Experimental Study on the CsI(Tl) Crystal Anti-Compton Detector for Dark Matter Search

HE Dao; LI Yu-Lan; YUE Qian; LI Yuan-Jing; LI Jin; CHENG Jian-Ping; KWAK J; KIM S; LI Xin; WANG H

Chinese Physics C> 2006, Vol. 30> Issue(6) : 548-553

Experimental Study on the CsI(Tl) Crystal Anti-Compton Detector for Dark Matter Search

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 School of Physics, Seoul National University, Seoul 151-742, South Korea3 Institute of Physics, AS, Taipei 11529, China

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Abstract：
A dark matter search experiment is being carried out with ultra-low energy HPGe detector at Y2L underground laboratory in Korea. Before the system was set up, the active shielding, CsI(Tl) anti-Compton detector, was studied for its performance. By using some radioactive source and recorded data with an FADC, the pulse shape was studied to get a better energy resolution and further PSD method application. The relative light output of crystal at different particle incident positions were compared for setting the threshold for CsI(Tl) detector. The internal background of the crystal was measured with an HPGe detector and the content of ¹³⁷Cs and ¹³⁴Cs isotopes were obtained. An about 18-day test run has been finished and the veto efficiency of CsI crystal anti-Compton detector is about 31% and the event rate of background spectrum of HPGe detector is about 133cpd. Further methods have to be explored to suppress the background level.

References

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HE Dao, LI Yu-Lan, YUE Qian, LI Yuan-Jing, LI Jin, CHENG Jian-Ping, KWAK J, KIM S, LI Xin and WANG H. Experimental Study on the CsI(Tl) Crystal Anti-Compton Detector for Dark Matter Search[J]. Chinese Physics C, 2006, 30(6): 548-553.

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Received: 2005-09-05
Revised: 2005-12-24

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沈阳化工大学材料科学与工程学院沈阳 110142

Experimental Study on the CsI(Tl) Crystal Anti-Compton Detector for Dark Matter Search

Corresponding author: YUE Qian,

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 School of Physics, Seoul National University, Seoul 151-742, South Korea3 Institute of Physics, AS, Taipei 11529, China

Received Date: 2005-09-05

Accepted Date: 2005-12-24

Available Online: 2006-06-05

Abstract: A dark matter search experiment is being carried out with ultra-low energy HPGe detector at Y2L underground laboratory in Korea. Before the system was set up, the active shielding, CsI(Tl) anti-Compton detector, was studied for its performance. By using some radioactive source and recorded data with an FADC, the pulse shape was studied to get a better energy resolution and further PSD method application. The relative light output of crystal at different particle incident positions were compared for setting the threshold for CsI(Tl) detector. The internal background of the crystal was measured with an HPGe detector and the content of ¹³⁷Cs and ¹³⁴Cs isotopes were obtained. An about 18-day test run has been finished and the veto efficiency of CsI crystal anti-Compton detector is about 31% and the event rate of background spectrum of HPGe detector is about 133cpd. Further methods have to be explored to suppress the background level.

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Experimental Study on the CsI(Tl) Crystal Anti-Compton Detector for Dark Matter Search

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