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Proton-associated alpha-irradiation in the early solar system - A possible K-41 anomalyIt is shown that alpha-particle fluences associated with proton fluences sufficiently high to produce the Al-correlated excess of Mg-26 found in the Allende meteorite produce equally significant amounts of Ca-41. The Ca-41 is produced by Ar-38(alpha,n)Ca-41 reactions occurring in the gas and condenses into the Ca-Al-rich grains forming at that time. After the decay of Ca-41, these grains will have a Ca-correlated excess of K-41. The question is considered whether the proposed scheme is capable of producing an observable excess of K-41. A calculation is conducted of the magnitude of the K-41 excess expected to be found in Ca-Al-rich grains for various ratios of Ca/K by developing an irradiation-condensation model. It is shown that on the basis of the currently available data it is not possible to come to firm conclusions regarding the validity of the irradiation model.
Document ID
19780050053
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dwek, E.
(Rice University Houston, Tex.; California Institute of Technology, Pasadena, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
May 1, 1978
Publication Information
Publication: Astrophysical Journal
Subject Category
Lunar And Planetary Exploration
Accession Number
78A33962
Funding Number(s)
CONTRACT_GRANT: NSF PHY-76-83685
CONTRACT_GRANT: NSG-7015
Distribution Limits
Public
Copyright
Other

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