G. Qúeḿener
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View article: Backscattering Study of Electrons from 0.1 to 3.4 MeV
Backscattering Study of Electrons from 0.1 to 3.4 MeV Open
Benchmarking simulation codes for electron transport and scattering in matter is a crucial step for estimating uncertainties in many applications. However, experimental data for electron energies of a few MeV is scarce to make such compari…
View article: Generating a highly uniform magnetic field inside the magnetically shielded room of the n2EDM experiment
Generating a highly uniform magnetic field inside the magnetically shielded room of the n2EDM experiment Open
View article: Determination of the moments of the proton charge density: is there a proton radius puzzle?
Determination of the moments of the proton charge density: is there a proton radius puzzle? Open
The charge radius of the proton can be determined using two different kinds of experiments: the spectroscopy technique, measuring the hyperfine structure of hydrogen atoms, and the scattering technique, deducing the radius from elastic lep…
View article: Detection of recoil ion in the beta decay of laser oriented trapped radioactive isotopes for the MORA Project
Detection of recoil ion in the beta decay of laser oriented trapped radioactive isotopes for the MORA Project Open
The Matter’s Origin from RAdioActivity ( mora ) project focuses on ion manipulation in traps and laser orientation methods for the searches of New Physics ( np ) in nuclear beta decay by precisely measuring the D correlation parameter. We …
View article: Determination of the moments of the proton charge density
Determination of the moments of the proton charge density Open
A global analysis of proton electric form factor experimental data from Rosenbluth separation and low squared four-momentum transfer experiments is discussed for the evaluation of the spatial moments of the proton charge density based on t…
View article: Precision measurements in the beta decay of <sup>6</sup>He
Precision measurements in the beta decay of <sup>6</sup>He Open
We report here about the ongoing data analysis of an experiment performed at GANIL with a 25 keV 6 He + beam to determine the Fierz interference term from the β particles energy spectrum.
View article: High-precision measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>6</mml:mn></mml:mmultiscripts></mml:math> half-life
High-precision measurement of the half-life Open
The half-life of $^6$He has been measured using a low-energy radioactive beam implanted in an YAlO$_3$ Ce-doped inorganic scintillator and recording decay events in a $4π$ geometry. Events were time-stamped with a digital data acquisition …
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: Model for two-body collisions between ultracold dipolar molecules around a Förster resonance in an electric field
Model for two-body collisions between ultracold dipolar molecules around a Förster resonance in an electric field Open
We propose a one-channel, simple model to describe the dynamics of ultracold dipolar molecules around a Förster resonance. Slightly above a specific electric field, a collisional shielding can take place, suppressing the molecular losses i…
View article: OuroborosBEM: a fast multi-GPU microscopic Monte Carlo simulation for gaseous detectors and charged particle dynamics
OuroborosBEM: a fast multi-GPU microscopic Monte Carlo simulation for gaseous detectors and charged particle dynamics Open
The design of gaseous detectors for accelerator, particle and nuclear physics requires simulations relying on multi-physics aspects. In fact, these simulations deal with the dynamics of a large number of charged particles interacting in a …
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: 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: Field mapping of large aperture superconducting quadrupoles
Field mapping of large aperture superconducting quadrupoles Open
The three quadrupoles of a High Resolution Spectrometer (Jefferson Lab., hall A) were mapped using an array of 10 coils of well-defined geometry. The Q1 quadrupole has a 30 cm diameter bore and was measured over 1.6 m. The dimensions for Q…
View article: Weak interaction studies via beta-delayed proton emission
Weak interaction studies via beta-delayed proton emission Open
View article: Connecting spatial moments and momentum densities
Connecting spatial moments and momentum densities Open
The precision of experimental data and analysis techniques is a key feature\nof any discovery attempt. A striking example is the proton radius puzzle where\nthe accuracy of the spectroscopy of muonic atoms challenges traditional\nelectron …
View article: Geometry optimisation of a transparent axisymmetric ion trap for the MORA project
