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Cosmic-Ray Sources and Source Composition

Tsao, C. H. and Silberberg, A. F. and Barghouty, A. F. (2001) Cosmic-Ray Sources and Source Composition. Astrophysical Journal, 549 (1). pp. 320-324. ISSN 0004-637X. doi:10.1086/319059.

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Present data on cosmic-ray elemental and isotopic relative abundances are shown to be unable to distinguish between various models of cosmic-ray sources and their composition. For example, the model of freshly nucleosynthesized material from supernova explosions as the cosmic-ray source is unable to account for some measured, key cosmic-ray elemental abundances. This and two other models are evaluated here in light of recent isotopic and elemental measurements. It is shown that model-dependent preferential injection, acceleration, and reacceleration do not allow a clear distinction of one model against the others. Future measurements of critical elements and isotopes are suggested, which should afford us the ability to do that. We base our suggestions on measurements and a quantitative comparison between the predictions of the standard leaky-box model for the Galactic propagation of cosmic rays and one in which reacceleration is taken into account.

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Additional Information:© 2001. The American Astronomical Society. Received 2000 June 9, accepted for publication 2000 October 31. This work has been supported by NASA grant NAG5-5165 and by NSF grant 98-10653 and NASA-JOVE grant NAG 8-1208 (A. F. B.). R. S. thanks J.-P. Meyer for valuable correspondence. The authors thank the Naval Research Laboratory for use of their computing facilities.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2001-08
Issue or Number:1
Record Number:CaltechAUTHORS:20150226-143938276
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55272
Deposited By: Deborah Miles
Deposited On:27 Feb 2015 02:44
Last Modified:10 Nov 2021 20:44

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