The Origin of Primary Cosmic Rays: Constraints from ACE Elemental and Isotopic Composition Observations期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The Origin of Primary Cosmic Rays: Constraints from ACE Elemental and Isotopic Composition Observations

Authors:	ME Wiedenbeck NE Yanasak AC Cummings AJ Davis JS George RA Leske RA Mewaldt EC Stone PL Hink MH Israel M Lijowski ER Christian TT von Rosenvinge

Institution:	(1) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, U.S.A;(2) California Institute of Technology, Pasadena, CA, 91125, U.S.A;(3) Washington University, St. Louis, MO, 63130, U.S.A;(4) MD 20771, U.S.A

Abstract:	Cosmic-ray isotope observations from NASAs Advanced Composition Explorer (ACE) mission have been used to investigate the composition of cosmic-ray source material. Source abundances relative to ⁵⁶Fe are reported for eleven isotopes of Ca, Fe, Co, and Ni, including the very rare isotopes ⁴⁸Ca and ⁶⁴Ni. Although the source abundances range over a factor 10⁴, most of the ratios to ⁵⁶Fe are consistent with solar-system values to within 20%. However, there are some notable differences, the most significant being an excess of (70±30)% relative to the solar system for the cosmic-ray source ratio ⁵⁸Fe/⁵⁶Fe. The possible association of such an excess with a contribution to the cosmic-ray source from Wolf–Rayet star ejecta is discussed.

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