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Comparison of Various Reconstruction Techniques for Line Projections

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Kontrym-Sznajd G., Samsel-Czekała M., Biasini M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 5
1429-1434
EN
The most effective and popular algorithms to reconstruct the three-dimensional electron-positron momentum density from the measurements of the two-dimensional angular correlation of annihilation radiation are based on the Fourier transform or polynomial expansion. We compare the efficacy of different methods in reconstructing the momentum density of the rare-earth based compounds ErGa_3, CeIn_3 and model profiles, presenting also our new filtering algorithm.
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f-Electron Behavior in Rare Earth Based Systems: Localization or Itinerancy?

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Biasini M., Rusz J., Ferro G., Czopnik A.
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EN
Measurement of the two-dimensional angular correlation of the electron-positron annihilation radiation complemented with ab initio calculations can provide decisive information about the character of the f-electrons in rare earth compounds. We provide examples of f-electron localized and f-electron itinerant systems, respectively. (i) In the case of the antiferromagnetic heavy fermion and superconductor CeIn_3 the multisheet Fermi surface, reconstructed from our measurements in the paramagnetic phase, agrees closely with the predictions of band structure calculations regarding the Ce 4f electrons as fully localized. (ii) On the other hand, our studies of the antiferromagnet actinide based UGa_3 in the paramagnetic phase, compared with calculations which include the effects due to the non-uniform positron density and the electron-positron correlations, produce a substantial evidence that an unconstrained 5f-electron itinerant description applies.
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