SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 39: Neutrinos, Dark Matter VI

T 39.4: Vortrag

Dienstag, 21. März 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.