HAL : in2p3-00175531, version 1
 Tenth International Conference on Accelerator Mass Spectrometry, Berkeley : États-Unis
 A search for supernova produced $^{244}$Pu in a marine sediment
 G. Raisbeck1, T. Tran1, D. Lunney1, C. Gaillard2, S. Goriely, C. Waelbroeck, F. Yiou1
 (2007)
 We describe here the chemical and AMS procedures that we have developed to look for $^{244}$Pu 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 $\sim$ 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 $^{244}$Pu contamination. These techniques have been tested on an IAEA marine sediment containing nuclear weapons contaminated $^{239}$Pu and then applied to an Indian Ocean sediment over the period 2.4–4.0 My.
 Thème(s) : Physique/Physique/Géophysique
 Mot(s)-clé(s) : Accelerator mass spectrometry – 244Pu – Supernova
 in2p3-00175531, version 1 http://hal.in2p3.fr/in2p3-00175531 oai:hal.in2p3.fr:in2p3-00175531 Contributeur : Béatrice Forrler <> Déposé pour le compte de : Clotilde GAILLARD <> Soumis le : Vendredi 28 Septembre 2007, 15:02:31 Dernière modification le : Dimanche 30 Septembre 2007, 20:02:56