The r-process production ratios of long-lived radionuclides

Details The r-process production ratios of long-lived radionuclides The r-process production ratios of long-lived radionuclides

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..214j&link_type=abstract

Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 214-221.

Astronomy and Astrophysics

Astrophysics

5

Actinide Series, Galactic Evolution, Nuclear Fusion, Radioactive Age Determination, Radioactive Isotopes, Rare Earth Elements, Abundance, Particle Production, Solar System, Uranium 235

Scientific paper

The r-process production ratios of Th-232, U-235, U-238, and Pu-244, and their uncertainties, are estimated without dependence on specific r-process models. The estimates are based on similarities between nuclei of the same nuclear type in the rare-earth and actinide regions. All actinide alpha-series progenitors are assumed to be equally produced, and the uncertainties in this estimate are derived from the rms fluctuations of observed rare-earth even-even isotopic abundances about their mean. It is shown, however, that the systematic odd-even effect in rare-earth abundances cannot be applied reliably to the actinide region. Production ratios involving U-235 are thus more uncertain than ratios between two even nuclides. The estimated production ratios and uncertainties are compared with previously published ones.

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