Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment
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摘要
The China Dark Matter Experiment(CDEX) is located at the China Jinping Underground Laboratory(CJPL) and aims to directly detect the weakly interacting massive particles(WIMP) flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest(<10~(-2)events·kg~1·day~(-1)·ke V~(-1)(cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.
The China Dark Matter Experiment(CDEX) is located at the China Jinping Underground Laboratory(CJPL) and aims to directly detect the weakly interacting massive particles(WIMP) flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest(<10~(-2)events·kg~1·day~(-1)·ke V~(-1)(cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.
The China Dark Matter Experiment(CDEX) is located at the China Jinping Underground Laboratory(CJPL) and aims to directly detect the weakly interacting massive particles(WIMP) flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest(<10~(-2)events·kg~1·day~(-1)·ke V~(-1)(cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.
引文
1 KANG Ke-Jun,CHENG Jian-Ping,LI Jin et al.(CDEX collaboration).Front Phys.,2013,8(4):412
2 KANG Ke-Jun,YUE Qian,WU Yu-Cheng et al.(CDEX collaboration).Chinese Physics C,2013,37(12):126002
3 ZHAO Wei,YUE Qian,KANG Ke-Jun et al.(CDEX collaboration).Phys.Rev.D,2013,88(5):052004
4 LI Lei,YUE Qian,TANG Chang-Jian et al.Chinese Physics C,2011,35(3):282
5 WU Yu-Cheng,HAO Xi-Qing,YUE Qian et al.Chinese Physics C,2013,37(8):45
6 Agostinelli S,Allison J,Amako K et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2003,506(3):250
7 ET ENTERPRISES LTD.200 mm(8”)photomultiplier9357KB series data sheet
8 Grosjean D E,Vidal R A,Baragiola R A et al.Physical Review B,1997,56(11):6975
9 Ishida N,CHEN M,Doke T et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,1997,384(2):380
10 Amsler C,Badertscher A,Boccone V et al.(Ar DM collaboration).Journal of Instrumentation,2010,5(11):P11003
11 Lally C H,Davies G J,Jones W G et al.Nuclear Instruments and Methods in Physics Research Section B:Beam Interactionswith Materials and Atoms,1996,117(4):421
12 Antonello M,Arneodo F,Badertscher A et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2004,516(2–3):348
13 Seidel G M,Lanou R E,YAO W.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2002,489(1–3):189
14 Gehman V M,Seibert S R,Rielage K et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2011,654(1):116
15 Boccone V,Lightfoot P K,Mavrokoridis K et al.(Ar DM collaboration).Journal of Instrumentation,2009,4(06):P06001
16 Benetti P,Acciarri R,Adamo F et al.Astroparticle Physics,2008,28(6):495
17 Amerio S,Amoruso S,Antonello M et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2004,527(3):329
18 Archambaultt J P,Gumplinger P,Kitching P et al.GEANT4photon readout simulations of plastic scintillating strips with embedded WLS fibers.Proceedings of the Nuclear Science Symposium Conference Record.IEEE,2003.1549
19 Tavazzi S,Mora S,Alessandrini L et al.The Journal of Chemical Physics,2011,134:034707
2 KANG Ke-Jun,YUE Qian,WU Yu-Cheng et al.(CDEX collaboration).Chinese Physics C,2013,37(12):126002
3 ZHAO Wei,YUE Qian,KANG Ke-Jun et al.(CDEX collaboration).Phys.Rev.D,2013,88(5):052004
4 LI Lei,YUE Qian,TANG Chang-Jian et al.Chinese Physics C,2011,35(3):282
5 WU Yu-Cheng,HAO Xi-Qing,YUE Qian et al.Chinese Physics C,2013,37(8):45
6 Agostinelli S,Allison J,Amako K et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2003,506(3):250
7 ET ENTERPRISES LTD.200 mm(8”)photomultiplier9357KB series data sheet
8 Grosjean D E,Vidal R A,Baragiola R A et al.Physical Review B,1997,56(11):6975
9 Ishida N,CHEN M,Doke T et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,1997,384(2):380
10 Amsler C,Badertscher A,Boccone V et al.(Ar DM collaboration).Journal of Instrumentation,2010,5(11):P11003
11 Lally C H,Davies G J,Jones W G et al.Nuclear Instruments and Methods in Physics Research Section B:Beam Interactionswith Materials and Atoms,1996,117(4):421
12 Antonello M,Arneodo F,Badertscher A et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2004,516(2–3):348
13 Seidel G M,Lanou R E,YAO W.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2002,489(1–3):189
14 Gehman V M,Seibert S R,Rielage K et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2011,654(1):116
15 Boccone V,Lightfoot P K,Mavrokoridis K et al.(Ar DM collaboration).Journal of Instrumentation,2009,4(06):P06001
16 Benetti P,Acciarri R,Adamo F et al.Astroparticle Physics,2008,28(6):495
17 Amerio S,Amoruso S,Antonello M et al.Nuclear Instruments and Methods in Physics Research Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2004,527(3):329
18 Archambaultt J P,Gumplinger P,Kitching P et al.GEANT4photon readout simulations of plastic scintillating strips with embedded WLS fibers.Proceedings of the Nuclear Science Symposium Conference Record.IEEE,2003.1549
19 Tavazzi S,Mora S,Alessandrini L et al.The Journal of Chemical Physics,2011,134:034707