Poly(ethylene 2,6-naphthalate) as a structural active material for the 0νββ experiment, LEGEND*

0νββ is the most sensitive experimental test to determine the Majorana nature of the neutrino. The LEGEND experiment is an international effort to measure 0νββ decay using ⁷⁶Ge as both the target isotope and the detecting material. LEGEND is currently constructing its 200-kg phase and preparing a 1000-kg phase, which have background goals of 0.6 and 0.025 counts/ton/year/FWHM, respectively.  One method to improve the background identification in LEGEND is to use active structural materials like Poly(ethylene-2,6-naphthalate)-PEN. PEN is of interest because of its robust structural characteristics, scintillation properties in the blue regime and its wavelength shifting abilities for VUV light. ⁷⁶Ge detectors, installed with PEN holders, were tested in the LEGEND R&D effort, the post GERDA test (PGT). The PGT included approximately 18 kg of ⁷⁶Ge crystals, with 40% of the detectors being mounted with PEN holders. Limits on the background contribution from ²³²Th contamination in the PEN holders as well as predict the improved veto efficiency with the active PEN material versus the passive silicon material was measured. The results of this study will be presented.