Rolling of Sensitive Target Foils Being Coated with Evaporated Metal Layers
The rolling of metallic targets which are sensitive to oxygen and moist air can be facilitated by evaporating thin shielding layers onto both sides of the original materials. The obtained sandwich layers are mostly very resistant against destructive oxidations. They can be rolled down to required thicknesses even without the use of inert gas systems. The protected target materials are easy to handle, and they can be stored safely for rather long periods of time.
In this way U targets of thicknesses between 0.8 and 15.3 mg-cm-2 were prepared being protected with coverings of Ni of about 0.7% in weight of the corresponding U foils. Targets of Pr, 1 4 2Nd, 143Nd, 1 4 4Nd, 1 4 6Nd, and 1 4 8Sm of a thickness of 3.5 mg•cm-2 were produced having coverings of Ti or Ni of 2.1 to 3.3% in weight of the target layers.
The preparation procedures for these kinds of metal sandwich layers are described. Some applications as targets in high intensity heavy ion bombardments with energies of up to 10 MeV/u of 4 8Ti, 2 0 8Pb, and 2 3 8U ions at the UNILAC of the GSI are mentioned.
KeywordsTarget Thickness Rolled Backing Lanthanide Element Metallic Target Sandwich Layer
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