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.

Determination of the Electron Neutrino Mass from Experiments on Electron-Capture Beta-Decay

1982 ◽  
Author(s):  
B. Jonson ◽  
J. U. Andersen ◽  
G. J. Beyer ◽  
G. Charpak ◽  
A. De Rújula ◽  
...  
Keyword(s):  
Electron Capture ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Electron Neutrino

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 Determination of the electron-neutrino mass from experiments on electron-capture beta decay

1983 ◽  
Vol 396 ◽  
pp. 479-493 ◽  
Author(s):  
B. Jonson ◽  
J.U. Andersen ◽  
G.J. Beyer ◽  
G. Charpak ◽  
A. De Rújula ◽  
...  
Keyword(s):  
Electron Capture ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Electron Neutrino

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

scholarly journals Study of muon-induced background in MMC detector arrays for the ECHo experiment

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
A. Göggelmann ◽  
J. Jochum ◽  
L. Gastaldo ◽  
C. Velte ◽  
F. Mantegazzini
Keyword(s):  
Particle Physics ◽  
Region Of Interest ◽  
Electron Neutrino ◽  
Secondary Radiation ◽  
Common Source ◽  
Effective Electron ◽  
Detector Arrays ◽  
Cosmic Muons ◽  
Physics Experiments

AbstractFor above ground particle physics experiments, cosmic muons are common source of background, not only for direct detector hits, but also for secondary radiation created in neighboring materials. The ECHo experiment has been designed for the determination of the effective electron neutrino mass by the analysis of the endpoint region of the $$^{163}\text {Ho}$$ 163 Ho electron capture spectrum. The fraction of events occurring in the region of interest of 10 eV below the $$Q_{\mathrm {EC}}$$ Q EC value of about 2.8 keV is only of the order of $$10^{-9}$$ 10 - 9 . This means that the background in that region need to be studied, characterized and methods to suppress it need to be developed. We expect a major background contribution to be due to cosmic muons and radiation produced by muons traveling through material around the detectors. To determine the muon-related background in metallic magnetic calorimeters (MMCs) used in the ECHo experiment, we have performed an experiment in which a muon veto was installed around the cryostat used for the operation of the detectors. We analysed the acquired events to investigate the pulse shape of MMC events in coincidence with the muon veto and the rate of multiple coincidences among detector array pixels. With different methods used for identification of muon related events, we studied events generated by muons and secondary radiation depositing energy in the substrate close to the ECHo pixels. In addition, energy depositions of muons and secondary radiation in the detectors was studied via Monte Carlo simulation. At the present status of investigation, we conclude that muon related events will be a negligible background in the region of interest of the $$^{163}\text {Ho}$$ 163 Ho spectrum.

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.

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