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Improved limit on the effective electron neutrino mass with the ECHo-1k experiment

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arxiv 2509.03423 v1 pith:22Q7MP44 submitted 2025-09-03 hep-ex nucl-ex

Improved limit on the effective electron neutrino mass with the ECHo-1k experiment

Fabienne Adam , Felix Ahrens , Luis E. Ardila Perez , Matthias Balzer , Arnulf Barth , Daniel Behrend-Uriarte , Sebastian Berndt , Klaus Blaum
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Frederic W. H. B\"ohm Martin Bra{\ss} Lorenzo Calza Katerina Chrysalidis Menno Door Holger Dorrer Christoph E. D\"ullmann Klaus Eberhardt Sergey Eliseev Christian Enss Pavel Filianin Andreas Fleischmann Robert Gartmann Loredana Gastaldo Markus Griedel Alexander G\"oggelmann Robert Hammann Raphael Hasse Maurits W. Haverkort Simon Heinze Daniel Hengstler Rasmus Jeske Josef Jochum Karl Johnston Nick Karcher Sebastian Kempf Tom Kieck Ulli K\"oster Neven Kovac Nina Kneip Kathrin Kromer Federica Mantegazzini Bruce A. Marsh Marc Merstof Timo Muscheid Martin Neidig Yuri N. Novikov Raghav Pandey Andreas Reifenberger Daniel Richter Alexander Rischka Sebastian Rothe Oliver Sander Rima X. Sch\"ussler Stephan Scholl Christoph Schweiger Clemens Velte Marc Weber Matthias Wegner Klaus Wendt Tom Wickenh\"auser
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classification hep-ex nucl-ex
keywords electronmasseffectiveendpointneutrinoanalysiscapturedetermined
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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_{\nu_\mathrm{e}} < 15 $ eV/c${^2}$ (90\% credible interval).

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Cited by 2 Pith papers

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  1. A Minimal Dark $SU(2)$ Origin of a Massless Dirac Neutrino

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    A minimal dark SU(2)_D model with anomaly cancellation and Z4 symmetry generates a rank-two Dirac neutrino mass matrix enforcing one exactly massless neutrino.

  2. Precise determination of electron-capture $Q$ value of $^{113}$Sn decay related to electron neutrino mass measurements

    nucl-ex 2026-04 accept novelty 6.0

    The ground-state to ground-state electron-capture Q value of 113Sn is 1039.25(19) keV, with an allowed transition at 9.60(20) keV showing enhanced endpoint sensitivity due to proximity to L-shell binding energies.