Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Precision spectroscopy of atoms and ions I (with Q)

A 2.1: Vortrag

Montag, 18. März 2013, 11:00–11:15, B 302

Progress Towards Antihydrogen Hyperfine Spectroscopy — •Stefan Ulmer — RIKEN Advanced Science Institute, Hirosawa,Wako, Saitama 351-0198, Japan — on behalf of the ASACUSA-CUSP collaboration

The CUSP experiment at the CERN Antiproton Decelerator (AD) is a part of the ASACUSA physics program. It is dedicated to perform precise hyperfine spectroscopy of antihydrogen. A comparison to the hydrogen hyperfine structure provides a sensitive test of matter/ antimatter symmetry. Mixing antiprotons with positrons in a so-called nested trap scheme, antihydrogen is produced. The mixing takes place in the cusp (anti-Helmholz) magnet, which acts as well as a unique spin polarization filter. Transmitted low-field seeking hyperfine states pass a radio frequency spin-flip cavity followed by a sextupole analyser and an antihydrogen detector. A measurement of the antihydrogen signal as a function of the frequency irradiated to the cavity gives direct access to the hyperfine structure. The status of this Rabi-like antiatomic spectroscopy experiment will be reported.