Conversion of experimental half-life to effective electron neutrino mass in0νββdecay

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
Anatoly Smolnikov ◽  
Peter Grabmayr
Keyword(s):  
Neutrino Mass ◽  
Half Life ◽  
Electron Neutrino ◽  
Effective Electron

scholarly journals Data reduction for a calorimetrically measured $$^{163}\mathrm {Ho}$$ spectrum of the ECHo-1k experiment

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Robert Hammann ◽  
Arnulf Barth ◽  
Andreas Fleischmann ◽  
Dennis Schulz ◽  
Loredana Gastaldo
Keyword(s):  
Electron Capture ◽  
Neutrino Mass ◽  
Data Reduction ◽  
Time Profile ◽  
Electron Neutrino ◽  
Effective Electron ◽  
Trigger Time ◽  
Pile Up ◽  
Time Information

AbstractThe electron capture in $$^{163}\mathrm {Ho}$$ 163 Ho experiment (ECHo) is designed to directly measure the effective electron neutrino mass by analysing the endpoint region of the $$^{163}\mathrm {Ho}$$ 163 Ho electron capture spectrum. We present a data reduction scheme for the analysis of high statistics data acquired with the first phase of the ECHo experiment, ECHo-1k, to reliably infer the energy of $$^{163}\mathrm {Ho}$$ 163 Ho events and discard triggered noise or pile-up events. On a first level, the raw data is filtered purely based on the trigger time information of the acquired signals. On a second level, the time profile of each triggered event is analysed to identify the signals corresponding to a single energy deposition in the detector. We demonstrate that events not belonging to this category are discarded with an efficiency above 99.8%, with a minimal loss of $$^{163}\mathrm {Ho}$$ 163 Ho events of about 0.7%. While the filter using the trigger time information is completely energy independent, a slight energy dependence of the filter based on the time profile is precisely characterised. This data reduction protocol will be important to minimise systematic errors in the analysis of the $$^{163}\mathrm {Ho}$$ 163 Ho spectrum for the determination of the effective electron neutrino mass.

scholarly journals High-resolution and low-background $$^{163}$$Ho spectrum: interpretation of the resonance tails

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
C. Velte ◽  
F. Ahrens ◽  
A. Barth ◽  
K. Blaum ◽  
M. Braß ◽  
...  
Keyword(s):  
Electron Capture ◽  
Neutrino Mass ◽  
Line Shape ◽  
High Energy ◽  
Electron Neutrino ◽  
High Energy Resolution ◽  
Precise Description ◽  
Effective Electron ◽  
Low Background ◽  
The Impact

AbstractThe determination of the effective electron neutrino mass via kinematic analysis of beta and electron capture spectra is considered to be model-independent since it relies on energy and momentum conservation. At the same time the precise description of the expected spectrum goes beyond the simple phase space term. In particular for electron capture processes, many-body electron-electron interactions lead to additional structures besides the main resonances in calorimetrically measured spectra. A precise description of the $$^{163}$$163Ho spectrum is fundamental for understanding the impact of low intensity structures at the endpoint region where a finite neutrino mass affects the shape most strongly. We present a low-background and high-energy resolution measurement of the $$^{163}$$163Ho spectrum obtained in the framework of the ECHo experiment. We study the line shape of the main resonances and multiplets with intensities spanning three orders of magnitude. We discuss the need to introduce an asymmetric line shape contribution due to Auger–Meitner decay of states above the auto-ionisation threshold. With this we determine an enhancement of count rate at the endpoint region of about a factor of 2, which in turn leads to an equal reduction in the required exposure of the experiment to achieve a given sensitivity on the effective electron neutrino mass.

scholarly journals Quantitative Long-Term Monitoring of the Circulating Gases in the KATRIN Experiment Using Raman Spectroscopy

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4827 ◽  
Author(s):  
Max Aker ◽  
Konrad Altenmüller ◽  
Armen Beglarian ◽  
Jan Behrens ◽  
Anatoly Berlev ◽  
...  
Keyword(s):  
Neutrino Mass ◽  
Electron Neutrino ◽  
Effective Electron ◽  
Term Operation ◽  
Laser Raman ◽  
Gaseous Tritium ◽  
Order Of Magnitude ◽  
Recording Analysis ◽  
Katrin Experiment

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c2, i.e., improving on previous measurements by an order of magnitude. Neutrino mass data taking with KATRIN commenced in early 2019, and after only a few weeks of data recording, analysis of these data showed the success of KATRIN, improving on the known neutrino mass limit by a factor of about two. This success very much could be ascribed to the fact that most of the system components met, or even surpassed, the required specifications during long-term operation. Here, we report on the performance of the laser Raman (LARA) monitoring system which provides continuous high-precision information on the gas composition injected into the experiment’s windowless gaseous tritium source (WGTS), specifically on its isotopic purity of tritium—one of the key parameters required in the derivation of the electron neutrino mass. The concentrations cx for all six hydrogen isotopologues were monitored simultaneously, with a measurement precision for individual components of the order 10−3 or better throughout the complete KATRIN data taking campaigns to date. From these, the tritium purity, εT, is derived with precision of <10−3 and trueness of <3 × 10−3, being within and surpassing the actual requirements for KATRIN, respectively.

