Explanipedia

Measurement of the inhomogeneity of the KATRIN tritium source electric potential by high-resolution spectroscopy of conversion electrons from $$\mathbf {^{83m}}$$Kr Open

H. Acharya, M. Aker, D. Batzler, A. Beglarian, J. Beisenkötter , et al. · 2025

Calorimetric wire detector for measurement of atomic hydrogen beams Open

M. Astaschov, S. Bhagvati, S. Böser, Matthew J. Brandsema, R. Cabral , et al. · 2025

A calorimetric detector for minimally disruptive measurements of atomic hydrogen beams is described. The calorimeter measures heat released by the recombination of hydrogen atoms into molecules on a thin wire. As a demonstration, the angul…

Antenna Arrays for CRES-based Neutrino Mass Measurement Open

A. Ashtari Esfahani, S. Bhagvati, S. Böser, Matthew J. Brandsema, N. Buzinsky , et al. · 2025

CRES is a technique for precision measurements of kinetic energies of charged particles, pioneered by the Project 8 experiment to measure the neutrino mass using the tritium endpoint method. It was recently employed for the first time to m…

Direct neutrino-mass measurement based on 259 days of KATRIN data Open

M. Aker, Dominic Batzler, A. Beglarian, J. Behrens, J. Beisenkötter , et al. · 2025

That neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass holds relevance in fields from particle physics to cosmology. We report on the search for the effec…

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 …

White paper on light sterile neutrino searches and related phenomenology Open

M. A. Acero, C. Argüelles, Matheus Hostert, D. Kalra, G. Karagiorgi , et al. · 2024

This white paper provides a comprehensive review of our present understanding of experimental neutrino anomalies that remain unresolved, charting the progress achieved over the last decade at the experimental and phenomenological level, an…

Larmor power limit for cyclotron radiation of relativistic particles in a waveguide Open

N. Buzinsky, R. J. Taylor, W.J. Byron, W. DeGraw, Brian W. Dodson , et al. · 2024

Cyclotron radiation emission spectroscopy (CRES) is a modern technique for high-precision energy spectroscopy, in which the energy of a charged particle in a magnetic field is measured via the frequency of the emitted cyclotron radiation. …

Solar fusion III: New data and theory for hydrogen-burning stars Open

Bijaya Acharya, M. Aliotta, A. B. Balantekin, D. Bemmerer, C. A. Bertulani , et al. · 2024

In stars that lie on the main sequence in the Hertzsprung-Russel diagram, like our sun, hydrogen is fused to helium in a number of nuclear reaction chains and series, such as the proton-proton chain and the carbon-nitrogen-oxygen cycles. P…

Real-time signal detection for Cyclotron Radiation Emission Spectroscopy measurements using antenna arrays Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens , et al. · 2024

Cyclotron Radiation Emission Spectroscopy (CRES) is a technique for precision measurement of the energies of charged particles, which is being developed by the Project 8 Collaboration to measure the neutrino mass using tritium beta-decay s…

Deep learning based event reconstruction for cyclotron radiation emission spectroscopy Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, R. Cervantes , et al. · 2024

The objective of the cyclotron radiation emission spectroscopy (CRES) technology is to build precise particle energy spectra. This is achieved by identifying the start frequencies of charged particle trajectories which, when exposed to an …

Cyclotron radiation emission spectroscopy of electrons from tritium decay and internal conversion Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens , et al. · 2024

Project 8 has developed a novel technique, cyclotron radiation emission spectroscopy (CRES), for direct neutrino mass measurements. A CRES-based experiment on the beta spectrum of tritium has been carried out in a small-volume apparatus. H…

Progress report on the Los Alamos tritium beta decay experiment Open

J. F. Wilkerson, T. J. Bowles, David A. Knapp, R. G. H. Robertson, D. L. Wark · 2024

Measurements near the endpoint of the tritium beta-decay spectrum using a gaseous molecular tritium source yield an essentially model-independent upper limit of 27 eV on the /ovr ..nu..//sub e/ mass at the 95% confidence level. Since demon…

Status of the Los Alamos tritium beta decay experiment Open

R. G. H. Robertson, T. J. Bowles, D. L. Wark, J. F. Wilkerson, David A. Knapp · 2024

The Los Alamos tritium experiment employs a gaseous tritium source and a magnetic spectrometer to determine the mass of the electron antineutrino from the shape of the tritium beta spectrum. Since publication of the first result from this …

Limit on the anti nu/sub e/ mass in free molecular tritium beta decay Open

T. J. Bowles, J. F. Wilkerson, J.C. Browne, M. P. Maley, R. G. H. Robertson , et al. · 2024

The beta spectrum of the decay of free molecular tritium has been accurately measured in order to search for a finite anti nu/sub e/ mass. The final state effects in molecular tritium are accurately known and the data thus yield an essenti…

Real-time Signal Detection for Cyclotron Radiation Emission Spectroscopy Measurements using Antenna Arrays Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens , et al. · 2023

