Search of low-mass WIMPs with a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:math>-type point contact germanium detector in the CDEX-1 experiment

Zhao, Wei; Yue, Qian; Kang, K.; Cheng, J.; Li, Y. J.; Wong, H. T.; Lin, Shou-De; Cheng, Jianping; Chen, J. H.; Chen, Q. H.; Chen, Y. H.; 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.; Li, J. M.; Li, X.; Li, X. Y.; Li, Y. L.; Lin, F. K.; Liu, S. K.; Lu, L.; Ma, Hui; L., J.; Mao, S. J.; Qin, J. Q.; Ren, Jing; Ruan, Xichao; Sharma, V.; Shen, Manbin; Singh, L.; Singh, M. K.; Soma, A. K.; Su, Jian; Tang, C. J.; Wang, J. M.; Wang, L.; Wang, Q.; Wu, Shiyong; Wu, Y. C.; 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, Ming; 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.93.092003

Cited by 62 publications

(91 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For both, the median (90% C.L.) (thick black solid curve) upper limit from CDMSlite Run 2 is compared to other selected direct-detection limits from PANDAX-II (thick-green dotted curve) [61], LUX (thick-green dotdashed curve) [62], XENON100 (thick-green dashed curve) [63], PICO-60 (magenta upward triangles) [64], PICO-2L (magenta downward triangles) [65], PICASSO (purple dot-dashed band) [66], CDEX-0 (thin-red dashed curve) [67,68], and CDEX-1 (thin-red solid curve) [68]. The orange band surrounding the Run 2 result is the 95% uncertainty interval on the upper limit.…”

Section: Fig 32mentioning

confidence: 99%

Low-mass dark matter search with CDMSlite

Agnese¹,

Anderson²,

Aralis³

et al. 2018

Phys. Rev. D

224

265

View full text Add to dashboard Cite

The SuperCDMS experiment is designed to directly detect weakly interacting massive particles (WIMPs) that may constitute the dark matter in our Galaxy. During its operation at the Soudan Underground Laboratory, germanium detectors were run in the CDMSlite mode to gather data sets with sensitivity specifically for WIMPs with masses <10 GeV=c 2 . In this mode, a higher detector-bias voltage is applied to amplify the phonon signals produced by drifting charges. This paper presents studies of the experimental noise and its effect on the achievable energy threshold, which is demonstrated to be as low as 56 eV ee (electron equivalent energy). The detector-biasing configuration is described in detail, with analysis corrections for voltage variations to the level of a few percent. Detailed studies of the electric-field geometry, and the resulting successful development of a fiducial parameter, eliminate poorly measured events, yielding an energy resolution ranging from ∼9 eV ee at 0 keV to 101 eV ee at ∼10 keV ee . New results are derived for astrophysical uncertainties relevant to the WIMP-search limits, specifically examining how they are affected by variations in the most probable WIMP velocity and the Galactic escape velocity. These variations become more important for WIMP masses below 10 GeV=c 2 . Finally, new limits on spin-dependent low-mass WIMP-nucleon interactions are derived, with new parameter space excluded for WIMP masses ≲3 GeV=c 2 .

show abstract

Section: Fig 32mentioning

confidence: 99%

Low-mass dark matter search with CDMSlite

Agnese¹,

Anderson²,

Aralis³

et al. 2018

Phys. Rev. D

224

265

View full text Add to dashboard Cite

show abstract

“…Bulk and surface events are discriminated by the risetime τ , which is measured by fitting the T p pulse to a hyperbolic tangent function [10][11][12]18]. Figure 8 plots the log 10 (τ ) distribution vs. the measured energy of in situ events.…”

Section: Bulk/surface Event Discrimination and Extremely-fast Eventsmentioning

confidence: 99%

“…The CJPL is the worlds deepest underground laboratory, with a cosmic ray muon flux of 61.7 yr −1 m −2 [8]. Owing to the low physics analysis threshold (160 eVee, where"eVee" represents electron equivalent energy), the excellent energy resolution and low background characteristics of the pPCGe detectors, the CDEX collaboration has achieved a series of competitive results on light WIMP searches [9][10][11][12]. The CDEX-1 experiment, which uses 1 kg-scale single-element pPCGe detectors, has proceeded in two stages: CDEX-1A and CDEX-1B.In CDEX-1A and CDEX-1B, the germanium detector was cooled by a cold finger connected to a 30-L dewar filled with liquid nitrogen (LN 2 ).…”

