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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 Weinheimer¹ — ¹Institut 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.