Extended Data Fig. 8: Schematic of the BOLD detector.
From: Fluorescent bicolour sensor for low-background neutrinoless double β decay experiments
An example of a ββ0ν signal event is shown. The two electrons emitted in the decay (purple) propagate in the dense xenon gas ionizing it, and the ionization electrons drift towards the anode, where their energy is measured by the ETD, which also reconstructs the event barycentre. The Ba2+ ion drifts very slowly towards the cathode, where it is eventually captured and identified by the BTD.