Geometry optimisation of a transparent axisymmetric ion trap for the MORA project Open
View article: Simultaneous measurements of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-neutrino angular correlation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ar</mml:mi><mml:mprescripts/><mml:none/><mml:mn>32</mml:mn></mml:mmultiscripts></mml:math> pure Fermi and pure Gamow-Teller transitions using <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-proton coincidences
Simultaneous measurements of the -neutrino angular correlation in pure Fermi and pure Gamow-Teller transitions using -proton coincidences Open
We report first time measurements of the beta-neutrino angular correlation based on the kinetic energy shift of protons emitted in parallel or anti-parallel directions with respect to the positron in the beta decay of $^{32}$Ar. This proof…
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: Investigating Shakeoff Process in Precise Correlation Measurements in Nuclear β Decay
Investigating Shakeoff Process in Precise Correlation Measurements in Nuclear β Decay Open
View article: Scalar current limit from the beta-neutrino correlation: the WISArD experiment
Scalar current limit from the beta-neutrino correlation: the WISArD experiment Open
Beta - neutrino correlation measurements are key in the research of physics beyond the Standard Model. In pure Fermi beta transitions, the beta-neutrino correlation coefficient, a βν , is sensitive to the presence of scalar currents. The p…
View article: The open LPC Paul trap for precision measurements in beta decay
The open LPC Paul trap for precision measurements in beta decay Open
View article: Magnetic-field uniformity in neutron electric-dipole-moment experiments
Magnetic-field uniformity in neutron electric-dipole-moment experiments Open
© 2019 American Physical Society. Magnetic-field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial mo…
View article: The open LPC Paul trap for precision measurements in beta decay
The open LPC Paul trap for precision measurements in beta decay Open
The LPCTrap experiment uses an open Paul trap which was built to enable precision measurements in the beta decay of radioactive ions. The initial goal was the precise measurement of the beta-neutrino angular correlation coefficient in the …
View article: Measurement of the Neutral Weak Form Factors of the Proton
Measurement of the Neutral Weak Form Factors of the Proton Open
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point [(Thetalab) = 12.3r and (Q2) = 0.48 (GeV/c)2] is chosen to p…
View article: A simple method of coil design
A simple method of coil design Open
In this article, we present a method to design a coil producing an arbitrarily shaped magnetic field by restricting the path of the coil's wires to a regular grid. The solution is then found by a simple least squares minimum. We discuss pr…
View article: Demonstration of sensitivity increase in mercury free-spin-precession magnetometers due to laser-based readout for neutron electric dipole moment searches
Demonstration of sensitivity increase in mercury free-spin-precession magnetometers due to laser-based readout for neutron electric dipole moment searches Open
View article: Electron shakeoff following the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>β</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ne</mml:mi><mml:none/><mml:mo>+</mml:mo><mml:mprescripts/><mml:none/><mml:mn>19</mml:mn></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ar</mml:mi><mml:none/><mml:mo>+</mml:mo><mml:mprescripts/><mml:none/><mml:mn>35</mml:mn></mml:mmultiscripts></mml:math>trapped ions
Electron shakeoff following thedecay ofandtrapped ions Open
The electron shakeoff of F19 and Cl35 atoms resulting from the β+ decay of Ne+19 and Ar+35 ions has been investigated using a Paul trap coupled to a time of flight recoil-ion spectrometer. The charge-state distributions of the recoiling da…
View article: Development of a radio-frequency quadrupole cooler for high beam currents
Development of a radio-frequency quadrupole cooler for high beam currents Open
The SHIRaC prototype is a recently developed radio-frequency quadrupole (RFQ) beam cooler with an improved optics design to deliver the required beam quality to a high resolution separator (HRS). For an isobaric separation of isotopes, the…
View article: Active compensation of magnetic field distortions based on vector spherical harmonics field description
Active compensation of magnetic field distortions based on vector spherical harmonics field description Open
An analytic solution to the magnetostatic inverse problem in the framework of vector spherical harmonic basis functions is presented. This formalism is used for the design of a spherical magnetic field compensation system and its performan…