G. Pignol
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View article: Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI
Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI Open
We report on a search for a new, short-range, spin-dependent interaction using a modified version of the experimental apparatus used to measure the permanent neutron electric dipole moment at the Paul Scherrer Institute. This interaction, …
View article: Report on 2212.02403v1
Report on 2212.02403v1 Open
Ultra-low-mass axions are a viable dark matter candidate and may form a coherently oscillating classical field.Nuclear spins in experiments on Earth might couple to this oscillating axion dark-matter field, when propagating on Earth's traj…
View article: Determination of diffusion coefficients of mercury atoms in various gases from longitudinal spin relaxation in magnetic gradients
Determination of diffusion coefficients of mercury atoms in various gases from longitudinal spin relaxation in magnetic gradients Open
We present a method to measure the binary diffusion coefficient of mercury atoms in a gas at room temperature and low pressure. It is based on the measurement of the longitudinal spin relaxation of optically pumped mercury-199 atoms in a m…
View article: Publisher’s Note: “The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements” [Rev. Sci. Instrum. 93, 095105 (2022)]
Publisher’s Note: “The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements” [Rev. Sci. Instrum. 93, 095105 (2022)] Open
status: Published
View article: Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment
Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment Open
Experiments dedicated to the measurement of the electric dipole moment of the\nneutron require outstanding control of the magnetic field uniformity. The\nneutron electric dipole moment (nEDM) experiment at the Paul Scherrer Institute\nuses…
View article: The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements
The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements Open
We present the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute, which features an interior cubic volume with each side of length 2.92 m, thus providing an accessible space of 25 m3. The MSR has 87 o…
View article: Manipulation of gravitational quantum states of a bouncing neutron with the GRANIT spectrometer
Manipulation of gravitational quantum states of a bouncing neutron with the GRANIT spectrometer Open
The bouncing neutron is one of the rare system where gravity can be studied in a quantum framework. To this end it is crucial to be able to select some specific gravitational quantum state (GQS). The GRANIT apparatus is the first physics e…
View article: Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment
Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment Open
Different extensions of the standard model of particle physics, such as braneworld or mirror matter models, predict the existence of a neutron sterile state, possibly as a dark matter candidate. This Letter reports a new experimental const…
View article: The search for the neutron electric dipole moment at PSI
The search for the neutron electric dipole moment at PSI Open
The existence of a nonzero permanent electric dipole moment (EDM) of the neutron would reveal a new source of CP violation and shed light on the origin of the matter–antimatter asymmetry of the Universe. The sensitivity of current experime…
View article: The design of the n2EDM experiment: nEDM Collaboration
The design of the n2EDM experiment: nEDM Collaboration Open
We present the design of a next-generation experiment, n2EDM, currently under construction at the ultracold neutron source at the Paul Scherrer Institute (PSI) with the aim of carrying out a high-precision search for an electric dipole mom…
View article: Johnson-Nyquist noise effects in neutron electric-dipole-moment experiments
Johnson-Nyquist noise effects in neutron electric-dipole-moment experiments Open
Magnetic Johnson-Nyquist noise (JNN) originating from metal electrodes, used\nto create a static electric field in neutron electric-dipole-moment (nEDM)\nexperiments, may limit the sensitivity of measurements. We present here the\nfirst de…
View article: Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment
Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment Open
Experiments dedicated to the measurement of the electric dipole moment of the neutron require outstanding control of the magnetic field uniformity. The neutron electric dipole moment (nEDM) experiment at the Paul Scherrer Institute uses a …
View article: MURMUR: a new low-noise experiment for the search of neutron-hidden neutron transitions in the context of braneworld scenarios
MURMUR: a new low-noise experiment for the search of neutron-hidden neutron transitions in the context of braneworld scenarios Open
{MURMUR is a new passing-through-walls neutron experiment installed near the BR2 nuclear reactor at the Belgian Nuclear Research Center (SCK$\\cdot$CEN, Mol, Belgium) and designed to search neutron interbrane transitions in the context of …
View article: Report on scipost_202102_00004v1
Report on scipost_202102_00004v1 Open
The existence of a nonzero permanent electric dipole moment (EDM) of the neutron would reveal a new source of CP violation and shed light on the origin of the matterantimatter asymmetry of the Universe.The sensitivity of current experiment…
View article: Precision experiments with muons and neutrons
Precision experiments with muons and neutrons Open
The precision experiments with muons and neutrons are described. The topics selected cover the anomalies of the muon and the neutron lifetime, and searches for charged lepton flavour violation CLFV of transition and the neutron ele…
View article: Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment
Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment Open
An array of 16 laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's …
View article: Measurement of the Permanent Electric Dipole Moment of the Neutron
Measurement of the Permanent Electric Dipole Moment of the Neutron Open
We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons. Our measurement stands…
View article: A global perspective on searches for Electric Dipole Moments
A global perspective on searches for Electric Dipole Moments Open
Many experiments are underway in the world to search for a non-zero electric dipole moment (EDM) of a particle with spin 1/2 such as the neutron or the electron. Finding an EDM would reveal new sources of CP violation. EDM measurements are…
View article: Magnetic-field uniformity in neutron electric-dipole-moment experiments
Magnetic-field uniformity in neutron electric-dipole-moment experiments Open
International audience
View article: Design and test of a compact and high-resolution time-of-flight measurement device for cold neutron beams
Design and test of a compact and high-resolution time-of-flight measurement device for cold neutron beams Open
A time-of-flight device was developed to characterize wavelength distribution\nand uniformity of a cold neutron beam. This device is very compact -- the\ndistance of flight is $60$ cm -- but achieves very high resolution -- the\nintrinsic …
View article: nEDM experiment at PSI: Data-taking strategy and sensitivity of the dataset
nEDM experiment at PSI: Data-taking strategy and sensitivity of the dataset Open
We report on the strategy used to optimize the sensitivity of our search for a neutron electric dipole moment at the Paul Scherrer Institute. Measurements were made upon ultracold neutrons stored within a single chamber at the heart of our…
View article: The n2EDM experiment at the Paul Scherrer Institute
The n2EDM experiment at the Paul Scherrer Institute Open
We present the new spectrometer for the neutron electric dipole moment (nEDM) search at the Paul Scherrer Institute (PSI), called n2EDM. The setup is at room temperature in vacuum using ultracold neutrons. n2EDM features a large UCN double…
View article: Monte Carlo Simulations for the Optimization and Data Analysis of Experiments with Ultracold Neutrons
Monte Carlo Simulations for the Optimization and Data Analysis of Experiments with Ultracold Neutrons Open
Ultracold neutrons (UCN) with kinetic energies up to 300 neV can be stored in\nmaterial or magnetic confinements for hundreds of seconds. This makes them a\nvery useful tool for probing fundamental symmetries of nature, by searching for\nc…