Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newar..48..161v&link_type=abstract
New Astronomy Reviews, Volume 48, Issue 1-4, p. 161-164.
Astronomy and Astrophysics
Astronomy
7
Accelerator Mass Spectrometry, Extinct Radioactivities, 182Hf, Ism
Scientific paper
The presence of live 182Hf (t1/2~9 Myr) in the early solar system is well established but the understanding of its abundance is still challenging. Live 182Hf is expected to be present in the interstellar medium (ISM) as a result of recent nucleosynthesis activity. We are attempting a search for live 182Hf possibly deposited on Earth. The search focuses on deep-ocean sediments and a method for chemical extraction of the Zr-Hf fraction from sediments has been developed. The detection of 182Hf is performed at the Vienna Environmental Research Accelerator (VERA). Measurements of Hf and W isotopic abundances for the Zr-Hf fraction extracted from deep-sea sediment samples were performed. Present limits for the 182Hf abundance derived from the measured isotopic abundances are discussed.
Bichler Martin
Feldstein C.
Golser Robin
Kutschera Walter
Paul Mark
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