N. Severijns
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View article: A curated dataset on the distribution of West Palaearctic freshwater bivalves
A curated dataset on the distribution of West Palaearctic freshwater bivalves Open
View article: Development of electron detectors for the BRAND experiment
Development of electron detectors for the BRAND experiment Open
View article: Performance of gas electron tracking detectors for beta decay studies
Performance of gas electron tracking detectors for beta decay studies Open
At the low-energy frontier, among the experiments testing the Standard Model and searching for new physics, are precision spectrum shape and correlation coefficient measurements in nuclear and neutron beta decay. For identification and 3D-…
View article: Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments
Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments Open
View article: A large ‘Active Magnetic Shield’ for a high-precision experiment
A large ‘Active Magnetic Shield’ for a high-precision experiment Open
We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magneti…
View article: Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments
Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments Open
High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for…
View article: Study of weak magnetism by precision spectrum shape measurements in nuclear beta decay
Study of weak magnetism by precision spectrum shape measurements in nuclear beta decay Open
Nuclear beta decays play an important role in uncovering the nature of the weak interaction. The weak magnetism (WM) form factor, b WM , is generally a small correction to the beta decay rate that arises at first order as an interference t…
View article: Search for beyond standard model physics in free neutron decay
Search for beyond standard model physics in free neutron decay Open
Applying a Mott polarimetry for measurement of the transverse polarization components of electrons from free neutron decay as well as proton momentum reconstruction using the combination of the time of flight method and the kinematical con…
View article: Superallowed decays within and beyond the standard model
Superallowed decays within and beyond the standard model Open
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: The non-destructive investigation of a late antique knob bow fibula (Bügelknopffibel) from Kaiseraugst/CH using Muon Induced X-ray Emission (MIXE)
The non-destructive investigation of a late antique knob bow fibula (Bügelknopffibel) from Kaiseraugst/CH using Muon Induced X-ray Emission (MIXE) Open
View article: Experimental setup for Weak Interaction Studies with Radioactive ion-beams WISArD
Experimental setup for Weak Interaction Studies with Radioactive ion-beams WISArD Open
The article describes the commissioning and technical development of the Weak Interaction Studies with 32Ar Decay (WISArD) experiment, installed at the radioactive ion-beam facility ISOLDE/CERN. The experiment aims to extend the present li…
View article: Muonic atom spectroscopy with microgram target material
Muonic atom spectroscopy with microgram target material Open
Muonic atom spectroscopy–the measurement of the x rays emitted during the formation process of a muonic atom–has a long standing history in probing the shape and size of nuclei. In fact, almost all stable elements have been subject to muon…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="script">F</mml:mi><mml:mi>t</mml:mi></mml:mrow></mml:math> values of the mirror <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> transitions and the weak-magnetism-induced current in allowed nuclear <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> decay
values of the mirror transitions and the weak-magnetism-induced current in allowed nuclear decay Open
The precision of correlation measurements in neutron and nuclear β decay has now reached the level of about 1% and better. At this level of precision, higher-order corrections such as recoil-order corrections induced by the strong interact…
View article: BRAND—A detection system for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e59" altimg="si18.svg"><mml:mi>β</mml:mi></mml:math>-decay correlation measurement
BRAND—A detection system for -decay correlation measurement Open
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: Gas electron tracking detector for beta decay experiments
Gas electron tracking detector for beta decay experiments Open
For identification and 3D-tracking of low-energy electrons a new type of gas-based detector was designed that minimizes scattering and energy loss. The current version of the detector is a combination of a plastic scintillator, serving as …
View article: Influence of the recoil-order and radiative correction on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> decay correlation coefficients in mirror decays
Influence of the recoil-order and radiative correction on the decay correlation coefficients in mirror decays Open
Measurements of the beta decay correlation coefficients in nuclear decay aim\nfor a precision below $1\\%$ and theoretical predictions should follow this\ntrend. In this work, the influence of the two dominant Standard Model\ncorrection te…
View article: Mott polarimeter for electrons from neutron decay in BRAND experiment
Mott polarimeter for electrons from neutron decay in BRAND experiment Open
The BRAND experiment aims at the search of Beyond Standard Model (BSM) physics via\nmeasurement of exotic components of week interaction. For this purpose the eleven correlation\ncoefficients of the neutron β decay will be measured simulta…
View article: Search for BSM physics with neutron beta decay in the BRAND project
Search for BSM physics with neutron beta decay in the BRAND project Open
Neutron and nuclear beta decay correlation coefficients are sensitive to the exotic scalar and tensor interactions hypotheses that are beyond the Standard Model (BSM). The BRAND project aims at a test of the Lorentz structure of weak inter…
View article: Beta spectrum shape measurements using a multi-wire drift chamber and a plastic scintillator
Beta spectrum shape measurements using a multi-wire drift chamber and a plastic scintillator Open
Spectrum shape measurements in nuclear $\\beta$ decay are a versatile observable. They can be used to test physics beyond the Standard Model with results being complementary to high energy collider experiments. In addition, the $\\beta$ sp…
View article: Characterization of a Continuous Muon Source for the Non-Destructive and Depth-Selective Elemental Composition Analysis by Muon Induced X- and Gamma-rays
Characterization of a Continuous Muon Source for the Non-Destructive and Depth-Selective Elemental Composition Analysis by Muon Induced X- and Gamma-rays Open
The toolbox for material characterization has never been richer than today. Great progress with all kinds of particles and interaction methods provide access to nearly all properties of an object under study. However, a tomographic analysi…
View article: Characterization of a continuous muon source for the Muon-Induced X-ray Emission (MIXE) Technique
Characterization of a continuous muon source for the Muon-Induced X-ray Emission (MIXE) Technique Open
The toolbox for material characterization has never been richer than today. Great progress with all kinds of particles and interaction methods provide access to nearly all properties of an object under study. However, a tomographic analysi…
View article: BRAND – exploring transverse polarization of electrons emitted in neutron decay
BRAND – exploring transverse polarization of electrons emitted in neutron decay Open
Neutron and nuclear beta decay correlation coefficients are sensitive to the exotic scalar and tensor interactions that are not included in the Standard Model (SM). The proposed experiment BRAND will measure simultaneously seven neutron co…
View article: $\mathcal{F}t$ values of the mirror $\beta$ transitions and the weak magnetism induced current in allowed nuclear $\beta$ decay
$\mathcal{F}t$ values of the mirror $\beta$ transitions and the weak magnetism induced current in allowed nuclear $\beta$ decay Open
In recent years a number of correlation measurements in nuclear $\beta$ decay have been performed reaching a precision of the order of 1\% and below and it is expected that even higher precision will be reached in the near future. At these…
View article: $\mathcal{F}t$ values of the mirror $β$ transitions and the weak magnetism induced current in allowed nuclear $β$ decay
$\mathcal{F}t$ values of the mirror $β$ transitions and the weak magnetism induced current in allowed nuclear $β$ decay Open
In recent years a number of correlation measurements in nuclear $β$ decay have been performed reaching a precision of the order of 1\% and below and it is expected that even higher precision will be reached in the near future. At these lev…
View article: Optical-Magnetometry-Based Current Source
Optical-Magnetometry-Based Current Source Open
We present a current monitoring system based on optical magnetometry, which\nis able to discriminate true current variations from environmental effects at\nroom temperature. The system consists of a dedicated thermally stable magnetic\nfie…
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…