scholarly journals First direct neutrino-mass measurement with sub-eV sensitivity

2021 ◽  
Author(s):  
M. Aker ◽  
M. Bottcher ◽  
A. Beglarian ◽  
J. Behrens ◽  
A. Berlev ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Precision Measurement ◽  
Mass Measurement ◽  
Β Decay ◽  
High Precision Measurement ◽  
Effective Electron ◽  
Upper Limit ◽  
Neutrino Mass Measurement ◽  
Katrin Experiment ◽  
Best Fit

Abstract We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, mν, via a high-precision measurement of the tritium β-decay spectrum close to its endpoint at 18.6 keV. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by 25% with respect to the first campaign. A sensitivity on mν of 0.7 eV/c2 at 90% confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields mν2=(0.26±0.34) eV2/c4, resulting in an upper limit of mν<0.9 eV/c2 (90% CL). By combining this result with the first neutrino mass campaign, we find an upper limit of mν<0.8 eV/c2 (90% CL).

scholarly journals Precision measurement of the electron energy-loss function in tritium and deuterium gas for the KATRIN experiment

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
M. Aker ◽  
A. Beglarian ◽  
J. Behrens ◽  
A. Berlev ◽  
U. Besserer ◽  
...  
Keyword(s):  
Energy Loss ◽  
Neutrino Mass ◽  
Loss Function ◽  
Precision Measurement ◽  
Measurement Data ◽  
Gas Mixture ◽  
Systematic Effect ◽  
Effective Electron ◽  
Energy Loss Function ◽  
Katrin Experiment

AbstractThe KATRIN experiment is designed for a direct and model-independent determination of the effective electron anti-neutrino mass via a high-precision measurement of the tritium $$\upbeta $$ β -decay endpoint region with a sensitivity on $$m_\nu $$ m ν of 0.2 $$\hbox {eV}/\hbox {c}^2$$ eV / c 2 (90% CL). For this purpose, the $$\upbeta $$ β -electrons from a high-luminosity windowless gaseous tritium source traversing an electrostatic retarding spectrometer are counted to obtain an integral spectrum around the endpoint energy of 18.6 keV. A dominant systematic effect of the response of the experimental setup is the energy loss of $$\upbeta $$ β -electrons from elastic and inelastic scattering off tritium molecules within the source. We determined the energy-loss function in-situ with a pulsed angular-selective and monoenergetic photoelectron source at various tritium-source densities. The data was recorded in integral and differential modes; the latter was achieved by using a novel time-of-flight technique. We developed a semi-empirical parametrization for the energy-loss function for the scattering of 18.6-keV electrons from hydrogen isotopologs. This model was fit to measurement data with a 95% $$\hbox {T}_2$$ T 2 gas mixture at 30 K, as used in the first KATRIN neutrino-mass analyses, as well as a $$\hbox {D}_2$$ D 2 gas mixture of 96% purity used in KATRIN commissioning runs. The achieved precision on the energy-loss function has abated the corresponding uncertainty of $$\sigma (m_\nu ^2)< {{10}^{-2}}{\hbox {eV}^{2}}$$ σ ( m ν 2 ) < 10 - 2 eV 2 [1] in the KATRIN neutrino-mass measurement to a subdominant level.

High precision measurement of the tritium β spectrum near its endpoint and upper limit on the neutrino mass

1999 ◽  
Vol 460 (1-2) ◽  
pp. 219-226 ◽  
Author(s):  
Ch. Weinheimer ◽  
B. Degenddag ◽  
A. Bleile ◽  
J. Bonn ◽  
L. Bornschein ◽  
...  
Keyword(s):  
High Precision ◽  
Neutrino Mass ◽  
Precision Measurement ◽  
High Precision Measurement ◽  
Upper Limit

A second generation experiment for direct neutrino mass measurement via 187Re β-decay

2005 ◽  
Vol 143 ◽  
pp. 541
Author(s):  
G. Gatti ◽  
G. Gallinaro ◽  
D. Pergolesi ◽  
L. Gastaldo ◽  
S. Dussoni ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Second Generation ◽  
Mass Measurement ◽  
Β Decay ◽  
Neutrino Mass Measurement

scholarly journals The Neutrino Mass Experiment KATRIN

2019 ◽  
Vol 64 (7) ◽  
pp. 573
Author(s):  
F. M. Fraenkle
Keyword(s):  
Neutrino Mass ◽  
Large Scale ◽  
Mass Measurement ◽  
Current Status ◽  
Effective Electron ◽  
Segmented Detector ◽  
Decay Spectroscopy ◽  
Gaseous Tritium ◽  
Scale Experiment ◽  
Katrin Experiment

The KArlsruhe TRItium Neutrino (KATRIN) experiment is a large-scale experiment with the objective to determine the effective electron antineutrino mass in a model-independent way with an unprecedented sensitivity of 0.2 eV/c2 at 90% C.L. The measurement method is based on the precision B-decay spectroscopy of molecular tritium. The experimental setup consists of a high-luminosity windowless gaseous tritium source, a magnetic electron transport system with differential cryogenic pumping for the tritium retention, and an electrostatic spectrometer section for the energy analysis, followed by a segmented detector system for the counting of transmitted B-electrons. The first KATRIN neutrino mass measurement phase started in March 2019. Here, we will give an overview of the KATRIN experiment and its current status.

Microbolometers for high resolution x-ray spectroscopy and neutrino mass measurement

2000 ◽  
Vol 85 (1-3) ◽  
pp. 280-283
Author(s):  
A Monfardini ◽  
A Alessandrello ◽  
J.W Beeman ◽  
C Brofferio ◽  
O Cremonesi ◽  
...  
Keyword(s):  
High Resolution ◽  
Neutrino Mass ◽  
Mass Measurement ◽  
X Ray ◽  
Neutrino Mass Measurement

Corrections to the tritium β decay spectrum arising from radiative and atomic effects and their relationship to neutrino mass experiments

1989 ◽  
Vol 67 (9) ◽  
pp. 904-911 ◽  
Author(s):  
S. Weisnagel ◽  
J. Law
Keyword(s):  
Neutrino Mass ◽  
Reference Spectrum ◽  
Β Decay ◽  
Final Density ◽  
Original Analysis ◽  
Sample Data ◽  
Inner Bremsstrahlung ◽  
The Difference ◽  
Best Fit ◽  
Neutrino Decay

The process of inner bremsstrahlung is examined for the β− decay of 3H. These radiative effects are then combined with atomic corrections in a more complete theoretical reference spectrum consisting of both light and heavy neutrino decay in accordance with recently published results of neutrino mass experiments. Due to the unusual nature of the experimental detector, final density of states is modified to provide a decay rate as a function of recorded energy. This reference spectrum is compared with experimental data using the exact method employed in the original analysis. It is found that previously reported low energy Kurie spectrum deviations are still present in the sample data, corresponding to a best fit for neutrino mass mν = 17.2 keV and mixing probability R = 2.5%. The origin of the difference between the conclusions reached here and those of earlier cited works is briefly discussed.

scholarly journals Development of Microwave Superconducting Microresonators for Neutrino Mass Measurement in the Holmes Framework

2016 ◽  
Vol 184 (1-2) ◽  
pp. 123-130 ◽  
Author(s):  
A. Giachero ◽  
P. K. Day ◽  
P. Falferi ◽  
M. Faverzani ◽  
E. Ferri ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Mass Measurement ◽  
Neutrino Mass Measurement
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