Speaker
Description
The two research communities of Neutrinoless Double Beta Decay ($0\nu2\beta$) and dark matter Weakly Interacting Massive Particle (WIMP) searches have had a large technological overlap in their use of the Liquid Xenon (LXe) Time Projection Chamber (TPC). As detectors get larger and more complex, the possibility of combining their efforts into one mutually beneficial experiment becomes important to explore. We present a detector design for a dual-phase, dual-chamber TPC whereby an inner hermetic sapphire vessel acts as a separate volume containing about 5 tonnes of active LXe enriched in $^{136}$Xe for $0\nu2\beta$ searches, embedded within the larger TPC with a now depleted active LXe volume of about 60 tonnes, optimised for WIMP searches. Our projected sensitivities for the $0\nu2\beta$ half life and the spin-independent WIMP-nucleon cross section at 50 GeV/c$^2$ are $2 \times 10^{28}$ years and $2 \times 10^{-49}$ cm$^2$, respectively. The practical challenges in incorporating such a second volume in a TPC are discussed, together with opportunities for more ambitious scenarios.