CaltechAUTHORS
  A Caltech Library Service

Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of ^(59)Ni and ^(59)Co

Wiedenbeck, M. E. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and Dougherty, B. L. and Hink, P. L. and Klarmann, J. and Leske, R. A. and Lijowski, M. and Mewaldt, R. A. and Stone, E. C. and Thayer, M. R. and von Rosenvinge, T. T. and Yanasak, N. E. (1999) Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of ^(59)Ni and ^(59)Co. Astrophysical Journal Letters, 523 (1). L61-L64. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20140902-132158815

[img]
Preview
PDF - Published Version
See Usage Policy.

95Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20140902-132158815

Abstract

Measurements of the abundances of cosmic-ray ^(59)Ni and ^(59)Co 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 ^(59)Ni to ^(59)Co has occurred, leading to the conclusion that a time longer than the 7.6 × 10^4 yr half-life of ^(59)Ni 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/312242 DOIArticle
http://iopscience.iop.org/1538-4357/523/1/L61/PublisherArticle
Alternate Title:Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of 59Ni and 59Co
Additional Information:© 1999 American Astronomical Society. Received 1999 February 26; accepted 1999 July 15; published 1999 August 18. We are grateful to the large group of dedicated individuals that contributed to the development of the CRIS instrument (listed in Stone et al. 1998). We thank W. R. Webber for providing new cross section estimates prior to publication. This research was supported by the National Aeronautics and Space Administration at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, the Goddard Space Flight Center, and Washington University and by the McDonnell Center for the Space Sciences at Washington University.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAG5-6912
JPLUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
Washington University McDonnell Center for the Space SciencesUNSPECIFIED
Subject Keywords:acceleration of particles—cosmic rays—nuclear reactions, nucleosynthesis, abundances—supernovae: general
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-52
Record Number:CaltechAUTHORS:20140902-132158815
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140902-132158815
Official Citation:Constraints on the Time Delay between Nucleosynthesis and Cosmic-Ray Acceleration from Observations of 59Ni and 59Co M. E. Wiedenbeck et al. 1999 ApJ 523 L61
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49121
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Sep 2014 16:08
Last Modified:22 Feb 2015 23:06

Repository Staff Only: item control page