The effect of delayed fission in nucleo-cosmochronology

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmology, Galactic Evolution, Nuclear Fission, Nuclear Fusion, Radioactive Decay, Astronomical Models, Astrophysics, Heavy Nuclei, Neutron Stars, Nuclear Radiation Spectroscopy

Scientific paper

Recent calculations on the yield of beta-stable nucleides from thermo-nuclear reactions indicate that the beta-delayed fission will play an important role in the decay of very heavy neutron-rich nuclei far off the beta-stability line. After the r-process event, the heavy actinides beta decay to the line of beta-stability: in doing so, they pass through the same area as nucleides produced in man-made explosions and will therefore also have their number reduced by delayed fission. The effect of this fission dissipation on the production ratios of the chronometric pairs, U-238/Th-232, U-235/U-238, and Pu-244/Th-232 is investigated, and we show that the two latter pairs may have their ratios reduced by as much as 30-40% with respect to earlier estimates.

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