Development of a New Type of Germanium Detector for Dark Matter Searches
American Journal of Modern Physics
Volume 4, Issue 1-1, January 2015, Pages: 23-29
Received: Nov. 10, 2014; Accepted: Nov. 14, 2014; Published: Dec. 26, 2014
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Authors
Wenzhao Wei, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Hao Mei, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Guojian Wang, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Gang Yang, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Chao Zhang, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Yutong Guan, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Jing Liu, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Dongming Mei, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States; School of Physics and Optoelectronic, Yangtze University, Jingzhou 434023, China
Christina Keller, Department of Physics, The University of South Dakota, Vermillion, SD 57069, United States
Yiju Wang, School of Physics and Optoelectronic, Yangtze University, Jingzhou 434023, China
Dahai Xu, School of Physics and Optoelectronic, Yangtze University, Jingzhou 434023, China
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Abstract
A new type of germanium (Ge) detector for dark matter searches is under development utilizing the Ge crystal growth facility recently established at the University of South Dakota. Detector-grade crystals with electric impurity levels within 1010/cm3 and neutral impurity levels within 1014/cm3 have been grown regularly in the laboratory. These crystals can be fabricated into planar detectors with 1cm in thickness and 10cm in diameter. When a high voltage is applied to one of the end planes, a uniform electric field in the volume can be established. Such a design could result in a very fast electric signal. A time resolution of 1ns is expected by combining a short drift length and large drift mobility. This may allow us to resolve the difference on the electric pulse rise-time between low-energy nuclear recoil events and electronic recoil events at liquid nitrogen temperatures. An array of 168 planar detectors of this kind was modeled in a Geant4-based Monte Carlo simulation package. Its background reduction power was investigated and its sensitivity in dark matter search is estimated to be ~10-48cm2.
Keywords
Nuclear Recoil, Rise Time Difference, Crystal Growth, Dark Matter Searches
To cite this article
Wenzhao Wei, Hao Mei, Guojian Wang, Gang Yang, Chao Zhang, Yutong Guan, Jing Liu, Dongming Mei, Christina Keller, Yiju Wang, Dahai Xu, Development of a New Type of Germanium Detector for Dark Matter Searches, American Journal of Modern Physics. Special Issue:New Science Light Path on Cosmological Dark Matters. Vol. 4, No. 1-1, 2015, pp. 23-29. doi: 10.11648/j.ajmp.s.2015040101.15
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