Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..162t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 162-169.
Astronomy and Astrophysics
Astrophysics
31
Chronology, Galactic Evolution, Milky Way Galaxy, Neutron Emission, Nuclear Fission, Nuclear Fusion, Plutonium 244, Thorium, Uranium 235, Uranium 238
Scientific paper
The production ratios of the actinide chronometers Th-232/U-238, U-235/U-238, and Pu-244/U-238 are calculated by applying new predictions for beta-delayed fusion and neutron emission in an r-process calculation. The respective production ratios for these chronometers are 1.39, 1.24, and 0.12, leading to a galactic age of 20.8 billion plus 2 billion or minus 4 billion years when applying an exponential model of galactic nucleosynthesis. This value is larger than predictions by the independent chronometers Re-187/Os-187 and Lu-176; consistency is attained, however, when the slower exponential decrease of the galactic nucleosynthesis production from this work is taken into account. The new value is in agreement with recent astronomical observations from globular clusters and a Hubble constant of 60 km/s/Mpc or less for a Friedmann model with cosmological constant of zero.
Klapdor Hans Volker
Metzinger J.
Thielemann Friederich-Karl
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