Limits on light weakly interacting massive particles from the CDEX-1 experiment with a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-type point-contact germanium detector at the China Jinping Underground Laboratory

Yue, Qian; Zhao, Wei; Kang, K.; Cheng, J.; Li, Y. J.; Lin, Shou-De; Cheng, Jianping; Chen, N.; Chen, Q. H.; Chen, Y. H.; Chuang, Y. C.; Deng, Zhi; Du, Qikui; Gong, H.; Hao, X. Q.; He, H.; He, Qingming; Huang, Hanxiong; Huang, T. R.; Jiang, Hao; Li, H. B.; Li, J. M.; Li, J.; Li, X.; Li, X. Y.; Li, Y. L.; Liao, H.; Lin, F. K.; Liu, S. K.; Lu, L.; Ma, Hui; Mao, S. J.; Qin, J. Q.; Ren, Jing; Ruan, Xichao; Shen, Manbin; Singh, L.; Singh, M. K.; Soma, A. K.; Su, Jian; Tang, C. J.; Tseng, C. H.; Wang, J. M.; Wang, L.; Wang, Q.; Wong, H. T.; Wu, Shiyong; Wu, Yucheng; Xianyu, Zhong-Zhi; Xiao, R.; Xing, Haoyang; Xu, Fangzhou; Xu, Y.; Xu, Xiaofeng; Xue, T.; Yang, L. T.; Yang, S. W.; Nan, Yi; Yu, C. X.; Yu, Hao; Yu, Xunzhen; Zeng, X. H.; Zeng, Zhi; Zhang, L.; Zhang, Y. H.; Zhao, M. G.; Zhou, Z. Y.; Zhu, J. J.; Zhu, Wei; Zhu, Xiaobiao; Zhu, Zhonghua

doi:10.1103/physrevd.90.091701

Cited by 103 publications

(101 citation statements)

References 31 publications

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“…For comparison we also show 90 % C.L. exclusion limits from SuperCDMS [7] ( orange ), CDMSlite [23] ( magenta ), LUX [3] ( red ), and CDEX1 [22] ( purple ) and CRESST-II 2015 [84] ( blue ). The brown shaded region corresponds to the sensitivity limit imposed by the solar neutrino coherent scattering background [85] …”

Section: Background Model Of Trex-dm At Lscmentioning

confidence: 99%

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

et al. 2016

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If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time Projection Chambers (TPCs) can be operated with a variety of target elements, offer good tracking capabilities and, on account of the amplification in gas, very low thresholds are achievable. Recent advances in electronics and in novel radiopure TPC readouts, especially micro-mesh gas structure (Micromegas), are improving the scalability and low-background prospects of gaseous TPCs. Here we present TREX-DM, a prototype to test the concept of a Micromegas-based TPC to search for low-mass WIMPs. The detector is designed to host an active mass of kg of Ar at 10 bar, or alternatively kg of Ne at 10 bar, with an energy threshold below 0.4 keVee, and is fully built with radiopure materials. We will describe the detector in detail, the results from the commissioning phase on surface, as well as a preliminary background model. The anticipated sensitivity of this technique may go beyond current experimental limits for WIMPs of masses of 2–8 GeV.

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Section: Background Model Of Trex-dm At Lscmentioning

confidence: 99%

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

et al. 2016

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“…This annual modulation is consistent with WIMP scattering off nuclei inside NaI(Tl) detectors. If the annual modulation signal observed by DAMA/LIBRA is interpreted in the context of the standard halo model [21][22][23], the favored regions of WIMP-nucleon cross-section and WIMP-mass parameter space have been excluded by other direct search experiments [24][25][26][27][28][29]. This has motivated alternative explanations for the DAMA/LIBRA signal [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Pulse-shape discrimination between electron and nuclear recoils in a NaI(Tl) crystal

Lee

Adhikari

et al. 2015

J. High Energ. Phys.

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We report on the response of a high light-output NaI(Tl) crystal to nuclear recoils induced by neutrons from an Am-Be source and compare the results with the response to electron recoils produced by Compton-scattered 662 keV γ-rays from a 137 Cs source. The JHEP08 (2015)093 measured pulse-shape discrimination (PSD) power of the NaI(Tl) crystal is found to be significantly improved because of the high light output of the NaI(Tl) detector. We quantify the PSD power with a quality factor and estimate the sensitivity to the interaction rate for weakly interacting massive particles (WIMPs) with nucleons, and the result is compared with the annual modulation amplitude observed by the DAMA/LIBRA experiment. The sensitivity to spin-independent WIMP-nucleon interactions based on 100 kg·year of data from NaI detectors is estimated with simulated experiments, using the standard halo model.

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“…At the China Jinping Underground Laboratory, in Sichuan, the China Dark Matter Experiment (CDEX [155]) has undertaken several increasingly large target mass runs. Protected by a rock overburden of 2400m, the germanium detectors of CDEX-1 are enclosed in NaI(Tl) cylinders [107] enabling competitive background suppression to very low energy thresholds (0.32 keV ee ) for the Phase 1 run, the threshold reached was halved in the upgrade to CDEX-10 [109] and will ultimately be 100 eV ee for CDEX-1T [155].…”

Section: Cdexmentioning

confidence: 99%

Annual modulation in direct dark matter searches

Froborg

Duffy

2020

J. Phys. G: Nucl. Part. Phys.

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The measurement of an annual modulation in the event rate of direct dark matter detection experiments is a powerful tool for dark matter discovery. Indeed, several experiments have already claimed such a discovery in the past decade. While most of them have later revoked their conclusions, and others have found potentially contradictory results, one still stands today. This paper explains the potential as well as the challenges of annual modulation measurements, and gives an overview on past, present and future direct detection experiments.

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Limits on light weakly interacting massive particles from the CDEX-1 experiment with ap-type point-contact germanium detector at the China Jinping Underground Laboratory

Cited by 103 publications

References 31 publications

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

Pulse-shape discrimination between electron and nuclear recoils in a NaI(Tl) crystal

Annual modulation in direct dark matter searches

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