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Observation of two-neutrino double electron capture in Xe-124 with XENON1T
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Nikhef and the University of Amsterdam, The Netherlands.
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Antal upphovsmän: 1302019 (Engelska)Ingår i: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 568, nr 7753, s. 532-535Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Two-neutrino double electron capture (2 nu ECEC) is a second-order weak-interaction process with a predicted half-life that surpasses the age of the Universe by many orders of magnitude(1). Until now, indications of 2 nu ECEC decays have only been seen for two isotopes(2-5), Kr-78 and Ba-130, and instruments with very low background levels are needed to detect them directly with high statistical significance(6,7). The 2 nu ECEC half-life is an important observable for nuclear structure models(8-14) and its measurement represents a meaningful step in the search for neutrinoless double electron capture-the detection of which would establish the Majorana nature of the neutrino and would give access to the absolute neutrino mass(15-17). Here we report the direct observation of 2 nu ECEC in Xe-124 with the XENON1T dark-matter detector. The significance of the signal is 4.4 standard deviations and the corresponding half-life of 1.8 x 10(22) years (statistical uncertainty, 0.5 x 10(22) years; systematic uncertainty, 0.1 x 10(22) years) is the longest measured directly so far. This study demonstrates that the low background and large target mass of xenon-based dark-matter detectors make them well suited for measuring rare processes and highlights the broad physics reach of larger next-generation experiments(18-20).

Ort, förlag, år, upplaga, sidor
2019. Vol. 568, nr 7753, s. 532-535
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Fysik
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URN: urn:nbn:se:su:diva-169103DOI: 10.1038/s41586-019-1124-4ISI: 000465594200047PubMedID: 31019319OAI: oai:DiVA.org:su-169103DiVA, id: diva2:1322051
Tillgänglig från: 2019-06-10 Skapad: 2019-06-10 Senast uppdaterad: 2019-12-04Bibliografiskt granskad

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Aalbers, JelleAntochi, Vasile CristianBauermeister, BorisConrad, JanFerella, Alfredo D.Lindner, M.Mahlstedt, JörnMorå, KnutPelssers, Bart
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