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

Göggelmann, A.; Jochum, J.; Gastaldo, L.; Velte, C.; Mantegazzini, F.

doi:10.1140/epjc/s10052-021-09148-y

Cited by 7 publications

(9 citation statements)

References 16 publications

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“…Thus, muons can deposit energy directly in the MMCs and/or can generate secondary radiation, which can interact with the detector pixels. It was shown that these types of events can either be recognized with the use of an active muon veto, by searching for coincidence among pixels events and by their pulse shape [12]. Out of 242 ± 20 measured pixel-veto coincidences, 194 ± 12 events were also coincidences among pixels, leading to an efficiency of about (80 ± 8) % of detecting muon induced events by searching for coincidence among pixels.…”

Section: Muonsmentioning

confidence: 99%

“…The pulse shape analysis is based on the analysis developed to recognize muon induced events [12,38] and modified to select 163 Ho-like events. Five parameters are obtained from each pulse, its integral, rise time and amplitude on the one hand, and on the other hand, the pulse is compared to a template and is correlated with the same template.…”

Section: Upper Limitsmentioning

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: Muonsmentioning

confidence: 99%

Section: Upper Limitsmentioning

confidence: 99%

Study of naturally occurring radionuclides in the ECHo set-up

et al. 2022

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“…Monte Carlos simulations are used in order to understand the radiation emitting contaminants in the used material, as well as to understand the effects of cosmogenic muon generated events in the region of interest (ROI). This information, combined with the material screening, is then used to obtain a background model that is then used in the analysis of the background spectrum [11].…”

Section: Background Suppressionmentioning

confidence: 99%

The Electron Capture in 163 Ho Experiment - a Short Update

Kovac¹,

Gastaldo²,

Ahrens³

et al. 2022

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021)

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The definition of the absolute neutrino mass scale is one of the main goals of the Particle Physics today. The study of the end-point regions of the βand electron capture (EC) spectrum offers a possibility to determine the effective electron (anti-)neutrino mass in a completely model independent way, as it only relies on the energy and momentum conservation. The ECHo (Electron Capture in 163 Ho) experiment has been designed in the attempt to measure the effective mass of the electron neutrino by performing high statistics and high energy resolution measurements of the 163 Ho electron capture spectrum. To achieve this goal, large arrays of low temperature metallic magnetic calorimeters (MMCs) implanted with with 163 Ho are used. Here we report on the structure and the status of the experiment.

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“…Along this line, a search for coincident events among different detector channels allows to identify events part of these muon related events. A study of the spectrum of muons and muon-related events in the region of interest is discussed in [13].…”

Section: External Spurious Signalsmentioning

confidence: 99%

“…the fraction of muon-induced signals that produce a signal in at least two pixels. In [13], a measurement with muon veto was described for 64 pixel-days. A total of 242 ± 20 pixel-veto coincidences and 194 ± 12 pixelpixel-veto coincidences were measured.…”

Section: Background Rejection Efficiencymentioning

confidence: 99%

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

et al. 2021

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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 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.

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

Cited by 7 publications

References 16 publications

Study of naturally occurring radionuclides in the ECHo set-up

Study of naturally occurring radionuclides in the ECHo set-up

The Electron Capture in 163 Ho Experiment - a Short Update

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

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