Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 21: Precision spectroscopy of atoms and ions III (with Q)

A 21.1: Talk

Tuesday, March 18, 2014, 14:00–14:15, BEBEL SR140/142

The Baryon-Antibaryon Symmetry Experiment (BASE) — •Kurt Franke^1,2, Christian Smorra², Andreas Mooser³, Hiroki Nagahama^2,4, Georg Schneider^2,3, 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, ν_c and ν_L, of a single trapped (anti)proton, with the g-factor given by 2ν_L/ν_c. Determination of ν_c is by measurement of the three motional eigenfrequencies in the precision trap, a Penning trap with highly homogeneous magnetic field. The measurement of ν_L 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.