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Contribution Poster 0vbb

Poster (not participating in poster prize competition)

Analysis Techniques and Background Model for the MAJORANA DEMONSTRATOR


  • Thomas CALDWELL

Primary authors

Authorship annotation

for the MAJORANA collaboration

Session and Location

Monday Session, Poster Wall #80 (Auditorium Gallery Left)

Abstract content

The MAJORANA DEMONSTRATOR consists of an array of 44 kg of high-purity Ge detectors (30 kg enriched to 88\% $^{76}$Ge) with a p-type point contact geometry. The DEMONSTRATOR's goals are to search for $0\nu\beta\beta$ decay in $^{76}$Ge and to establish the required background and scalability for a next-generation tonne-scale experiment. With commissioning data and initial physics data, the DEMONSTRATOR has achieved an unprecedented energy resolution of 2.5 keV FWHM at the Q-value of 2039 keV and, with 10 kg-yr of enriched exposure, has recently published a limit of $T^{0\nu}{1/2}>1.9\times10^{25}$ yr (90\% CL). The analysis techniques employed to achieve these results (and used for the upcoming unblinded data set yielding up to 30 kg-yr of exposure) will be presented. In its final configuration, the DEMONSTRATOR has estimated a background of $4^{+3.1}{-2.5}$ c/FWHM/t/yr. Pulse shape based background suppression and details of the DEMONSTRATOR's backgrounds will also be discussed.

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