Explanipedia

Project 8 Apparatus for Cyclotron Radiation Emission Spectroscopy with $^\mathrm{83m}$Kr and Tritium Open

A. Ashtari Esfahani, D. M. Asner, S. Böser, N. Buzinsky, Rosemarie Cervantes , et al. · 2025

Cyclotron Radiation Emission Spectroscopy (CRES) is a novel technique for the precise measurement of relativistic electron energy. This technique is being employed by the Project~8 collaboration for measuring a high-precision tritium beta …

Measurement of Quadrupole Deformation using E$2$ and M$1+$E$2$ Transitions in Heavy Isotopes in the Mass Range of $150 Open

P. Mohanmurthy, Lixin Qin, J. A. Winger · 2024

The measurement of a permanent electric dipole moment (EDM) in atoms is crucial for understanding the origins of CP-violation. However, accurate interpretation of the EDM in systems involving deformed isotopes requires the characterization…

The MUSE Beamline Calorimeter Open

Wei Lin, T. Rostomyan, R. Gilman, S. Strauch, C. Meier , et al. · 2024

The MUon Scattering Experiment (MUSE) was motivated by the proton radius puzzle arising from the discrepancy between muonic hydrogen spectroscopy and electron-proton measurements. The MUSE physics goals also include testing lepton universa…

Statistical reach of Neutron Electric Dipole Moment Experiments to Neutron to Mirror-Neutron Oscillations Open

P. Mohanmurthy, J. A. Winger · 2024

Baryogenesis requires baryon number violation. Certain extensions to the Standard Model have proposed the existence of an exact, but parity-conjugated, copy of the ordinary elementary particles called mirror particles. Several experiments …

A survey of nuclear quadrupole deformation in order to estimate the nuclear MQM and its relative contribution to the atomic EDM Open

P. Mohanmurthy, Umesh Silwal, J. A. Winger · 2024

Measurement of a non-zero permanent electric dipole moment (EDM) in fundamental particles, such as in an electron or a neutron, or in nuclei or atoms, can help us gain a handle on the sources of Charge-Parity (CP) violation, both in the St…

A survey of nuclear quadrupole deformation in order to estimate the nuclear MQM and its relative contribution to the atomic EDM Open

P. Mohanmurthy, Umesh Silwal, J. A. Winger · 2024

New sources of charge-parity (CP) violation, beyond the known sources in the standard model (SM), are required to explain the baryon asymmetry of the universe. Measurement of a non-zero permanent electric dipole moment (EDM) in fundamental…

Instrumental uncertainties in radiative corrections for the MUSE experiment Open

L. Li, S. Strauch, J. C. Bernauer, W. J. Briscoe, A. Christopher Ndukwe , et al. · 2024

Blinding for precision scattering experiments: The MUSE approach as a case study Open

J. C. Bernauer, E. W. Cline, H. Ataç, W. J. Briscoe, A. Christopher Ndukwe , et al. · 2023

Human bias is capable of changing the analysis of measured data sufficiently to alter the results of an experiment. It is incumbent upon modern experiments, especially those investigating quantities considered contentious in the broader co…

A Novel Technique of Extracting UCN Decay Lifetime from Storage Chamber Measurements Dominated by Scattering Losses Open

P. Mohanmurthy, J. A. Formaggio, D. J. Salvat, J. A. Winger · 2023

The neutron’s lifetime is a critical parameter in the standard model. Its measurements, particularly measurements using both beamline and ultracold neutron storage techniques, have revealed significant tension. In this work, we review the …

Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI Open

N. J. Ayres, G Bison, K. Bodek, V Bondar, T Bouillaud , et al. · 2023

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, …

Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US Open

Ricardo Alarcón, A E Aleksandrova, S. Baeßler, D. H. Beck, Tanmoy Bhattacharya , et al. · 2023

Fundamental neutron physics, combining precision measurements and theory, probes particle physics at short range with reach well beyond the highest energies probed by the LHC. Significant US efforts are underway that will probe BSM CP viol…

Search for ultralight axion dark matter in a side-band analysis of a ${}^{199}$Hg free-spin precession signal Open

C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek , et al. · 2023

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 tra…

Instrumental uncertainties in radiative corrections for the MUSE experiment Open

L. Li, S. Strauch, J. C. Bernauer, W. J. Briscoe, A. Christopher Ndukwe , et al. · 2023

The MUSE experiment at the Paul Scherrer Institute is measuring elastic lepton-proton scattering cross sections in a four-momentum transfer range from $Q^2$ of approximately 0.002 to 0.08 GeV$^2$ using positively and negatively charged ele…

