Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of ^59NI and ^59CO

Details Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of ^59NI and ^59CO Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of ^59NI and ^59CO

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523l..61w&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 1, pp. L61-L64.

Astronomy and Astrophysics

Astronomy

45

Acceleration Of Particles, Ism: Cosmic Rays, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General

Scientific paper

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 7.6x10^4 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 ~10^5 yr has elapsed.

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