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Communication Dans Un Congrès Année : 2008

Convolution approximation for the energy loss, ionization probability and straggling of fast ions

P.L. Grande
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  • PersonId : 849397
G. Schiwietz
  • Fonction : Auteur
  • PersonId : 849398

Résumé

In this work we describe an extension of the convolution approximation for the ionization probability, energy loss and straggling as a function of the impact parameter for swift ions. Simple formulas for these quantities are derived and compared to full first-order calculations. The physical inputs of the model are the electron density and oscillators strengths of the target as well as the screening function of the projectile (in the case of dressed ions). A very good agreement is obtained for all impact parameters. In addition, we propose a general schema to add contributions from distant and close collisions. In this way physical processes arising from large and small impact-parameters can be easily included into a single expression valid for all impact parameters.
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Dates et versions

hal-00207509 , version 1 (28-07-2008)

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  • HAL Id : hal-00207509 , version 1

Citer

P.L. Grande, G. Schiwietz. Convolution approximation for the energy loss, ionization probability and straggling of fast ions. The Seventh International Symposium on Swift Heavy Ions in Matter, Jun 2008, Lyon, France. ⟨hal-00207509⟩

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