Oberseminar, WS15/16

Abstract

Abstract

A study of anti-hydrogen atoms is very important for fundamental physics. In the experiments in CERN [1] anti-hydrogen atoms are created by mixing of cold antiprotons and positrons in magnetic trap. We have made theoretical studies of the relaxation processes in the presence of strong magnetic field (1-3 Tesla) using molecular dynamics technique [2]. The calculated de-acceleration rates are different for particles with velocities which parallel and perpendicular to the applied magnetic field. The creation of anti-hydrogen atoms can occur under condition when parallel velocities of the particles are still high. It may limit the production of trapped anti-hydrogen atoms in the existing experimental arrangements. In order to increase the number of trapped anti-hydrogen atoms the optical cooling methods can be used. We suggest perform experimental simulations of anti-hydrogen trapping with MOT for lithium atoms. As the first step we have studied of highly-excited states of ultracold lithium-7 atoms by using tunable UV-laser. The diagnostic of Rydberg transitions of lithium atoms in MOT is developed [3]. In our work the results for different Rydberg states nS, nP, nD, nF with quantum number n from 38 to 161 will be presented. In future a modified trap for anti-hydrogen atoms will be assembled at facilities of An International Facility for Antiproton and Ion Research (FAIR). The work was supported by Research Center FAIR (FAIR, Russia).

References
[1] G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz, et al. Nature 468, 673 (2010).
[2] A. A. Bobrov, S. Ya. Bronin, B . B. Zelener, et al. JETP 14, 185 (2013).
[3] B . B. Zelener, S.A. Saakyan, V.A. Sautenkov, et al. JETP, 148, 5 (2015).