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

Hammann, R.; Barth, A.; Fleischmann, Andreas; Schulz, Dieter; Gastaldo, L.

doi:10.1140/epjc/s10052-021-09763-9

Cited by 2 publications

(2 citation statements)

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“…At this point, we would like to note that a more precise shape of the unresolved pile-up spectrum depends on the data reduction algorithm, in particular in relation to pulse shape analysis, which might be more suitable to discriminate pileup events when the second events have energies above a few hundred eV, as described in [11].…”

Section: Unresolved Pile-upmentioning

confidence: 99%

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Study of naturally occurring radionuclides in the ECHo set-up

et al. 2022

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The determination of the effective electron neutrino mass by analyzing the end point region of the $$^{163}$$ 163 Ho electron capture (EC) spectrum relies on the precise description of the expected $$^{163}$$ 163 Ho events and background events. In the ECHo experiment, arrays of metallic magnetic calorimeters, implanted with $$^{163}$$ 163 Ho, are operated to measure the $$^{163}$$ 163 Ho EC spectrum. In an energy range of 10 eV below $$Q_{\mathrm {EC}}$$ Q EC , the maximum available energy for the EC decay of about 2.8 keV, a $$^{163}$$ 163 Ho event rate of the order of $$10^{-4}$$ 10 - 4 day$$^{-1}$$ - 1 pixel$$^{-1}$$ - 1 is expected for an activity of 1 Bq of $$^{163}$$ 163 Ho per pixel. This means, a control of the background level in the order of $$10^{-5}$$ 10 - 5 day$$^{-1}$$ - 1 pixel$$^{-1}$$ - 1 is extremely important. We discuss the results of a Monte Carlo study based on simulations, which use the GEANT4 framework to understand the impact of natural radioactive isotopes close to the active detector volume in the case of the ECHo-1k set-up, which is used for the first phase of the ECHo experiment. For this, the ECHo-1k set-up was modeled in GEANT4 using the proper geometry and materials, including the information of screening measurements of some materials used in the ECHo-1k set-up and reasonable assumptions. Based on the simulation and on assumptions, we derive the expected background around $$Q_{\mathrm {EC}}$$ Q EC and give upper limits of tolerable concentrations of natural radionuclides in the set-up materials. In addition, we compare our results to background spectra acquired in detector pixels with and without implanted $$^{163}$$ 163 Ho. We conclude that typical concentration of radioactive nuclides found in the used materials should not endanger the analysis of the endpoint region of the $$^{163}$$ 163 Ho EC spectrum for an exposure time of half a year.

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Section: Unresolved Pile-upmentioning

confidence: 99%

“…Electromagnetic noise can couple to the readout chain of the detectors, resulting in additional background signals. These events can easily be rejected with an efficiency of almost 100 % based on their trigger time information [11].…”

Section: Electromagnetic Noisementioning

confidence: 99%

Study of naturally occurring radionuclides in the ECHo set-up

et al. 2022

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Neutrino Mass Measurements Using Cryogenic Detectors

Gastaldo

2022

J Low Temp Phys

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The determination of the absolute mass scale of neutrinos is one of the most important challenges in Particle Physics. The shape of the endpoint region of $$\beta ^-$$ β - -decay and electron capture (EC) spectra depends on the phase space factor, which, in turn, is function of the masses of the neutrino mass eigenstates. High energy resolution and high statistics measurements of $$\beta ^-$$ β - and EC spectra are therefore considered a model-independent way for the determination of the neutrino mass scale. Since almost four decades, low temperature microcalorimeters are used for the measurement of low energy $$\beta ^-$$ β - and EC spectra. The first efforts were focused on the development of large arrays for the measurement of the $$^{187}$$ 187 Re $$\beta ^-$$ β - -spectrum. In the last ten years, the attention moved to EC of $$^{163}$$ 163 Ho. This choice was mainly motivated by the very good performance which could be achieved with low temperature microcalorimeters enclosing $$^{163}$$ 163 Ho with respect to microcalorimeters with absorber containing $$^{187}$$ 187 Re. The development of low temperature microcalorimeters for the measurement of the finite neutrino mass is discussed and, in particular, the reasons for moving from $$^{187}$$ 187 Re to $$^{163}$$ 163 Ho. The possibility to reach sub-eV sensitivity on the effective electron neutrino mass with $$^{163}$$ 163 Ho, thanks to the multiplexing of large microcalorimeter arrays is demonstrated. In conclusion, an overview on other nuclides which have been proposed as good candidates, motivated by the excellent performance of low temperature microcalorimeters is presented.

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

Abstract: The 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 … Show more

Cited by 2 publications

References 20 publications

Study of naturally occurring radionuclides in the ECHo set-up

Study of naturally occurring radionuclides in the ECHo set-up

Neutrino Mass Measurements Using Cryogenic Detectors

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