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SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 39: Neutrinos, Dark Matter VI

T 39.4: Talk

Tuesday, March 21, 2023, 17:45–18:00, POT/0006

Double weak decays of 124Xe and 136Xe in XENON1T and XENONnT — •Christian Wittweg for the XENON collaboration — Physik-Institut, Universität Zürich

The current generation of xenon-based dark matter direct detection experiments has reached large enough target masses and low enough background levels to probe rare double weak decays. Among these decays are the two-neutrino double electron capture (2νECEC) of 124Xe as well as the neutrinoless double beta decay (0νββ) of 136Xe. Observation of the hypothetical neutrinoless decay would provide definite proof of the neutrino’s Majorana nature and indicate lepton number violation. The measurement of the Standard Model 2νECEC – first detected by XENON1T in 2018 – provides nuclear structure information that is a crucial input for the nuclear models used to interpret 0νββ experiments. This contribution will present the 124Xe 2νECEC results and search for 0νββ of 136Xe in XENON1T. Moreover, the sensitivity projection for a 136Xe 0νββ search in XENONnT will be outlined.

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