Multi-site event discrimination for the MAJORANA DEMONSTRATOR

Understand

The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility.

• Background results in the neutrinoless double-beta decay region of interest from data taken during construction, commissioning, and the start of full operations have been recently published.
• A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper.
• This cut is developed to remove events whose waveforms are typical of multi-site energy deposits while retaining (90 +/- 3.5)% of single-site events.