Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 872, Issue -, Pages 16-22Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2017.08.005
Keywords
Neutrinoless double-beta decay; Germanium detector; Majorana; Detector calibration
Categories
Funding
- US Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-05CH11231, DE-AC52-06NA25396, DE-FG02-97ER41041, DE-FG02-97ER41033, DE-FG02-97ER41042, DE-SC0012612, DE-FG02-10ER41715, DE-SC0010254, DE-FG0297ER41020]
- Nuclear Physics Program of the National Science Foundation [PHY- 0919270, PHY-1003940, 0855314, PHY-1202950, MRI 0923142, 1003399]
- Russian Foundation for Basic Research [15-02-02919]
- US Department of Energy through the LANL/LDRD Program
- DOE Office of Science User Facility [DE-AC02-05CH11231, DE-AC05-00OR22725]
- National Energy Research Scientific Computing Center
- Particle Astrophysics Program
- Direct For Mathematical & Physical Scien
- Division Of Physics [0855314] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1003399] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0012612, DE-SC0010254] Funding Source: U.S. Department of Energy (DOE)
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The Majorana Collaboration is searching for the neutrinoless double-beta decay of the nucleus 76Ge. The Majorana Demonstrator is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a 1-ton 76Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioactive line sources can be deployed around the cryostats containing the detectors for regular energy calibrations. When measuring in low-background mode, these line sources have to be stored outside the shielding so they do not contribute to the background. The deployment and the retraction of the source are designed to be controlled by the data acquisition system and do not require any direct human interaction. In this paper, we detail the design requirements and implementation of the calibration apparatus, which provides the event rates needed to define the pulse-shape cuts and energy calibration used in the final analysis as well as data that can be compared to simulations. Published by Elsevier B.V.
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