mentioning

confidence: 99%

Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

Jiang¹,

Yang²,

Yue³

et al. 2018

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

The CDEX-10 experiment searches for light weakly-interacting massive particles, a form of dark matter, at the China JinPing underground laboratory, where approximately 10 kg of germanium detectors are arranged in an array and immersed in liquid nitrogen. Herein, we report on the experimental apparatus, detector characterization, and spectrum analysis of one prototype detector. Owing to the higher rise-time resolution of the CDEX-10 prototype detector as compared with CDEX-1B, we identified the origin of an observed category of extremely fast events. For data analysis of the CDEX-10 prototype, we introduced and applied an improved bulk/surface event discrimination method. The results of the new method were compared to those of the CDEX-1B spectrum. Both sets of results showed good consistency in the 0-12 keVee energy range, except for the 8.0 keV K-shell X-ray peak from the external copper.Established in 2009, the China Dark Matter Experiment (CDEX) Collaboration [6] searched for light WIMPS using p-type point-contact germanium (pPCGe) detectors at the China JinPing underground laboratory (CJPL) [7]. The CJPL is the worlds deepest underground laboratory, with a cosmic ray muon flux of 61.7 yr −1 m −2 [8]. Owing to the low physics analysis threshold (160 eVee, where"eVee" represents electron equivalent energy), the excellent energy resolution and low background characteristics of the pPCGe detectors, the CDEX collaboration has achieved a series of competitive results on light WIMP searches [9][10][11][12]. The CDEX-1 experiment, which uses 1 kg-scale single-element pPCGe detectors, has proceeded in two stages: CDEX-1A and CDEX-1B.In CDEX-1A and CDEX-1B, the germanium detector was cooled by a cold finger connected to a 30-L dewar filled with liquid nitrogen (LN 2 ). However, upscaling the mass of the germanium detector system, to further im-arXiv:1810.08808v1 [physics.ins-det]

show abstract

“…Besides the WIMPs constraints [32,33], the axion searches results from the CDEX-1 experiment based on the 335.6 kg-days of data has been reported before [18]. Using a PPCGe with fiducial mass of 915 g, a physics threshold of 475 eV [33] was achieved for CDEX-1. Focused on the lower energy threshold, a new 1 kg-scale PPCGe detector has been designed and used.…”

Section: Introductionmentioning

confidence: 98%

“…With a vertical rock arXiv:1911.03085v1 [hep-ex] 8 Nov 2019 overburden of 2.4 km, CJPL provides a measured muon flux of 61.7±11.7 y −1 m −2 [31]. Besides the WIMPs constraints [32,33], the axion searches results from the CDEX-1 experiment based on the 335.6 kg-days of data has been reported before [18]. Using a PPCGe with fiducial mass of 915 g, a physics threshold of 475 eV [33] was achieved for CDEX-1.…”

Section: Introductionmentioning

confidence: 99%

Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using the profile likelihood ratio method

Wang¹,

Yue²,

Liu³

et al. 2020

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

We present improved constraints on couplings of solar axions and more generic bosonic dark matter particles using 737.1 kg-days of data from the CDEX-1B experiment. The CDEX-1B experiment, located at the China Jinping Underground Laboratory, primarily aims at the direct detection of WIMPs using a p-type point-contact germanium detector. We develop the profile likelihood ratio method for analysis of data in the presence of backgrounds. The background modeling is compatible with the data and no excess signals are observed. An energy threshold of 160 eV was achieved. This significantly improve the sensitivity for the bosonic dark matter below 0.8 keV. Limits are also placed on the coupling gAe < 2.26 × 10 −11 from Compton, bremsstrahlung, atomic-recombination and deexcitation channels and g ef f AN × gAe < 4.14 × 10 −17 from a 57 Fe M1 transition at 90% confidence level. All the constrains improve over our previous results.

show abstract

Search of low-mass WIMPs with ap-type point contact germanium detector in the CDEX-1 experiment

Cited by 62 publications

References 50 publications

Low-mass dark matter search with CDMSlite

Low-mass dark matter search with CDMSlite

Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using the profile likelihood ratio method

Contact Info

Product

Resources

About