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The Heavy Nuclei eXplorer (HNX) Mission

Binns, W. R. and Adams, J. H., Jr. and Barbieri, M. and Christian, E. R. and Craig, N. and Cummings, A. C. and Cummings, J. R. and Doke, T. and Hasebe, N. and Hayashe, T. and Israel, M. H. and Lee, D. and Leske, R. A. and Mark, D. and Mewaldt, R. A. and Mitchell, J. W. and Ogura, K. and Schindler, S. M. and Stone, E. C. and Tarle, G. and Tawara, H. and Waddington, C. J. and Westphal, A. J. and Wiedenbeck, M. E. and Yasuda, N. (2001) The Heavy Nuclei eXplorer (HNX) Mission. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.6. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 2181-2185.

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The primary scientific objectives of HNX, which was recently selected by NASA for a Small Explorer (SMEX) Mission Concept Study, are to measure the age of the galactic cosmic rays (GCR) since nucleosynthesis, determine the injection mechanism for the GCR accelerator (Volatility or FIP), and study the mix of nucleosynthetic processes that contribute to the source of GCRs. The experimental goal of HNX is to measure the elemental abundances of all individual stable nuclei from neon through the actinides and possibly beyond. HNX is composed of two instruments: ECCO, which measures elemental abundances of nuclei with Z≥72, and ENTICE, which measures elemental abundances of nuclei with 10≤Z≤82. We describe the mission and the science that can be addressed by HNX. 1. Introduction The Heavy Nuclei eXplorer (HNX) mission that is currently being studied as a possible Small Explorer Mission (SMEX) has the primary objective of determining the origin of the galactic cosmic rays. The abundance patterns of the elements and isotopes in the GCRs provide the key because they are the fingerprints of GCR origin. HNX will, for the first time, measure with high precision the abundance of every individual element in the periodic table from neon through the actinides (thorium, uranium, plutonium, curium, and perhaps beyond). The HNX spacecraft will carry two high-precision instruments, the Extremely-heavy Cosmic-ray Composition Observer (ECCO) and the ENergetic Trans-Iron Composition Experiment (ENTICE), which cover overlapping ranges of the periodic table (Figure 1).

Item Type:Book Section
Related URLs:
URLURL TypeDescription
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
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© Copernicus GmbH. This research was supported in part by the National Aeronautics and Space Administration under grant NAGS- 10802 and by the McDonnell Center for the Space Sciences at Washington University.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2001-23
Record Number:CaltechAUTHORS:20150302-135738779
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55426
Deposited By: Deborah Miles
Deposited On:04 Mar 2015 17:55
Last Modified:09 Mar 2020 13:19

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