Total stopping and its straggling for protons in heavy targets, fully relativistic calculations for Au, Pb and Bi

C. C MONTANARI; C. D. ARCHUBI; D. M. MITNIK; J. E. MIRAGLIA

Phalaborwa, Sudáfrica

Congreso; 23 International Conference on Atomic Collisions in Solids (ICACS); 2008

Local organizers of the 23 International Conference on Atomic Collisions in Solids

The total stopping power and its straggling is calculated for protons in heavy ions. For the atomic structure calculations we combine the fully-relativistic solutions of the Dirac equation with the Levine-Louie Shellwise Local Plasma Approximation (SLPA).  The valence electron contribution is considered as that of a free electron gas employing the Mermin-Lindhard dielectric function to take into account collective or plasmon excitations.  The fully-relativistic wave functions and their binding energies are introduced within the SLPA for the inner shell contribution to the stopping power. The SLPA employees a shell to shell dielectric response with the Levine-Louie correction to take into account the ionization threshold of each shell.  This description considers linear response and square dependence with the ion charge. It is a perturbative approximation valid in the intermediate to high energy range. Previous calculations (for atoms with atomic number Z