619 citations · 3.1k across the 55 of their papers we have counts for
23 papers · 1 filter
A first extraction of the weak magnetism form factor and Fierz interference term from the In Sn Gamow-Teller transition
L. De Keukeleere, D. Rozpedzik, N. Severijns +5
Spectrum shape measurements in nuclear decay can be used to test physics beyond the Standard Model with results being complementary to high-energy collider experiments. In part…
Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI
N. J. Ayres, G. Bison, K. Bodek +44
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 dipol…
Search for ultralight axion dark matter in a side-band analysis of a 199Hg free-spin precession signal
C. Abel, N. J. Ayres, G. Ban +35
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 oscillati…
Muonic atom spectroscopy with microgram target material
A. Adamczak, A. Antognini, N. Berger +26
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 nucl…
values of the mirror transitions and the weak magnetism induced current in allowed nuclear decay
N. Severijns, L. Hayen, V. De Leebeeck +4
In recent years a number of correlation measurements in nuclear decay have been performed reaching a precision of the order of 1\% and below and it is expected that even higher…
Johnson-Nyquist Noise Effects in Neutron Electric-Dipole-Moment Experiments
N. J. Ayres, G. Ban, G. Bison +37
Magnetic Johnson-Nyquist noise (JNN) originating from metal electrodes, used to create a static electric field in neutron electric-dipole-moment (nEDM) experiments, may limit the s…
The measurement of the quadrupole moment of 185-Re and 187-Re from the hyperfine structure of muonic X rays
A. Antognini, N. Berger, T. E. Cocolios +23
The hyperfine splitting of the 5g -> 4f transitions in muonic 185,187-Re has been measured using high resolution HPGe detectors and compared to state-of-the-art atomic theoretical…
Simultaneous Measurements of the Beta Neutrino Angular Correlation in Ar Pure Fermi and Pure Gamow-Teller Transitions using Beta-Proton Coincidences
V. Araujo-Escalona, D. Atanasov, X. Fléchard +14
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…
-value determination for NaNe and MgNa mirror-nuclei decays using high-precision mass spectrometry with ISOLTRAP at ISOLDE/CERN
Jonas Karthein, Dinko Atanasov, Klaus Blaum +14
We report on high-precision values of the NaNe and MgNa mirror -transitions from mass measurements with ISOLT…
Statistical sensitivity of the nEDM apparatus at PSI to neutron mirror-neutron oscillations
C. Abel, N. Ayres, G. Bison +33
The neutron and its hypothetical mirror counterpart, a sterile state degenerate in mass, could spontaneously mix in a process much faster than the neutron -decay. Two groups hav…
Measurement of the -asymmetry parameter of Cu in search for tensor type currents in the weak interaction
G. Soti, F. Wauters, M. Breitenfeldt +11
Precision measurements at low energy search for physics beyond the Standard Model in a way complementary to searches for new particles at colliders. In the weak sector the most gen…
Electron shakeoff following the ?+ decay of trapped 35Ar+ ions
C. Couratin, X. Fabian, B. Fabre +15
The electron shakeoff of Cl atoms resulting from the decay of Ar ions has been investigated using a Paul trap coupled to a recoil-ion spectrometer. The ch…
Measurement of Transverse Polarization of Electrons Emitted in Free Neutron Decay
A. Kozela, G. Ban, A. Białek +8
The final analysis of the experiment determining both components of the transverse polarization of electrons (, ) emitted in the -decay of polarized, free…
Hyperfine Field and Hyperfine Anomalies of Copper Impurities in Iron
V. V. Golovko, F. Wauters, S. Cottenier +9
A new value for the hyperfine magnetic field of copper impurities in iron is obtained by combining resonance frequencies from experiments involving β-NMR on oriented nuclei on 59-C…
The half-life of Fr in Si and Au at 4K and at mK temperatures
F. Wauters, B. Verstichel, M. Breitenfeldt +10
The half-life of the decaying nucleus Fr was determined in different environments, i.e. embedded in Si at 4 K, and embedded in Au at 4 K and about 20 mK. No differences…
First detection and energy measurement of recoil ions following beta decay in a Penning trap with the WITCH experiment
M. Beck, S. Coeck, V. Yu. Kozlov +13
The WITCH experiment (Weak Interaction Trap for CHarged particles) will search for exotic interactions by investigating the beta-neutrino angular correlation via the measurement of…
Magnetic moment of Ag-104(m) and the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance on oriented nuclei
V. V. Golovko, I. S. Kraev, T. Phalet +13
Nuclear magnetic resonance (NMR/ON) measurements with beta- and gamma-ray detection have been performed on oriented Ag-104(g,m) nuclei with the NICOLE He-3-He-4 dilution refrigerat…
Precision measurements of the Co -asymmetry parameter in search for tensor currents in weak interactions
F. Wauters, I. S. Kraev, D. Zákoucký +13
The -asymmetry parameter for the Gamow-Teller decay of Co was measured by polarizing the radioactive nuclei with the brute force low-temperature nuclear-o…
Beta asymmetry parameter in the decay of 114In
F. Wauters, V. De Leebeeck, I. Kraev +5
The beta asymmetry parameter A for the pure Gamow-Teller decay of 114In is reported. The low temperature nuclear orientation method was combined with a GEANT4 based simulation code…
Performance of silicon PIN photodiodes at low temperatures and in high magnetic fields
F. Wauters, I. S. Kraev, M. Tandecki +4
The performance of a Si PIN diode (type Hamamatsu S3590-06) as an energy sen- sitive detector operating at cryogenic temperatures (~10 K) and in magnetic fields up to 11 T was inve…
Ft values of the T = 1/2 mirror beta transitions
N. Severijns, M. Tandecki, T. Phalet +1
A complete survey is presented of all half-life and branching-ratio measurements related to the isospin T = 1/2 mirror beta transitions ranging from 3He to 83Mo. No measurements ar…
The WITCH Experiment: towards weak interactions studies. Status and prospects
V. Yu. Kozlov, M. Beck, S. Coeck +8
Primary goal of the WITCH experiment is to test the Standard Model for a possible ad-mixture of a scalar or tensor type interaction in beta-decay. This information will be inferred…
Tests of the standard electroweak model in beta decay
N. Severijns, M. Beck, O. Naviliat-Cuncic
We review the current status of precision measurements in allowed nuclear beta decay, including neutron decay, with emphasis on their potential to look for new physics beyond the s…