A search for supernova produced 244Pu in a marine sediment

Details A search for supernova produced 244Pu in a marine sediment A search for supernova produced 244Pu in a marine sediment

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007nimpb.259..673r&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 259, Issue 1, p. 673-676.

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Spectrometers And Spectroscopic Techniques, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments

Scientific paper

We describe here the chemical and AMS procedures that we have developed to look for 244Pu in marine sediments. This study was motivated by the report of Knie et al. [K. Knie, G. Korschinek, T. Faestermann, E.A. Dorfi, G. Rugel, A.Wallner, Phys. Rev. Lett. 93 (2004) 171103] for observation of 60Fe in a ferromanganese crust, which they have interpreted as resulting from the explosion of a supernova near the solar system ˜2.8 My ago. A novel aspect of the AMS procedure is the use of various Mo isotopes as “pilot” beams, which allow us to tune the machine for the various Pu isotopes, without the necessity of using enriched Pu standards, thus minimizing the risk of 244Pu contamination. These techniques have been tested on an IAEA marine sediment containing nuclear weapons contaminated 239Pu and then applied to an Indian Ocean sediment over the period 2.4 4.0 My.

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