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Plutonium ageing leads to the creation of decay products such as americium, uranium, helium, but also self-irradiation defects such as vacancies and interstitials. These self-irradiation defects can affect the properties of plutonium; as an example, swelling of PuGa or PuAl alloys has already been observed at room temperature. This work is devoted to the study of the effect of ageing on the magnetic susceptibility of pure and alloyed plutonium. An anomaly has been revealed at low temperature ( T < 75?K) for magnetic fields lower than 4.5 T. This anomaly decreases after heat treatment. A tentative explanation, based on results from molecular dynamics calculation in delta-plutonium is given to explain the origin of the anomaly.

Additional information

Authors: BACLET N, Commissariat a l'Energie Atomique (CEA), Is-sur-Tille (FR);DORMEVAL M, Commissariat a l'Energie Atomique (CEA), Is-sur-Tille (FR);POCHET P, Commissariat a l'Energie Atomique (CEA), Is-sur-Tille (FR);FOURNIER J-M, Universite Joseph Fourier, Saint Martin d'Herex (FR);WASTIN F ET AL, European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: An oral report given at: Actinides 2001 International Conference. Organised by: Japan Atomic Energy Research Institute and Atomic Energy Society of Japan. Held in: Hayama (JP), 4-11 November 2001.
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