In a paper just published in Nature we report on the first direct high precision measurement of the proton magnetic moment. By application of the elegant double Penning trap technique we achieved a fractional precision of 3.3 parts per billion. Our value is consistent with the currently accepted CODATA value, but 2.5 times more precise.
Congratulations, BASE member Dr. Christian Smorra applied successfully for one of the highly competitive CERN fellowships. We are thankful for the very strong support by CERN.
In a just in Physics Letters B published article we report on the first successful demonstration of the double Penning trap technique with a single proton. This is a major step towards a measurement of the particle's magnetic moment with ppb precision. The method can be applied to the antiproton, which will enable one of the most sensitive tests of CPT symmetry with baryons.
In today's Research Board meeting the BASE project was approved. CERN supported the approval by an article in the CERN bulletin.
The BASE technical design report was evaluated by the SPSC. The committee recommended approval of the BASE project to the research board. Our TDR contains a detailed description of our experiment and a feasibility study for implementation of BASE into the Antiproton Decelerator facility. We acknowledge the strong support of the CERN groups which contributed to to this study.Special thanks to Lajos Bojtar for the coordination.
In a just in Physical Review Letters published article we report on the first detection of single spin-flips of a single proton. We use Bayesian analysis methods and obtain spin state detection fidelities close to 100%. This is a major step towards the application of the so-called double Penning-trap method to measure magnetic moments of both the proton and the antiproton with ppb precision.
The BASE Letter of Intent was welcomed by the CERN SPSC. We are invited to submit a technical design report, discussing the feasibility to implement our apparatus into the infrastructure of the Antiproton Decelerator facility.
We just published a review article which gives detailed insight into the proton g-factor experiment at Mainz. The article contains as well a low resolution measurement of the proton magnetic moment it a fractional precision of 8.9 ppm.
Penning traps are extremely powerful and versatile tools for high precision physics. This enormous impact is mainly based on the fact that in the magnetic field B of the trap the free cyclotron frequency of a trapped particle can be measured with high fractional precision. We invented a novel method to measure the free cyclotron frequency of a single trapped proton in one shot. The method is based on double-dressed states. By application of frequency modulated sideband drives the double dressing is produced, and energy is transferred between all eigenmodes of the trapped particle.
We have observed spin quantum-jumps with a single trapped proton for the first time. The result is a pioneering step forward in the endeavor to directly measure the magnetic properties of the proton and the antiproton with high precision, and was just published in Physical Review Letters. The measuring principle is based on the observation of a single proton stored in a Penning trap.