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Experimental and computational comparative study of electron emission of thin carbon foils traversed by MeV protons and hydrogen atoms in frozen charge states

par Dubus, Alain ;Rosier, M.;Vidovic, Z.;Billebaud, Annick;Fallavier, Mireille;Kirsch, R.;Poizat, J.-C.;Remillieux, Joseph
Référence Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 135, 1-4, page (443-449)
Publication Publié, 1998-02

Article révisé par les pairs

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Résumé :

The secondary electron emission has been measured for 2 MeV H+ and for H0 projectiles passing through very thin carbon foils without charge changing. We have studied the statistics of the emission from both entrance and emergence surfaces. Simultaneously, Monte Carlo calculations have been performed for similar experimental conditions (500 keV < E < 2 MeV). Both experimental and theoretical distributions can be fitted adequately by Pólya distributions. The measured and calculated differences of the yields and of the distribution widths between the H+ and "transmitted" H0 cases are interpreted in terms of screening effects on the large impact parameter collisions with target electrons. © 1998 Elsevier Science B.V.