STOPPING POWER OF IONS IN SOLIDS: CURRENT INTEREST, DATA NEEDS AND NEW THEORETICAL RESULTS,

A. M. P. MENDEZ; D. M. MITNIK; C. C. MONTANARI; J. E. MIRAGLIA

Antibes

Congreso; 24th International Conference on Ion Beam Analysis; 2019

Societe Francaise du Vide

The present state of the energy loss of ions in solids will be talked over, based on themanagement of the IAEA stopping database [1]: experimental trends of the last years, lackof values, uncertainties, interest and difficulties of rare earths and post-lanthanide targets.The theoretical challenge of describing the stopping power of the very heavy elements(those whose 4f shell of electrons plays a major role) will be introduced, and new theoreticalresults presented in an energy range that covers from very low to the tens of MeV. Anexample of these results is shown in Figure 1, where we display the electronic stoppingcross section of Tantalum for protons. The experimental data is from [1], the curvescorrespond to our nonperturbative and perturbative calculations as explained in [2]. Alsoincluded is the SRIM curve [3]. A peculiar behavior of the 4f electrons at very low energies,already noted experimentally in [4] will also be discussed.