Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Precision spectroscopy of atoms and ions III (with A)
Q 24.1: Vortrag
Dienstag, 18. März 2014, 14:00–14:15, BEBEL SR140/142
The Baryon-Antibaryon Symmetry Experiment (BASE) — •Kurt Franke1,2, Christian Smorra2, Andreas Mooser3, Hiroki Nagahama2,4, Georg Schneider2,3, Klaus Blaum1, Yasuyuki Matsuda4, Christian Ospelkaus5, Wolfgang Quint6, Jochen Walz3, Yasunori Yamazaki7, and Stefan Ulmer2 — 1MPI-K, Heidelberg, Germany — 2RIKEN Ulmer IRU, Japan — 3Universität Mainz, Germany — 4University of Tokyo, Japan — 5Universität Hannover, Germany — 6GSI Darmstadt, Germany — 7RIKEN APL, Japan
BASE is a multinational collaboration currently building an apparatus at the Antiproton Decelerator (AD) of CERN to make comparison measurements of antiproton and proton magnetic g-factors. Such comparisons are interesting because any measured asymmetry would hint at physics beyond the Standard Model.
The experiment consists of measuring the cyclotron and Larmor frequencies, νc and νL, of a single trapped (anti)proton, with the g-factor given by 2νL/νc. Determination of νc is by measurement of the three motional eigenfrequencies in the precision trap, a Penning trap with highly homogeneous magnetic field. The measurement of νL requires tracing out the spin flip resonance curve which further requires a second Penning trap—the so-called analysis trap—to measure the spin state. These two Penning traps form the heart of the experiment. Additional subsystems include systems for trapping and storing antiprotons, cryogenics, and low-noise electronics. We will present an overview of the BASE project and the current status.