Space Flight Center, Greenbelt, Maryland 20771
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J. R. Cummings;
J. R. Cummings
1Department of Physics & McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130
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G. A. deNolfo;
G. A. deNolfo
3Space Radiation Laboratory, California Institute of Technology, Pasadena, California 91125
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P. L. Hink;
P. L. Hink
1Department of Physics & McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130
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M. H. Israel;
M. H. Israel
1Department of Physics & McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130
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R. A. Mewaldt;
R. A. Mewaldt
3Space Radiation Laboratory, California Institute of Technology, Pasadena, California 91125
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J. W. Mitchell;
J. W. Mitchell
2Laboratory for High Energy Astrophysics, Goddard Space Flight Center, Greenbelt, Maryland 20771
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S. M. Schindler;
S. M. Schindler
3Space Radiation Laboratory, California Institute of Technology, Pasadena, California 91125
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R. E. Streitmatter;
R. E. Streitmatter
2Laboratory for High Energy Astrophysics, Goddard Space Flight Center, Greenbelt, Maryland 20771
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C. J. Waddington
C. J. Waddington
4School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455
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AIP Conf. Proc. 528, 433–436 (2000)
Citation
S. H. Sposato, L. M. Barbier, W. R. Binns, E. R. Christian, J. R. Cummings, G. A. deNolfo, P. L. Hink, M. H. Israel, R. A. Mewaldt, J. W. Mitchell, S. M. Schindler, R. E. Streitmatter, C. J. Waddington; Co/Ni element ratio in the galactic cosmic rays between 0.8 and 4.3 GeV/nucleon. AIP Conf. Proc. 15 September 2000; 528 (1): 433–436. https://doi.org/10.1063/1.1324354
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