New Measurements of the Isotopic Composition of Iron, Cobalt, and Nickel from the Cosmic Ray Isotope Spectrometer on ACE

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The isotopes of iron, cobalt, and nickel carry information important for understanding the origins of galactic cosmic rays. The imprint of the processes responsible for nucleosynthesis of the material is carried in the relative abundances of primary isotopes including ^54Fe, ^56Fe, ^58Fe, ^58Ni, ^60Ni, and ^62Ni. Mother--daughter pairs of electron-capture decay nuclides (specifically, ^59Ni--^59Co and ^57Co--^57Fe) provide measures of the time between nucleosynthesis and particle acceleration. The Cosmic Ray Isotope Spectrometer (CRIS), carried aboard the Advanced Composition Explorer (ACE) spacecraft launched in August 1997, is making high-resolution measurements of these and other cosmic ray isotopes with unprecedented statistical accuracy. We will present new measurements of Fe, Co, and Ni isotopic composition from CRIS, compare them with previous results, and discuss their implications for the origin of cosmic rays.

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