IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
THEORETICAL DEVELOPMENTS FOR THE STOPPING POWER IN AN EXTENDED ENERGY RANGE
Autor/es:
C. C. MONTANARI; D. M. MITNIK; A. M. P. MENDEZ; J. E. MIRAGLIA
Lugar:
Caen
Reunión:
Congreso; 10th International Symposium on Swift Heavy Ions in Matter (SHIM) & 28th International Conference on Atomic Collisions in Solids (ICACS); 2018
Institución organizadora:
www.shim-icacs2018.org
Resumen:
We present full theoretical calculations for the stopping power of heavy charged projectiles in multi-electronic targets. We combine a recent non-perturbative model for the free electron gas [1] and the SLPA for the inner-shells [2]. We will show our recent results for stopping of antiprotons in C, Si and Al at low impact energy, and for protons in Al, Si, Ti, Ge, Pb in an extended energy region. We will also present recent calculations for Nb, Pd, Ag, Gd, Hf, Ta y Pt. These very heavy targets require solving the relativistic Dirac equation to obtain the wave functions and binding energies for the ground state. To this end, we used the HULLAC code package [3], which allows one to obtain accurate relativistic one-electron orbitals and multiconfiguration bound states and energies. The calculations are based on first-order perturbation theory with a central field, including the contribution from the Breit interaction and quantum electrodynamics corrections. The detailed energy levels are computed using the RELAC code [4]. This model consists in minimizing the first-order relativistic energy of a given set of configurations for a parametric analytical function for the screening charge distribution. Although this code was developed for solving highly charged ions, it can be successfully employed for neutral atoms, such as the ones presented here. The computed binding energies of the bound orbitals are compared with the experimental values in solid compiled by Williams [5].These results are combined with the SLPA to obtain the inner-shells contribution to the electronic stopping, which is the relevant contribution for energies above the stopping maximum. [1] Montanari and Miraglia, Phys.Rev.A 96, 012707 (2017)[2] Montanari et al, Phys. Rev. A 80, 012901 (2009)[3]Bar-Shalom et al, J. Quant. Spectrosc. Radiat. Transf. 71, 169 (2001)[4] Klapisch, Comput. Phys. Commun. 2, 239 (1971).[5] Williams, compilation of available data in http://xdb.lbl.gov/Section1/Sec_1-1.html