Multi-site event discrimination for the MAJORANA DEMONSTRATOR
Abstract
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. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using 228Th calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and events, established using simulations.
Cite
@article{arxiv.1901.05388,
title = {Multi-site event discrimination for the MAJORANA DEMONSTRATOR},
author = {S. I. Alvis and I. J. Arnquist and F. T. Avignone and A. S. Barabash and C. J. Barton and F. E. Bertrand and B. Bos and M. Buuck and T. S. Caldwell and Y-D. Chan and C. D. Christofferson and P. -H. Chu and C. Cuesta and J. A. Detwiler and H. Ejiri and S. R. Elliott and T. Gilliss and G. K. Giovanetti and M. P. Green and J. Gruszko and I. S. Guinn and V. E. Guiseppe and C. R. Haufe and R. J. Hegedus and L. Hehn and R. Henning and D. Hervas Aguilar and E. W. Hoppe and M. A. Howe and K. J. Keeter and M. F. Kidd and S. I. Konovalov and R. T. Kouzes and A. M. Lopez and R. D. Martin and R. Massarczyk and S. J. Meijer and S. Mertens and J. Myslik and G. Othman and W. Pettus and A. Piliounis and A. W. P. Poon and D. C. Radford and J. Rager and A. L. Reine and K. Rielage and N. W. Ruof and B. Shanks and M. Shirchenko and D. Tedeschi and R. L. Varner and S. Vasilyev and Vasundhara and B. R. White and J. F. Wilkerson and C. Wiseman and W. Xu and E. Yakushev and C. -H. Yu and V. Yumatov and I. Zhitnikov and B. X. Zhu},
journal= {arXiv preprint arXiv:1901.05388},
year = {2019}
}
Comments
8 pages, 8 figures