Poly(ethylene 2,6-naphthalate) as a structural active material for the 0νββ experiment, LEGEND
ORAL
Abstract
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.
*This work is supported by the U.S. DOE, and the NSF, the LANL, ORNL and LBNL LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, and MPG;the Italian INFN;the Polish NCN and MNiSW;the Czech MEYS;the Slovak SRDA; the Swiss SNF;the UK STFC; the Russian RFBR ;the Canadian NSERC and CFI; the LNGS and SURF facilities.
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Presenters
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Brennan T Hackett
- Max Planck Institute for Physics