Development of a low-background structural active-veto scintillator for rare event physics

The polyester poly(ethylene 2,6-naphthalate) (PEN) is an attractive candidate as a low-background material for future rare event physics experiments. The polyester exhibits ideal mechanical, electrical, and scintillation properties permitting its use not only as an active shield but also a structural component with a yield strength higher than that of copper at cryogenic temperatures. Recent formulations have been developed which greatly improve optical clarity, reducing radio impurities, and aiding in production of complex geometries. In this presentation, we will provide an update on synthesis, characterization, and potential applications of PEN and PEN derivatives for rare event physics experiments. Examples will be provided on applications for future germanium-based ton-scale 0νββ experiments.