Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1686440 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2006 | 5 Pages |
Abstract
An extension of the Brandt-Kitagawa model for the effective charge calculation is presented in the case of ions with atomic numbers from Z1Â =Â 3 to 10. The Hartree-Fock method is used to provide electronic densities for projectiles with various charge states. The projectile screening lengths obtained using the Hartree-Fock method are larger than those calculated using the variational method as proposed in the Brandt-Kitagawa model. Differences between the effective charge calculated by the original method and the one presented here can be as high as 50% especially in the case of low charge states. With this alternative procedure, it is possible to input projectile shell effects in the stopping power such as Z1-oscillations. The differences between the present method and the original one are attributed to a poor description of the heavy ion screening length by the variational method assumed in the Brandt-Kitagawa model.
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Authors
J.A.M. Pereira,