Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221.1026d&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, May 1, 1978, p. 1026-1031.
Astronomy and Astrophysics
Astrophysics
6
Abundance, Alpha Particles, Meteoritic Composition, Nuclear Fusion, Proton Irradiation, Solar System, Abnormalities, Aluminum, Astronomical Models, Calcium, Decay Rates, Granular Materials
Scientific paper
It 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.
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