Background model for the MAJORANA DEMONSTRATOR
Abstract
The MAJORANA Collaboration is constructing a system containing 44 kg of high-purity Ge (HPGe) detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale to ~15 meV. To realize this, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/(ROI-t-y) in the 4 keV region of interest (ROI) around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials and analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements. Preliminary background results obtained during the engineering runs of the Demonstrator are presented.
Keywords
Cite
@article{arxiv.1610.01146,
title = {Background model for the MAJORANA DEMONSTRATOR},
author = {C. Cuesta and N. Abgrall and I. J. Arnquist and F. T. Avignone and A. S. Barabash and F. E. Bertrand and A. W. Bradley and V. Brudanin and M. Busch and M. Buuck and T. S. Caldwell and Y-D. Chan and C. D. Christofferson and P. -H. Chu and J. A. Detwiler and C. Dunagan and Yu. Efremenko and H. Ejiri and S. R. Elliott and A. Fullmer and A. Galindo-Uribarri and T. Gilliss and G. K. Giovanetti and M. P. Green and J. Gruszko and I. S. Guinn and V. E. Guiseppe and R. Henning and E. W. Hoppe and M. A. Howe and B. R. Jasinski and K. J. Keeter and M. F. Kidd and S. I. Konovalov and R. T. Kouzes and J. Leon and A. M. Lopez and J. MacMullin and R. D. Martin and R. Massarczyk and S. J. Meijer and S. Mertens and J. L. Orrell and C. O'Shaughnessy and A. W. P. Poon and D. C. Radford and J. Rager and K. Rielage and R. G. H. Robertson and E. Romero-Romero and B. Shanks and M. Shirchenko and A. M. Suriano and D. Tedeschi and J. E. Trimble and R. L. Varner and S. Vasilyev and K. Vetter and K. Vorren 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},
journal= {arXiv preprint arXiv:1610.01146},
year = {2017}
}
Comments
3 pages, 3 figures