Improved limit on the effective electron neutrino mass with the ECHo-1k experiment
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arXiv
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| Format: | Preprint |
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2025
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| author | Adam, Fabienne Ahrens, Felix Perez, Luis E. Ardila Balzer, Matthias Barth, Arnulf Behrend-Uriarte, Daniel Berndt, Sebastian Blaum, Klaus Böhm, Frederic W. H. Braß, Martin Calza, Lorenzo Chrysalidis, Katerina Door, Menno Dorrer, Holger Düllmann, Christoph E. Eberhardt, Klaus Eliseev, Sergey Enss, Christian Filianin, Pavel Fleischmann, Andreas Gartmann, Robert Gastaldo, Loredana Griedel, Markus Göggelmann, Alexander Hammann, Robert Hasse, Raphael Haverkort, Maurits W. Heinze, Simon Hengstler, Daniel Jeske, Rasmus Jochum, Josef Johnston, Karl Karcher, Nick Kempf, Sebastian Kieck, Tom Köster, Ulli Kovac, Neven Kneip, Nina Kromer, Kathrin Mantegazzini, Federica Marsh, Bruce A. Merstof, Marc Muscheid, Timo Neidig, Martin Novikov, Yuri N. Pandey, Raghav Reifenberger, Andreas Richter, Daniel Rischka, Alexander Rothe, Sebastian Sander, Oliver Schüssler, Rima X. Scholl, Stephan Schweiger, Christoph Velte, Clemens Weber, Marc Wegner, Matthias Wendt, Klaus Wickenhäuser, Tom |
| author_facet | Adam, Fabienne Ahrens, Felix Perez, Luis E. Ardila Balzer, Matthias Barth, Arnulf Behrend-Uriarte, Daniel Berndt, Sebastian Blaum, Klaus Böhm, Frederic W. H. Braß, Martin Calza, Lorenzo Chrysalidis, Katerina Door, Menno Dorrer, Holger Düllmann, Christoph E. Eberhardt, Klaus Eliseev, Sergey Enss, Christian Filianin, Pavel Fleischmann, Andreas Gartmann, Robert Gastaldo, Loredana Griedel, Markus Göggelmann, Alexander Hammann, Robert Hasse, Raphael Haverkort, Maurits W. Heinze, Simon Hengstler, Daniel Jeske, Rasmus Jochum, Josef Johnston, Karl Karcher, Nick Kempf, Sebastian Kieck, Tom Köster, Ulli Kovac, Neven Kneip, Nina Kromer, Kathrin Mantegazzini, Federica Marsh, Bruce A. Merstof, Marc Muscheid, Timo Neidig, Martin Novikov, Yuri N. Pandey, Raghav Reifenberger, Andreas Richter, Daniel Rischka, Alexander Rothe, Sebastian Sander, Oliver Schüssler, Rima X. Scholl, Stephan Schweiger, Christoph Velte, Clemens Weber, Marc Wegner, Matthias Wendt, Klaus Wickenhäuser, Tom |
| contents | The effective electron neutrino mass can be determined by analyzing the endpoint region of the $^{163}$Ho electron capture spectrum, provided a measurement with high energy resolution and high statistics using calorimetric techniques. Here, the Electron Capture in $^{163}$Ho collaboration, ECHo, presents an analysis of the most precise $^{163}$Ho spectrum currently available, obtained with the ECHo-1k experiment and comprising about 200 million events. A very low background rate of $B=9.1(1.3)\times 10^{-6}$ /eV/pixel/day was achieved allowing for a reliable analysis of the endpoint region. The derived endpoint energy $Q = 2862(4)$ eV is in excellent agreement with the one independently determined via Penning-trap mass spectrometry of $Q=2863.2(6)$ eV [1]. The upper limit of the effective electron neutrino mass is improved by almost a factor 2 compared to the lowest current value [2], reaching $m_{ν_\mathrm{e}} < 15 $ eV/c${^2}$ (90\% credible interval). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03423 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Improved limit on the effective electron neutrino mass with the ECHo-1k experiment Adam, Fabienne Ahrens, Felix Perez, Luis E. Ardila Balzer, Matthias Barth, Arnulf Behrend-Uriarte, Daniel Berndt, Sebastian Blaum, Klaus Böhm, Frederic W. H. Braß, Martin Calza, Lorenzo Chrysalidis, Katerina Door, Menno Dorrer, Holger Düllmann, Christoph E. Eberhardt, Klaus Eliseev, Sergey Enss, Christian Filianin, Pavel Fleischmann, Andreas Gartmann, Robert Gastaldo, Loredana Griedel, Markus Göggelmann, Alexander Hammann, Robert Hasse, Raphael Haverkort, Maurits W. Heinze, Simon Hengstler, Daniel Jeske, Rasmus Jochum, Josef Johnston, Karl Karcher, Nick Kempf, Sebastian Kieck, Tom Köster, Ulli Kovac, Neven Kneip, Nina Kromer, Kathrin Mantegazzini, Federica Marsh, Bruce A. Merstof, Marc Muscheid, Timo Neidig, Martin Novikov, Yuri N. Pandey, Raghav Reifenberger, Andreas Richter, Daniel Rischka, Alexander Rothe, Sebastian Sander, Oliver Schüssler, Rima X. Scholl, Stephan Schweiger, Christoph Velte, Clemens Weber, Marc Wegner, Matthias Wendt, Klaus Wickenhäuser, Tom High Energy Physics - Experiment Nuclear Experiment The effective electron neutrino mass can be determined by analyzing the endpoint region of the $^{163}$Ho electron capture spectrum, provided a measurement with high energy resolution and high statistics using calorimetric techniques. Here, the Electron Capture in $^{163}$Ho collaboration, ECHo, presents an analysis of the most precise $^{163}$Ho spectrum currently available, obtained with the ECHo-1k experiment and comprising about 200 million events. A very low background rate of $B=9.1(1.3)\times 10^{-6}$ /eV/pixel/day was achieved allowing for a reliable analysis of the endpoint region. The derived endpoint energy $Q = 2862(4)$ eV is in excellent agreement with the one independently determined via Penning-trap mass spectrometry of $Q=2863.2(6)$ eV [1]. The upper limit of the effective electron neutrino mass is improved by almost a factor 2 compared to the lowest current value [2], reaching $m_{ν_\mathrm{e}} < 15 $ eV/c${^2}$ (90\% credible interval). |
| title | Improved limit on the effective electron neutrino mass with the ECHo-1k experiment |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2509.03423 |