Constraints on the time delay between nucleosynthesis and cosmic-ray acceleration from observations of 59Ni and 59Co

M. E. Wiedenbeck, W. R. Binns, E. R. Christian, A. C. Cummings, B. L. Dougherty, P. L. Hink, J. Klarmann, R. A. Leske, M. Lijowski, R. A. Mewaldt, E. C. Stone, M. R. Thayer, T. T. Von Rosenvinge, Nathan Eugene Yanasak

Research output: Contribution to journalArticle

77 Scopus citations

Abstract

Measurements of the abundances of cosmic-ray 59Ni and 59Co are reported from the Cosmic-Ray Isotope Spectrometer (CRIS) on the Advanced Composition Explorer. These nuclides form a parent-daughter pair in a radioactive decay which can occur only by electron capture. This decay cannot occur once the nuclei are accelerated to high energies and stripped of their electrons. The CRIS data indicate that the decay Of 59Ni to 59Co has occurred, leading to the conclusion that a time longer than the 7.6 x 104 yr half-life of 59Ni elapsed before the particles were accelerated. Such long delays indicate the acceleration of old, stellar or interstellar material rather than fresh supernova ejecta. For cosmic-ray source material to have the composition of supernova ejecta would require that these ejecta not undergo significant mixing with normal interstellar gas before ≃105 yr has elapsed.

Original languageEnglish (US)
Pages (from-to)L61-L64
JournalAstrophysical Journal
Volume523
Issue number1 PART 2
StatePublished - Sep 20 1999
Externally publishedYes

Keywords

  • Acceleration of particles
  • Cosmic rays
  • Nuclear reactions, nucleosynthesis, abundances
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Wiedenbeck, M. E., Binns, W. R., Christian, E. R., Cummings, A. C., Dougherty, B. L., Hink, P. L., Klarmann, J., Leske, R. A., Lijowski, M., Mewaldt, R. A., Stone, E. C., Thayer, M. R., Von Rosenvinge, T. T., & Yanasak, N. E. (1999). Constraints on the time delay between nucleosynthesis and cosmic-ray acceleration from observations of 59Ni and 59Co. Astrophysical Journal, 523(1 PART 2), L61-L64.