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A: Fachverband Atomphysik

A 25: Ultra-cold plasmas and Rydberg systems II (joint session A/Q)

A 25.6: Vortrag

Donnerstag, 12. März 2020, 15:30–15:45, a320

Stimulated decay and formation of antihydrogen atoms (arXiv:1912.03163) — •Tim Wolz¹, Chloé Malbrunot¹, Lilian Nowak¹, Daniel Comparat², and Mélissa Vieille-Grosjean² — ¹Physics Department, CERN, Genève 23, 1211, Switzerland — ²Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Paris Saclay, Université Paris-Saclay, 91405 Orsay, France

Antihydrogen atoms (Hbar) are routinely formed at the Antiproton Decelerator at CERN in a wide range of Rydberg states. However, precision measurements for stringent tests of the CPT theorem as well as first direct measurements of Earth’s gravitational acceleration of antimatter require ground state (GS) atoms. Currently, experiments solely rely on spontaneous decay which so far only allowed for measurements in a neutral atom trap. We report on methods to stimulate the decay of the Rydberg atoms especially in the framework of a beam formation to extract the atoms into a field free region. We propose deexcitation schemes relying on E and B field mixing (applicable to a pulsed charge exchange Hbar production scheme) as well as THz and microwave mixing (applicable to a quasi continuous three body recombination Hbar production scheme). Both methods make use of a (visible) deexcitation laser. We obtain, in either case, close to unity ground state fractions within a few tens of microseconds. Combining such deexcitation methods with a stimulated radiative recombination allows for a direct formation of Hbar atoms in ground state. Finally, we report on first steps toward an experimental implementation of the proposed techniques.