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Characterization of the $^{163}$Ho Electron Capture Spectrum: A Step Towards the Electron Neutrino Mass Determination

Ranitzsch, P. C.; Hassel, C.; Wegner, M. ORCID iD icon; Hengstler, D.; Kempf, S.; Fleischmann, A.; Enss, C.; Gastaldo, L.; Herlert, A.; Johnston, K.


The isotope $^{163}$Ho is in many ways the best candidate to perform experiments to investigate the value of the electron neutrino mass. It undergoes an electron capture process to $^{163}$Dy with an energy available to the decay, Q$_{EC}$, of about 2.8 keV. According to the present knowledge, this is the lowest Q$_{EC}$ value for such transitions. Here we discuss a newly obtained spectrum of $^{163}$Ho, taken by cryogenic metallic magnetic calorimeters with $^{163}$Ho implanted in the absorbers and operated in anticoincident mode for background reduction. For the first time, the atomic deexcitation of the $^{163}$Dy daughter atom following the capture of electrons from the 5s shell in $^{163}$Ho, the OI line, was observed with a calorimetric measurement. The peak energy is determined to be 48 eV. In addition, a precise determination of the energy available for the decay Q$_{EC}$=(2.858±0.010$_{stat}$±0.05$_{syst}$)  keV was obtained by analyzing the intensities of the lines in the spectrum. This value is in good agreement with the measurement of the mass difference between $^{163}$Ho and $^{163}$Dy obtained by Penning-trap mass spectrometry, demonstrating the reliability of the calorimetric technique.

Verlagsausgabe §
DOI: 10.5445/IR/1000125019
Veröffentlicht am 04.11.2020
DOI: 10.1103/PhysRevLett.119.122501
Zitationen: 23
Zitationen: 25
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikro- und Nanoelektronische Systeme (IMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 22.09.2017
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000125019
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 119
Heft 12
Seiten Art.Nr.: 122501
Vorab online veröffentlicht am 19.09.2017
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