CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches

KANG Ke-Jun; YUE Qian; WU Yu-Cheng et al. (CDEX collaboration) and (TEXONO collaboration)

doi:10.1088/1674-1137/37/12/126002

Chinese Physics C> 2013, Vol. 37> Issue(12) : 126002 DOI: 10.1088/1674-1137/37/12/126002

CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches

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Abstract：
The CDEX collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold point-contact p-type germanium detectors, in China JinPing underground Laboratory (CJPL). The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact P⁺ electrode and the outside N⁺ electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both P⁺ and N⁺ electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments.

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KANG Ke-Jun, YUE Qian and WU Yu-Cheng et al. (CDEX collaboration) and (TEXONO collaboration). CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches[J]. Chinese Physics C, 2013, 37(12): 126002. doi: 10.1088/1674-1137/37/12/126002

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Received: 2013-01-31
Revised: 2013-04-03

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches

Corresponding author: YUE Qian,

Received Date: 2013-01-31

Accepted Date: 2013-04-03

Available Online: 2013-12-05

Abstract: The CDEX collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold point-contact p-type germanium detectors, in China JinPing underground Laboratory (CJPL). The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact P⁺ electrode and the outside N⁺ electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both P⁺ and N⁺ electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments.

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CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches

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