Cyclotron Radiation Emission Spectroscopy (CRES) is a technique for precision measurement of the energies of charged particles, which is being developed by the Project 8 Collaboration to measure the neutrino mass using tritium beta-decay s…

Tritium Beta Spectrum Measurement and Neutrino Mass Limit from Cyclotron Radiation Emission Spectroscopy Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens , et al. · 2023

The absolute scale of the neutrino mass plays a critical role in physics at every scale, from the subatomic to the cosmological. Measurements of the tritium end-point spectrum have provided the most precise direct limit on the neutrino mas…

Search for keV-scale sterile neutrinos with the first KATRIN data Open

M. Aker, D. Batzler, A. Beglarian, J. Behrens, A. Berlev , et al. · 2023

First Observation of Cyclotron Radiation from MeV-Scale following Nuclear Decay Open

W. Byron, H. Harrington, R. J. Taylor, W. DeGraw, N. Buzinsky , et al. · 2023

We present an apparatus for detection of cyclotron radiation yielding a frequency-based β^{±} kinetic energy determination in the 5 keV to 2.1 MeV range, characteristic of nuclear β decays. The cyclotron frequency of the radiating β partic…

Shake-up and shake-off effects in neutrinoless double- decay Open

J. A. Detwiler, R. G. H. Robertson · 2023

Here, we revisit the role of shake-up and shake-off effects in neutrinoless double-β decay, following earlier work by Drukarev et al. [Phys. Rev. C 94, 035504 (2016)]. We find in agreement with Drukarev et al. that the Q value of …

SYNCA: A Synthetic Cyclotron Antenna for the Project 8 Collaboration Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens , et al. · 2023

Cyclotron Radiation Emission Spectroscopy (CRES) is a technique for measuring the kinetic energy of charged particles through a precision measurement of the frequency of the cyclotron radiation generated by the particle's motion in a magne…

SYNCA: A Synthetic Cyclotron Antenna for the Project 8 Collaboration Open

A. Ashtari Esfahani, S. Böser, N. Buzinsky, M. C. Carmona-Benitez, C. Claessens , et al. · 2022

Cyclotron Radiation Emission Spectroscopy (CRES) is a technique for measuring the kinetic energy of charged particles through a precision measurement of the frequency of the cyclotron radiation generated by the particle's motion in a magne…

An active transverse energy filter to differentiate low energy particles with large pitch angles in a strong magnetic field Open

K. Gauda, S. Schneidewind, G. Drexlin, A. Fulst, V. Hannen , et al. · 2022

Shake-up and shake-off effects in neutrinoless double-beta decay Open

J. A. Detwiler, R. G. H. Robertson · 2022

We revisit the role of shake-up and shake-off effects in neutrinoless double-beta decay, following earlier work by Drukarev et al. We find in agreement with Drukarev et al. that the Q value of the decay is reduced by any atomic excitation …

New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs Open

M. Aker, D. Batzler, A. Beglarian, J. Behrens, A. I. Berlëv , et al. · 2022

We report on the direct cosmic relic neutrino background search from the first two science runs of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E …

Viterbi decoding of CRES signals in Project 8 Open

A. Ashtari Esfahani, Zachary Bogorad, S. Böser, N. Buzinsky, C. Claessens , et al. · 2022

Cyclotron radiation emission spectroscopy (CRES) is a modern approach for determining charged particle energies via high-precision frequency measurements of the emitted cyclotron radiation. For CRES experiments with gas within the fiducial…

Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign Open

M. Aker, D. Batzler, A. Beglarian, J. Behrens, A. I. Berlëv , et al. · 2022

We present the results of the light sterile neutrino search from the second Karlsruhe Tritium Neutrino (KATRIN) measurement campaign in 2019. Approaching nominal activity, 3.76×106 tritium β-electrons are analyzed in an energy window exten…

White Paper on Light Sterile Neutrino Searches and Related Phenomenology Open

M. A. Acero, C. Argüelles, Matheus Hostert, D. Kalra, G. Karagiorgi , et al. · 2022

This white paper provides a comprehensive review of our present understanding of experimental neutrino anomalies that remain unresolved, charting the progress achieved over the last decade at the experimental and phenomenological level, an…

An active transverse energy filter to differentiate low energy particles with large pitch angles in a strong magnetic field Open

K. Gauda, S. Schneidewind, G. Drexlin, A. Fulst, V. Hannen , et al. · 2022

We present the idea and proof of principle measurements for an angular-selective active filter for charged particles. The motivation for the setup arises from the need to distinguish background electrons from signal electrons in a spectrom…

Direct neutrino-mass measurement with sub-electronvolt sensitivity Open

M. Aker, A. Beglarian, J. Behrens, A. Berlev, U. Besserer , et al. · 2022

Analysis methods for the first KATRIN neutrino-mass measurement Open

M. Aker, K. Altenmüller, A. Beglarian, J. Behrens, A. I. Berlëv , et al. · 2021

We report on the dataset, data handling, and detailed analysis techniques of the first neutrino-mass measurement by the Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes the absolute neutrino-mass scale via the β-decay kinematic…

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