This work summarizes the current status of HOLMES, a calorimetric experiment for the direct neutrino mass measurement. The state-of-the-art in this field is represented by the KATRIN spectrometer that is under data-taking aiming at a sensitivity of 0.2 eV. HOLMES will prove the feasibility of the calorimetric approach, that is an alternative method to the spectrometric one. HOLMES detectors are Transition Edge Sensors in which a source of 163Ho will be ion-implanted. These microcalorimeters allow a multiplexed readout and ensure high energy and time resolutions. 163Ho is an interesting candidate for the direct neutrino mass determination. In fact, the low Q-value (∼2.83 keV) of its electron capture decay increases the fraction of useful events in the region close to the end-point. HOLMES will assess mν by analyzing the spectrum deformation due to a non-zero mν. This contribution describes the detector working principles, their fabrication for HOLMES and their characterization. At the same time, a focus on the ion-implantation is given together with the latest results from its tests. HOLMES is now close to the first low-dose measurement. By implanting a small 163Ho activity per detector it will be possible to fine-tune the entire experimental procedure and also to analyze a preliminary spectrum in order to assess an initial upper limit on mν of about ∼ 10 eV.

Origo, L., Alpert, B., Balata, M., Becker, D., Bennett, D., Bevilacqua, A., et al. (2023). The status of the HOLMES experiment. In 41st International Conference on High Energy Physics, ICHEP 2022. Sissa Medialab Srl [10.22323/1.414.0625].

The status of the HOLMES experiment

Origo L.
;
Borghesi M.;Faverzani M.;Ferri E.;Giachero A.;Labranca D.;Moretti R.;Nucciotti A.;Pessina G.;Ragazzi S.;
2023

Abstract

This work summarizes the current status of HOLMES, a calorimetric experiment for the direct neutrino mass measurement. The state-of-the-art in this field is represented by the KATRIN spectrometer that is under data-taking aiming at a sensitivity of 0.2 eV. HOLMES will prove the feasibility of the calorimetric approach, that is an alternative method to the spectrometric one. HOLMES detectors are Transition Edge Sensors in which a source of 163Ho will be ion-implanted. These microcalorimeters allow a multiplexed readout and ensure high energy and time resolutions. 163Ho is an interesting candidate for the direct neutrino mass determination. In fact, the low Q-value (∼2.83 keV) of its electron capture decay increases the fraction of useful events in the region close to the end-point. HOLMES will assess mν by analyzing the spectrum deformation due to a non-zero mν. This contribution describes the detector working principles, their fabrication for HOLMES and their characterization. At the same time, a focus on the ion-implantation is given together with the latest results from its tests. HOLMES is now close to the first low-dose measurement. By implanting a small 163Ho activity per detector it will be possible to fine-tune the entire experimental procedure and also to analyze a preliminary spectrum in order to assess an initial upper limit on mν of about ∼ 10 eV.
paper
Calorimetric approach; Current status; Higher time resolution; Ion implanted; Mass measurements; Micro-calorimeters; Neutrino mass; Spectra's; State of the art; Transition-edge sensors
English
41st International Conference on High Energy Physics, ICHEP 2022 - 6 July 2022 through 13 July 2022
2022
41st International Conference on High Energy Physics, ICHEP 2022
2023
414
625
https://pos.sissa.it/414/
none
Origo, L., Alpert, B., Balata, M., Becker, D., Bennett, D., Bevilacqua, A., et al. (2023). The status of the HOLMES experiment. In 41st International Conference on High Energy Physics, ICHEP 2022. Sissa Medialab Srl [10.22323/1.414.0625].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/477863
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