Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nimpb.172..333w&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section B, Volume 172, Issue 1-4, p. 333-337.
Physics
11
Scientific paper
For a search of supernova-produced actinide atoms in terrestrial archives, techniques for measuring minute amounts of atoms of actinides with AMS have been developed at the Munich tandem accelerator laboratory. A large analyzing magnet has been installed, able to bend even the heavy transuranic ions at the high energies achievable with our MP tandem. The final detector is a time-of-flight and a multiple energy loss measurement which allows a nearly background-free detection of individual actinides like 244Pu. An efficient chemical preparation method has been developed for the extraction of small amounts of plutonium from samples up to nearly 1 kg. Furthermore, the preparation of sputter cathodes, containing the final sample material, was optimized for high yields of negative molecules in the Cs-sputter ion source. The first search for supernova-originated 244Pu in a deep sea ferromanganese crust has already been carried out.
Faestermann Th.
Gerstmann Uwe
Hillebrandt Wolfgang
Knie Klaus
Korschinek Gunther
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