Metallic magnetic calorimeter arrays for the first phase of the ECHo experiment

Mantegazzini, F.; Barth, A.; Dorrer, Holger; Düllmann, Ch. E.; Enss, C.; Fleischmann, A.; Hammann, R.; Kempf, Sebastian; Kieck, T.; Kovac, N.; Velte, C.; Wegner, M.; Wendt, Κ.; Wickenhäuser, T.; Gastaldo, L.

doi:10.1016/j.nima.2022.166406

Cited by 10 publications

(19 citation statements)

References 25 publications

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“…With an acceleration potential around 30 kV, the implantation volume in the absorber is well-defined allowing for a safe dimensioning of the first absorber layer, where the ions are implanted, and second absorber layer, which covers the implantation area. The ECHo collaboration has demonstrated that detectors having implanted 163 Ho in the absorbers have not degraded performance and that the fabrication of the absorbers is reliable [30,39]. While the first 163 Ho implantation processes for the ECHo experiment have been performed at ISOLDE-CERN [40], more recent implantation processes have been performed at the RISIKO facility at Mainz University which has been optimized to perfectly suite the requirements for 163 Ho implantation in arrays of MMCs [41,42].…”

Section: Re Based Experimentsmentioning

confidence: 99%

“…The ECHo collaboration has optimized the MMC design with 163 Ho loaded absorbers over the last ten years, demonstrating that energy resolution of a few eV FWHM can be obtained with detectors having about 1 Bq of 163 Ho activity [30,39,44,45] and has been developing a microwave multiplexing design optimized for MMC features [46,47]. After the first proof of concept phase which brought to the publication of a new limit for the effective electron neutrino mass of 150 eV [6], improving after about 30 year the limit obtained by Springer et al with the measurement of the x-ray spectrum of 163 Ho [48], the ECHo collaboration has completed in 2020 the data acquisition for the ECHo-1k phase of the experiment collecting about 10 8 163 Ho events.…”

Section: Re Based Experimentsmentioning

confidence: 99%

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Neutrino mass measurements using cryogenic detectors

Gastaldo

2022

Preprint

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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 β -decay and electron capture (EC) spectra depends on the phase space factor, which, in turn, is function of the neutrino mass eigenstates. High energy resolution and high statistics measurements of 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 β -and EC spectra. The first efforts were focused on the development of large arrays for the measurement of the 187 Re β -spectrum. In the last ten years, the attention moved to EC of 163 Ho. This choice was mainly motivated by the very good performance which could be achieved with low temperature microcalorimeters enclosing 163 Ho with respect to microcalorimeters with absorber containing 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 Re to 163 Ho. The possibility to reach sub-eV sensitivity on the effective electron neutrino mass with 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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Section: Re Based Experimentsmentioning

confidence: 99%

Section: Re Based Experimentsmentioning

confidence: 99%

Neutrino mass measurements using cryogenic detectors

Gastaldo

2022

Preprint

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“…The ECHo collaboration has demonstrated that detectors having implanted 163 Ho in the absorbers have not degraded performance and that the fabrication of the absorbers is reliable [33,43]. While the first 163 Ho implantation processes for the ECHo experiment have been performed at ISOLDE-CERN [44], more recent implantation processes have been performed at the RISIKO facility at Mainz University which has been optimized to perfectly suit the requirements for 163 Ho implantation in arrays of MMCs [45,46].…”

Section: Ho Based Experimentsmentioning

confidence: 99%

“…The ECHo collaboration has optimized the MMC design with 163 Ho loaded absorbers over the last ten years, demonstrating a continuous improvement in the performance [33,43,48] and recently reaching an energy resolution of a few eV FWHM with detectors having about 1 Bq of 163 Ho activity [49]. In addition, a microwave multiplexing design optimized for MMC features has been developed and first promising results have been obtained [50,51].…”

Section: Ho Based Experimentsmentioning

confidence: 99%

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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“…and it was obtained by the ECHo collaboration with a preliminary calorimetric measurement of the 163 Ho EC spectrum [3]. During the first phase of the experiment, ECHo-1k, a dedicated 72-pixel detector array based on metallic magnetic calorimeters (MMCs) [4] has been developed and characterised [5] and a high-statistics spectrum with about 10 8 163 Ho EC events has been acquired. With the on-going data analysis a new limit below 20 eV on the effective electron neutrino mass will be set.…”

Section: Introductionmentioning

confidence: 99%

Development and characterisation of high-resolution microcalorimeter detectors for the ECHo-100k experiment

Mantegazzini¹,

Kovac²,

Enss³

et al. 2023

Preprint

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The goal of the ECHo experiment is a direct determination of the absolute scale of the neutrino mass by the analysis of the end-point region of the 163 Ho electron capture (EC) spectrum. The results of the first phase of the experiment, ECHo-1k, have paved the way for the current phase, ECHo-100k, which aims at a sensitivity below 2 eV on the effective electron neutrino mass. In order to reach this goal, a new generation of high-resolution magnetic microcalorimeters with embedded 163 Ho have been developed and characterised. The design has been optimised to meet all the challenging requirements of the ECHo-100k experimental phase, such as excellent energy resolution, wafer scale implantation and multi-chip operation with multiplexing read-out. We present the optimisation studies, the final design of the detector array and the first characterisation studies. The results demonstrate that the detectors fully match and even surpass the requirements for the current experimental phase, ECHo-100k.

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Metallic magnetic calorimeter arrays for the first phase of the ECHo experiment

Cited by 10 publications

References 25 publications

Neutrino mass measurements using cryogenic detectors

Neutrino mass measurements using cryogenic detectors

Neutrino Mass Measurements Using Cryogenic Detectors

Development and characterisation of high-resolution microcalorimeter detectors for the ECHo-100k experiment

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