L SHELL IONIZATION CROSS SECTIONS IN RELATIVISTIC ATOMS BY SWIFT HEAVY IONS

A. M. P. MENDEZ; D. M. MITNIK; C. C. MONTANARI; U. SINGH, M. OSWAL, S. KUMAR, G. SINGH, D. MEHTA, K.P. SINGH, T. NANDI

CAEN

Congreso; 10th International Symposium on Swift Heavy Ions in Matter (SHIM) & 28th International Conference on Atomic Collisions in Solids (ICACS),; 2018

www.shim-icacs2018.org

We combine the SLPA fromalism [1] for inner shell ionization cross sections withrelativistic calculations for the wave functions and binding energies of the ground state oftargets such as Ta, W, Pt, Au, Pb, Bi, Th, and U. These calculations are performed byusing the HULLAC code package [2]. The detailed energy levels are computed using theRELAC code [3], which uses the parametric potential model. The SLPA inputs are theelectronic density and binding energies for each subshell, being very sensitive to the latters.A test of these results for the Li subshell ionization cross sections are the experimentalmeasurements of total L x-ray production cross sections by 3-5 MeV/u Si ions in different charged states performed using the15 UD Pelletron accelerator at the Inter-University Accelerator Centre of New Delhi. Details of the experimental setup are given in [4]. The convertion from L x-ray emission cross sections to ionization cross sections was perfromed using the multiple-hole fluorescence and Coster-Kronig yields tabulated in [4]. We also compare with the known ECUSAR and ECPSSR results [5], as shown in figure 1. As expected for very deep shells, the charge state of the ion is not relevant, the silicon bound electrons almost do not screened the interaction of the nucleous with the target L-shell electrons (see figure 2).AcknowledgementAuthors from Argentina acknowledge the support from CONICET, ANPCyT, andUniversidad de Buenos Aires. Authors from India acknowledge the support fromDepartment of Science and Technology (DST), New Delhi.References[1] Montanari et al, Radiat. Eff. Defects Solids 166, 338 (2011)[2] Bar-Shalom et al, J. Quant. Spect. Rad. Transf. 71, 169 (2001).[3] Klapisch, Comput. Phys. Commun. 2, 239 (1971).[4] Oswal et al, Nucl. Instr. Meth. B 416, 110 (2018)[5] Brandt and Lapicki, Phys. Rev. A. 23, 1717, (1981)