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CRIS Measurements of Electron-Capture-Decay Isotopes: ^(37)Ar, ^(44)Ti, ^(49)V, ^(51)Cr, ^(55)Fe, and ^(57)Co

Wiedenbeck, M. E. and George, J. S. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and Davis, A. J. and Israel, M. H. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Yanasak, N. E. (2001) CRIS Measurements of Electron-Capture-Decay Isotopes: ^(37)Ar, ^(44)Ti, ^(49)V, ^(51)Cr, ^(55)Fe, and ^(57)Co. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.5. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 1675-1679.

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The secondary isotopes ^(37)Ar, ^(44)Ti, ^(49)V, ^(51)Cr, ^(55)Fe, and ^(57)Co decay only by electron capture, which occurs preferentially at the lower cosmic-ray energies, where electron attachment is more likely. Measurements of the abundances of these isotopes may reveal the interstellar energies of cosmic rays during propagation and whether reacceleration occurred. Stable secondary isotopes may also be used to examine energy dependence and reacceleration. The Cosmic Ray Isotope Spectrometer has detected large numbers of these nuclei at 100 - 500 MeV/nucleon during a time spanning solar minimum and solar maximum, allowing an additional study of solar modulation. This paper will discuss several subiron abundance ratios and the implications for reacceleration and solar modulation.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wiedenbeck, M. E.0000-0002-2825-3128
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
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
Stone, E. C.0000-0002-2010-5462
Additional Information:© Copernicus GmbH. This research was supported by the National Aeronautics and Space Administration at the California Institute of Technology (under grant NAG5-6912), the Goddard Space Flight Center, the Jet Propulsion Laboratory, and Washington University in St. Louis. One of us (S.M.N.) also wishes to acknowledge the support of the Mr. and Mrs. Spencer T. Olin Foundation.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-55
Record Number:CaltechAUTHORS:20150303-135509933
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55485
Deposited By: Deborah Miles
Deposited On:05 Mar 2015 04:07
Last Modified:09 Mar 2020 13:19

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