Ivo Schulthess

We investigate the response of a Ramsey-type experiment on an additional oscillating magnetic field. This superimposed field is oriented in the same direction as the static main magnetic field and causes a modulation of the original Larmor spin precession frequency. The observable magnitude of this modulation decreases at higher frequencies of the oscillating field. It disappears completely if the interaction time of the particles matches the oscillation period, which we call resonant cancellation.

Abstract We report on a search for dark matter axionlike particles (ALPs) using a Ramsey-type apparatus for cold neutrons. A hypothetical ALP-gluon coupling would manifest in a neutron electric dipole moment signal oscillating in time. Twenty-four hours of data have been analyzed in a frequency range from 23μHz to 1 kHz, and no significant oscillating signal has been found.

Author Affiliations Karsten Schuhmann,1,2,* Klaus Kirch,1,2 Miroslaw Marszalek,2 Francois Nez,3 Randolf Pohl,4 Ivo Schulthess,1 Laura Sinkunaite,2 Gunther Wichmann,1 Manuel Zeyen,1 and Aldo Antognini1,2 1Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland 2Paul Scherrer Institute, 5232 Villigen PSI, Switzerland 3Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 75005 Paris, France 4Johannes...