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The Isotopic Abundances of Galactic Cosmic Rays with Atomic Number 29 ≤ Z ≤ 38

Binns, W. R. and Wiedenbeck, M. E. and Rosenvinge, T. T. von and Israel, M. H. and Christian, E. R. and Cummings, A. C. and Nolfo, G. A. de and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. (2022) The Isotopic Abundances of Galactic Cosmic Rays with Atomic Number 29 ≤ Z ≤ 38. Astrophysical Journal, 936 (1). p. 13. ISSN 0004-637X. doi:10.3847/1538-4357/ac82e7.

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The Cosmic Ray Isotope Spectrometer (CRIS) on the Advanced Composition Explorer spacecraft has been operating successfully in a halo orbit about the L1 Lagrange point since late 1997. We report here the isotopic composition of the Galactic cosmic ray (GCR) elements with 29 ≤ Z ≤ 38 derived from more than 20 years of CRIS data. Using a model of cosmic-ray transport in the Galaxy and the solar system (SS), we have derived from these observations the isotopic composition of the accelerated material at the GCR source (GCRS). Comparison of the isotopic fractions of these elements in the GCRS with corresponding fractions in the solar system gives no indication of GCRS enrichment in r-process isotopes. Since a large fraction of core-collapse supernovae (CCSNe) occur in OB associations, the fact that GCRs do not contain enhanced abundances of r-process nuclides indicates that CCSNe are not the principal source of lighter (Z ≤ 38) r-process nuclides in the solar system. This conclusion supports recent work that points to binary neutron-star mergers, rather than supernovae, as the principal source of galactic r-process isotopes.

Item Type:Article
Related URLs:
URLURL TypeDescription Article
Binns, W. R.0000-0001-6110-3407
Wiedenbeck, M. E.0000-0002-2825-3128
Rosenvinge, T. T. von0000-0001-7320-4141
Israel, M. H.0000-0002-8104-208X
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Nolfo, G. A. de0000-0002-3677-074X
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:NASA grant Nos. NNX08AI11G, NNX13AH66G, and 80NSSC18K0223 supported the work at the California Institute of Technology, the Jet Propulsion Laboratory, and Washington University in St. Louis. The work at Goddard Space Flight Center was funded by NASA through the ACE project.
Funding AgencyGrant Number
NASA ∣ GSFC ∣ Astrophysics Science DivisionNNX08AI11G
NASA ∣ GSFC ∣ Astrophysics Science DivisionNNX13AH66G
NASA ∣ GSFC ∣ Astrophysics Science Division80NSSC18K0223
Issue or Number:1
Record Number:CaltechAUTHORS:20220908-184327219
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116659
Deposited By: Donna Wrublewski
Deposited On:07 Sep 2022 22:33
Last Modified:08 Sep 2022 18:44

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