期刊
ASTROPARTICLE PHYSICS
卷 96, 期 -, 页码 24-31出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2017.10.007
关键词
Cosmogenic production; Double-beta decay; Dark matter detection; Geant4 simulation
资金
- NSF [PHY-0758120, PHYS-0919278, PHYS-1242640]
- DOE [DEFG02-10ER46709]
- Office of Research at the University of South Dakota
- State of South Dakota
- Office of Integrative Activities
- Office Of The Director [1434142] Funding Source: National Science Foundation
We report a comprehensive study of cosmogenic activation of germanium used for tonne-scale rare event Search experiments. The germanium exposure to cosmic rays on the Earth's surface are simulated with and without a shielding container using Geant4 for a given cosmic muon, neutron, and proton energy spectrum. The production rates of various radioactive isotopes are obtained for different sources separately. We find that fast neutron induced interactions dominate the production rate of cosmogenic activation. Geant4-based simulation results are compared with the calculation of ACTIVIA and the available experimental data. A reasonable agreement between Geant4 simulations and several experimental data sets is presented. We predict that cosmogenic activation of germanium can set limits to the sensitivity of the next generation of tonne-scale experiments. (C) 2017 Elsevier B.V. All rights reserved.
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