scholarly journals Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future1

2016 ◽  
Vol 3 (1) ◽  
pp. 73-113 ◽  
Author(s):  
Otokar Dragoun ◽  
Drahoslav Vénos
Keyword(s):  
Neutrino Mass ◽  
Sterile Neutrino ◽  
Electron Neutrino ◽  
Neutrino Masses ◽  
Effective Electron ◽  
Upper Limit ◽  
Cosmological Observations ◽  
Two Generations ◽  
Experimental Approaches ◽  
The Universe

Although neutrinos are probably the most abundant fermions of the universe their mass is not yet known. Oscillation experiments have proven that at least one of the neutrino mass states hasmi> 0.05 eV while various interpretations of cosmological observations yielded an upper limit for the sum of neutrino masses ∑mi< (0.14 ‒ 1.7) eV. The searches for the yet unobserved 0νββ decay result in an effective neutrino massmββ< (0.2 ‒ 0.7) eV. The analyses of measured tritium β-spectra provide an upper limit for the effective electron neutrino massm(ve) < 2 eV. In this review, we summarize the experience of two generations of β-ray spectroscopists who improved the upper limit ofm(ve) by three orders of magnitude. We describe important steps in the development of radioactive sources and electron spectrometers, and recapitulate the lessons from now-disproved claims for the neutrino mass of 30 eV and the 17 keV neutrino with an admixture larger than 0.03%. We also pay attention to new experimental approaches and searches for hypothetical sterile neutrinos.

scholarly journals Perturbation to TBM mixing and its phenomenological implications

2016 ◽  
Vol 31 (38) ◽  
pp. 1650207 ◽  
Author(s):  
M. Sruthilaya ◽  
Srinu Gollu
Keyword(s):  
Neutrino Mass ◽  
Mass Formula ◽  
Electron Neutrino ◽  
Leading Order ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Neutrino Sector ◽  
Upper Limit ◽  
Mixing Matrix ◽  
Reactor Mixing

To accommodate the recently observed nonzero reactor mixing angle [Formula: see text], we consider the lepton mixing matrix as tri-bimaximal mixing (TBM) form in the leading order along with a perturbation in neutrino sector. The perturbation is taken to be a rotation in 23 plane followed by a rotation in 13 plane, i.e. [Formula: see text]. We obtain the allowed values of the parameters [Formula: see text], [Formula: see text] and [Formula: see text], which can accommodate all the observed mixing angles consistently and calculate the phenomenological observables such as the Dirac CP violating phase [Formula: see text], Jarlskog invariant [Formula: see text], effective Majorana mass [Formula: see text] and [Formula: see text], the electron neutrino mass. We find that [Formula: see text] can take any values between [Formula: see text] and [Formula: see text] and [Formula: see text] always comes below its experimental upper limit.

scholarly journals Interpolating formula for the 0νββ -decay half-life in the case of light and heavy neutrino mass mechanisms

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
A. Babič ◽  
S. Kovalenko ◽  
M. I. Krivoruchenko ◽  
F. Šimkovic
Keyword(s):  
Neutrino Mass ◽  
Half Life ◽  
Heavy Neutrino

scholarly journals Latest Results from the T2K Neutrino Experiment

Universe ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 21
Author(s):  
Dean Karlen ◽  
on behalf of the TtwoK Collaboration
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Electron Neutrino ◽  
Muon Neutrino ◽  
Neutrino Experiment ◽  
Long Baseline ◽  
Neutrino Oscillation Experiment ◽  
Electron Neutrino Appearance ◽  
Oscillation Experiment

The T2K long baseline neutrino oscillation experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and anti-neutrino beams. This presentation reports on the analysis of our data from an exposure of 2 . 6 × 10 21 protons on target. Results for oscillation parameters, including the CP violation parameter and neutrino mass ordering, are shown.

scholarly journals Characterization of the Ho163 Electron Capture Spectrum: A Step Towards the Electron Neutrino Mass Determination

2017 ◽  
Vol 119 (12) ◽  
Author(s):  
P. C.-O. Ranitzsch ◽  
C. Hassel ◽  
M. Wegner ◽  
D. Hengstler ◽  
S. Kempf ◽  
...  
Keyword(s):  
Electron Capture ◽  
Neutrino Mass ◽  
Electron Neutrino ◽  
Mass Determination
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