Conveners
We - 1
- Session Chair: Takeyasu Ito (Los Alamos National Laboratory)
Prof.
Klaus Blaum Blaum
(Max Planck Institut für Kernphysik)
11/09/2013, 08:45
Oral
Recently, high-precision mass measurements of atoms have reached a new quality as far as accuracy, sensitivity and a wide application is concerned. This is due to the development and the use of efficient storage devices, effective cooling methods, sensitive detection techniques and new methods of calibration. This contribution provides a survey over recent high-precision mass measurements on...
Mr
Florian Köhler
(GSI)
11/09/2013, 09:10
Precision measurements of fundamental constants
Oral
The g factor of an electron bound to a nucleus depends on the frequency ratio between the Larmor frequency of the electron and the cyclotron frequency of the ion, the ion mass and the electron mass. The high precision g factor measurement on hydrogen-like silicon 28Si13+ with a relative uncertainty of 8.5*10^-10 perfectly agrees with the bound-state quantum electrodynamical calculations...
Lorenz Willmann
11/09/2013, 09:25
Searches for symmetry violations
Oral
Atomic Parity Violation (APV) arises from the exchange of Z^0 bosons between electrons atomic shell and the quarks within the nucleons of the nucleus. The size of APV effects is strongly enhanced in heavy atoms, even stronger than Z^3 [1]. A single trapped Ra+ ion (Z = 88), which is the heaviest available alkaline earth ion, is a superior system for measuring APV; the effects in Ra+ are some ...
Dr
Paolo Crivelli
(ETH Zurich, Institute for Particle Physics)
11/09/2013, 09:45
Searches for symmetry violations
Oral
We report the progress of the ongoing project at ETH Zurich aiming to improve the current accuracy in the measurement of the energy interval of positronium (Ps) from its ground state (1S) to the first excited state (2S) by a factor of 5. This will result in a very stringent test of QED and will provide the best determination of the positron-electron mass ratio.
If the accuracy of the...
Takayuki Yamazaki
(International Center for Elementary Particle Physics, University of Tokyo)
11/09/2013, 10:05
Low energy precision tests of the Standard Model
Oral
Positronium (Ps), a bound state of an electron and a positron, is a purely leptonic system and is a good target to study Quantum Electrodynamics (QED) in bound state. We plan to directly measure the hyperfine structure of the ground-state positronium (Ps-HFS), which is about 203 GHz. Precise measurements of Ps-HFS have been performed in 1970s and 1980s, but all of them are indirect...