A new direct detection electron scattering experiment to search for the X17 particle Open

D. Dutta, H. Gao, A. Gasparian, T. J. Hague, N. Liyanage , et al. · 2023

A new electron scattering experiment (E12-21-003) to verify and understand the nature of hidden sector particles, with particular emphasis on the so-called X17 particle, has been approved at Jefferson Lab. The search for these particles is…

Nuclear $β$ decay as a probe for physics beyond the Standard Model Open

M. Brodeur, N. Buzinsky, M. A. Caprio, V. Cirigliano, J. A. Clark , et al. · 2023

This white paper was submitted to the 2022 Fundamental Symmetries, Neutrons, and Neutrinos (FSNN) Town Hall Meeting in preparation for the next NSAC Long Range Plan. We advocate to support current and future theoretical and experimental se…

Search for ultralight axion dark matter in a side-band analysis of a 199Hg free-spin precession signal Open

C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek , et al. · 2022

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 tra…

Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment Open

C. Abel, N. J. Ayres, G. Bison, M. Kuźniak, В. М. Бондар , et al. · 2022

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…

Characterization of muon and electron beams in the Paul Scherrer Institute PiM1 channel for the MUSE experiment Open

E. Cline, W. Lin, Promita Roy, P. E. Reimer, K. E. Mesick , et al. · 2022

The MUon Scattering Experiment, MUSE, at the Paul Scherrer Institute, Switzerland, investigates the proton charge radius puzzle, lepton universality, and two-photon exchange, via simultaneous measurements of elastic muon-proton and electro…

A Search for Neutron to Mirror Neutron Oscillation Using Neutron Electric Dipole Moment Measurements Open

P. Mohanmurthy, A. R. Young, J. A. Winger, G. Zsigmond · 2022

Baryon number violation is a key ingredient of baryogenesis. It has been hypothesized that there could also be a parity-conjugated copy of the standard model particles, called mirror particles. The existence of such a mirror universe has s…

Ultracold neutron storage simulation using the Kassiopeia software package Open

Zachary Bogorad, P. Mohanmurthy, J. A. Formaggio · 2022

The Kassiopeia software package was originally developed to simulate electromagnetic fields and charged particle trajectories for neutrino mass measurement experiments. Recent additions to Kassiopeia also allow it to simulate neutral parti…

Erratum to: Data blinding for the nEDM experiment at PSI Open

N. J. Ayres, G. Ban, G. Bison, K. Bodek, В. М. Бондар , et al. · 2021

Johnson-Nyquist noise effects in neutron electric-dipole-moment experiments Open

N. J. Ayres, G. Ban, G. Bison, K. Bodek, В. М. Бондар , et al. · 2021

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…

Data blinding for the nEDM experiment at PSI Open

N. J. Ayres, G. Ban, G. Bison, K. Bodek, В. М. Бондар , et al. · 2021

Estimation of CP violating EDMs from known mechanisms in the SM Open

P. Mohanmurthy, J. A. Winger · 2021

New sources of CP violation, beyond the known sources in the standard model\n(SM), are required to explain the baryon asymmetry of the universe. Measurement\nof a non-zero permanent electric dipole moment (EDM) for fundamental particles,\n…

Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment Open

C. Abel, N. J. Ayres, A. П. Серебров, G. Bison, K. Bodek , et al. · 2021

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 …

A search for neutron to mirror-neutron oscillations using the nEDM apparatus at PSI Open

C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek , et al. · 2020

Timing detectors with SiPM read-out for the MUSE experiment at PSI Open

T. Rostomyan, E. Cline, I. Lavrukhin, H. Ataç, A. Atencio , et al. · 2020

The Muon Scattering Experiment at the Paul Scherrer Institut uses a mixed beam of electrons, muons, and pions, necessitating precise timing to identify the beam particles and reactions they cause. We describe the design and performance of …

Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment Open

C. Abel, S. Afach, N. J. Ayres, G. Bison, M. Kuźniak , et al. · 2020

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 …

Measurement of the Permanent Electric Dipole Moment of the Neutron Open

C. Abel, S. Afach, N. J. Ayres, C.A. Baker, G. Ban , et al. · 2020

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…

A Search for Neutron to Mirror-Neutron Oscillations Open

P. Mohanmurthy · 2020

It has been proposed that there could be a mirror copy of the standard model particles, restoring the parity symmetry in the weak interaction on the global level. Oscillations between a neutral standard model particle, such as the neutron,…

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