Other
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvl..93q2501v&link_type=abstract
Physical Review Letters, vol. 93, Issue 17, id. 172501
Other
26
Lifetimes, 150<=A<=189
Scientific paper
The decay of 182Hf, now extinct, into stable 182W has developed into an important chronometer for studying early solar system processes such as the accretion and differentiation of planetesimals and the formation of the Earth and the Moon. The only 182Hf half-life measurements available were performed 40years ago and resulted in an imprecise half-life of (9±2)×106 yr. We redetermined the half-life by measuring the specific activity of 182Hf based on two independent methods, resulting in a value of t1/2(182Hf)=(8.90±0.09)×106 yr, in good agreement with the previous value, but with a 20 times smaller uncertainty. The greatly improved precision of this half-life now permits very precise intercalibration of the 182Hf 182W isotopic system with other chronometers.
Ahmad Ibrahim
Bichler Martin
Gehrke R. J.
Halliday Alex N.
Helmer Richard G.
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