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Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 93: Neutrino physics without accelerators IV

T 93.3: Vortrag

Donnerstag, 18. März 2021, 16:30–16:45, Tr

Detection prospects for the double-beta decays of 124Xe — •Christian Wittweg1, Brian Lenardo2, Alexander Fieguth2, and Christian Weinheimer11Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48151 Münster, Germany — 2Physics Department, Stanford University, Stanford, CA 94305, USA

The isotope 124Xe is exceedingly rare and long-lived. Still, its slow neutrinoless double-beta decays could be a key to understanding the mass and nature of the neutrino as well as the dominance of matter over antimatter in the Universe. Its double-beta decays with neutrinos could provide constraints for nuclear matrix element calculations in the neutron-poor region of the nuclear chart [C. Wittweg et al., EPJ C 80 (2020) 1161]. What makes 124Xe special among double-beta emitters is the theoretical possibility of three different neutrinoless decay modes – either via double-electron capture in a nuclear resonance, or involving the emission of one or two positrons. Together with the observation of neutrinoless double-beta decays in other isotopes, 124Xe could also allow to disentangle the underlying decay mechanism. The talk will introduce the neutrinoless and two-neutrino decays of 124Xe and discuss the detection prospects with upcoming experiments such as XENONnT, nEXO and DARWIN.

The work of the reporting author is supported by DFG through the research training group GRK2149 Strong and weak interactions - from hadrons to dark matter.

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