Direct Detection Constraints on Dark Photons with the CDEX-10 Experiment at the China Jinping Underground Laboratory

She, Z.; Jia, Liping; Yue, Qian; Ma, Hui; Kang, K.; Li, Y. J.; Ağartıoğlu, M.; An, Haipeng; Cheng, Jianping; Chen, J. H.; Chen, Y. H.; Cheng, J.; Dai, Wenhan; Deng, Zhi; Geng, X. P.; Gong, H.; Gu, Peng; Guo, Q.; Guo, Xuyuan; He, Longzhuang; He, S.; He, H. T.; Hu, Juan; Huang, Tuchen; Huang, Hanxiong; Li, H. B.; Li, H.; Li, J. M.; Li, J.; Li, M. X.; Li, X.; Li, X. Q.; Liao, Bin; Lin, F. K.; Lin, Shou-De; Liu, S. K.; Liu, Y. D.; Liu, Z. Z.; Mao, Y.; Nie, Q. Y.; Ning, Jinhua; Pan, H.; Qi, Ningchun; Qiao, Chen-Kai; Ren, Jie; Ruan, Xichao; Sevda, B.; Shang, Changsong; Sharma, V.; Singh, L.; Singh, M. K.; Sun, Tao; Tang, C. J.; Tang, W. Y.; Tian, Yang; Wang, G. F.; Wang, L.; Wang, Q.; Wang, Y.; Wang, Y. X.; Wang, Z.; Wong, H. T.; Wu, Shiyong; Xing, Haoyang; Yin, Xuefeng; Xue, Tao; Yan, Y. L.; Yang, L. T.; Nan, Yi; Yu, C. X.; Yu, H. J.; Yue, Jianfeng; Zeng, Ming; Zeng, Zhi; Zhang, B. T.; Zhang, L.; Zhang, F. S.; Zhang, Z. Y.; Zhao, M. G.; Zhou, Jifang; Zhou, Z. Y.; Zhu, J. J.

doi:10.1103/physrevlett.124.111301

“…The China dark matter experiment (CDEX), aiming at direct dark matter detection and the study of neutrinoless double beta decay of 76 Ge, operates p-type point-contact germanium detectors (PPCGe) at the China Jinping Underground Laboratory (CJPL) [7,[13][14][15][16]. The copper used in the PPCGe detectors of the CDEX experiment leads to a crucial background contribution, which requires assessment due to cosmogenic activation in copper to establish the background model for the CDEX experiment.…”

Section: Introductionmentioning

confidence: 99%

Study of cosmogenic activation in copper for rare event search experiments

She

¹

,

Zeng

²

,

Ma

³

et al. 2021

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Rare event search experiments using germanium detectors are performed in underground laboratories to minimize the background induced by cosmic rays. However, the cosmogenic activation of cupreous detector components on the ground generates long half-life radioisotopes and contributes to the background level. We measured cosmogenic activation with 142.50 kg of copper bricks after 504 days of exposure at an altitude of 2469.4 m outside the China Jinping Underground Laboratory (CJPL). The specific activities of the cosmogenic nuclides produced in the copper bricks were measured using a low-background germanium gamma-ray spectrometer at CJPL. The production rates at sea level, in units of nuclei/kg/day, were $${18.6 \pm 2.0}$$ 18.6 ± 2.0 for $${^{54}}$$ 54 Mn, $${9.9 \pm 1.3}$$ 9.9 ± 1.3 for $${^{56}}$$ 56 Co, $${48.3 \pm 5.5}$$ 48.3 ± 5.5 for $${^{57}}$$ 57 Co, $${51.8 \pm 2.5}$$ 51.8 ± 2.5 for $${^{58}}$$ 58 Co, and $${39.7 \pm 5.7}$$ 39.7 ± 5.7 for $${^{60}}$$ 60 Co. The measurement will help to constrain cosmogenic background estimation for rare event searches using copper as a detector structure and shielding material. Based on the measured production rates, the impact of the cosmogenic background in cupreous components of germanium detectors on the next generation CDEX-100 experiment was assessed with the expected exposure history above ground.

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“…The signature would be a peak at the mass corresponding to the DM particle. SENSEI [42], DAMIC [192], CDEX [455], SuperCDMS [456], EDELWEISS [194], XENON1T [41], XMASS [457], Majorana [458] and GERDA [459] have published results in the energy range between a few eV and ∼1 MeV. These limits could be improved by roughly one order of magnitude with the next generation DARWIN WIMP search experiment for the mass range above ∼ keV [251].…”

Section: Low-background Experimentsmentioning

confidence: 99%

Direct Detection of Dark Matter -- APPEC Committee Report

Billard,

Boulay,

Cebrián

et al. 2021

Preprint

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This Report provides an extensive review of the experimental programme of direct detection searches of particle dark matter. It focuses mostly on European efforts, both current and planned, but does it within a broader context of a worldwide activity in the field. It aims at identifying the virtues, opportunities and challenges associated with the different experimental approaches and search techniques. It presents scientific and technological synergies, both existing and emerging, with some other areas of particle physics, notably collider and neutrino programmes, and beyond. It addresses the issue of infrastructure in light of the growing needs and challenges of the different experimental searches. Finally, the Report makes a number of recommendations from the perspective of a long-term future of the field. They are introduced, along with some justification, in the opening Overview and Recommendations section and are next summarised at the end of the Report. Overall, we recommend that the direct search for dark matter particle interactions with a detector target should be given top priority in astroparticle physics, and in all particle physics, and beyond, as a positive measurement will provide the most unambiguous confirmation of the particle nature of dark matter in the Universe.

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“…An annual modulation analysis (from 3.2 years of data and an energy threshold of 250 eV ee threshold) was made finding no signal [52] and limits on DM-nucleon SI and SD couplings, and considering the Migdal effect, were derived [117]. An array of 3×3 detectors immersed in liquid N 2 with a total mass of ∼10 kg is used in CDEX-10; results for both SI and SD interactions from 102.8 kg•d data and an analysis threshold of 160 eV ee have been already released [118] as well as constraints on dark photons [128] and on WIMP couplings within the framework of effective field theories [129]. The preparation of larger set-ups (CDEX-100 and CDEX-1T) is underway with home-made germanium detectors to be placed inside a 1700 m 3 liquid N 2 tank.…”

Section: Semiconductor Detectorsmentioning

confidence: 99%

The Role of Small Scale Experiments in the Direct Detection of Dark Matter

Cebrián

¹

2021

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In the direct detection of the galactic dark matter, experiments using cryogenic solid-state detectors or noble liquids play for years a very relevant role, with increasing target mass and more and more complex detection systems. But smaller projects, based on very sensitive, advanced detectors following new technologies, could help in the exploration of the different proposed dark matter scenarios too. There are experiments focused on the observation of distinctive signatures of dark matter, like an annual modulation of the interaction rates or the directionality of the signal; other ones are intended to specifically investigate low mass dark matter candidates or particular interactions. For this kind of dark matter experiments at small scale, the physics case will be discussed and selected projects will be described, summarizing the basics of their detection methods and presenting their present status, recent results and prospects.

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Direct Detection Constraints on Dark Photons with the CDEX-10 Experiment at the China Jinping Underground Laboratory

Cited by 37 publications

References 37 publications

Study of cosmogenic activation in copper for rare event search experiments

Study of cosmogenic activation in copper for rare event search experiments

Direct Detection of Dark Matter -- APPEC Committee Report

The Role of Small Scale Experiments in the Direct Detection of Dark Matter

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