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Search for boosted keV-MeV light dark matter particles from evaporating primordial black holes at the CDEX-10 experiment

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arXiv 2022年

作者： Zhang, Z.H. Yang, L.T. Yue, Q. Kang, K.J. Li, Y.J. An, H.P. Greeshma, C. Chang, J.P. Chen, Y.H. Cheng, J.P. Dai, W.H. Deng, Z. Fang, C.H. Geng, X.P. Gong, H. Guo, Q.J. Guo, X.Y. He, L. He, S.M. Hu, J.W. Huang, H.X. Huang, T.C. Jia, H.T. Jiang, X. Karmakar, S. Li, H.B. Li, J.M. Li, J. Li, Q.Y. Li, R.M.J. Li, X.Q. Li, Y.L. Liang, Y.F. Liao, B. Lin, F.K. Lin, S.T. Liu, J.X. Liu, S.K. Liu, Y.D. Liu, Y. Liu, Y.Y. Liu, Z.Z. Ma, H. Mao, Y.C. Nie, Q.Y. Ning, J.H. Pan, H. Qi, N.C. Ren, J. Ruan, X.C. She, Z. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, L. Wang, Q. Wang, Y.F. Wang, Y.X. Wong, H.T. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, R. Xu, Y. Xue, T. Yan, Y.L. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, M. Zeng, Z. Zhang, B.T. Zhang, F.S. Zhang, L. Zhang, Z.Y. Zhao, K.K. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Key Laboratory of Particle and Radiation Imaging Ministry of Education Department of Engineering Physics Tsinghua University Beijing100084 China Department of Physics Tsinghua University Beijing100084 China Institute of Physics Academia Sinica Taipei11529 Taiwan NUCTECH Company Beijing100084 China YaLong River Hydropower Development Company Chengdu610051 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China College of Physics Sichuan University Chengdu610065 China School of Physics Peking University Beijing100871 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China Sino-French Institute of Nuclear and Technology Sun Yat-sen University Zhuhai519082 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

We present novel constraints on boosted light dark matter particles (denoted as "χ") from evaporating primordial black holes (PBHs) using 205.4 kg·day data from the China Jinping Underground Laboratory’s CDEX-10 p-type point contact germanium detector with a 160 eVee analysis threshold. χ from PBHs with masses ranging from 1×1015 g to 7×1016 g are searched in this work. In the presence of PBH abundance compatible with present bounds, our result excludes the χ-nucleon elastic-scattering cross section region from 3.4×10−32 cm2 to 2.3×10−29 cm2 for χ of 1 keV to 24 MeV from PBHs with masses of 5×1015 g, as well as from 1.1×10−28 cm2 to 7.6×10−28 cm2 for χ of 1 keV to 0.6 MeV from PBHs with masses of 7×1016 g. If the χ-nucleon elastic-scattering cross section can be determined in the future, the abundance of PBHs may be severely constrained by χ evaporation. With the lower threshold (160 eVee) of the CDEX-10 experiment compared to the previously used experiments, this work allows for a better reach at soft spectra produced by heavier PBHs, which demonstrates the vast potential of such a technical route to pursue χ from larger PBHs with a low threshold. Copyright © 2022, The Authors. All rights reserved.

关键词： Point contacts

Evaluation on least square method applied to gamma spectrum de-noising

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Evaluation on least square method applied to gamma spectrum ...

作者： Fei Li Xinle Lang Yi Chen Liangquan Ge Li Feng Siwei Li Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu Shude foreign language school

Gamma energy spectrum is a way to confirm the type and content of radioactive nuclides in *** order to obtain effective data of gamma spectrum,it is necessary to analyze the data of gamma spectrum obtained by the ***,due to the influence of statistical fluctuation and gamma generated by the environment itself during the measurement of gamma spectrum,the obtained gamma spectrum is not accurate enough as a result of needing spectral analysis of gamma spectrum,and noise reduction can make the spectral data ***,this paper studies the noise reduction algorithm for gamma spectrum analysis,analyzes the design and application of different algorithms in the process of noise reduction,and summarizes the advantages and disadvantages of this algorithm and others.

关键词： Gamma PCC Evaluation on least square method applied to gamma spectrum de-noising

Search for Neutrinoless Double-Beta Decay of 76Ge with a Natural Broad Energy Germanium Detector

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arXiv 2022年

作者： Dai, Wwnhan H. Ma, H. Yue, Q. She, Z. Kang, K.J. Li, Y.J. Agartioglu, M. An, H.P. Chang, J.P. Chen, Y.H. Cheng, J.P. Deng, Z. Fang, C.H. Geng, X.P. Gong, H. Guo, Q.J. Guo, X.Y. He, L. He, S.M. Hu, J.W. Huang, H.X. Huang, T.C. Jia, H.T. Jiang, X. Li, H.B. Li, J.M. Li, J. Li, Q.Y. Li, R.M.J. Li, X.Q. Li, Y.L. Liang, Y.F. Liao, B. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Y.D. Liu, Y. Liu, Y.Y. Liu, Z.Z. Mao, Y.C. Nie, Q.Y. Ning, J.H. Pan, H. Qi, N.C. Ren, J. Ruan, X.C. Saraswat, K. Sharma, V. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, L. Wang, Q. Wang, Y. Wang, Y.X. Wong, H.T. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, R. Xu, Y. Xue, T. Yan, Y.L. Yang, L.T. Yeh, C.H. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, M. Zeng, Z. Zhang, B.T. Zhang, F.S. Zhang, L. Zhang, Z.H. Zhang, Z.Y. Zhao, K.K. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Department of Engineering Physics Tsinghua University Beijing100084 China Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Tsinghua University Beijing100084 China NUCTECH Company Beijing100084 China YaLong River Hydropower Development Company Chengdu610051 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China College of Physics Sichuan University Chengdu610065 China School of Physics Peking University Beijing100871 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China Sino-French Institute of Nuclear and Technology Sun Yat-sen University Zhuhai519082 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

A natural broad energy germanium (BEGe) detector is operated in the China Jinping Underground Laboratory (CJPL) for a feasibility study of building the next generation experiment of the neutrinoless double-beta (0νββ) decay of 76Ge. The setup of the prototype facility, characteristics of the BEGe detector, background reduction methods and data analysis are described in this paper. A background index of 6.4×10−3 counts/(keV·kg·day) is achieved and 1.86 times lower than our previous result of the CDEX-1 detector. No signal is observed with an exposure of 186.4 kg·day, thus a limit on the half life of 76Ge 0νββ decay is set at T01ν/2 > 5.62×1022 yr at 90% C.L.. The limit corresponds to an effective Majorana neutrino mass in the range of 4.6 ∼ 10.3 eV, dependent on the nuclear matrix elements. © 2022, CC BY.

关键词： Germanium

Constraints on Sub-GeV Dark Matter–Electron Scattering from the CDEX-10 Experiment

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arXiv 2022年

作者： Zhang, Z.Y. Yang, Litao T. Yue, Q. Kang, K.J. Li, Y.J. Agartioglu, M. An, H.P. Chang, J.P. Chen, Y.H. Cheng, J.P. Dai, W.H. Deng, Z. Fang, C.H. Geng, X.P. Gong, H. Guo, Q.J. Guo, X.Y. He, L. He, S.M. Hu, J.W. Huang, H.X. Huang, T.C. Jia, H.T. Jiang, X. Li, H.B. Li, J.M. Li, J. Li, Q.Y. Li, R.M.J. Li, X.Q. Li, Y.L. Liang, Y.F. Liao, B. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Y.D. Liu, Y. Liu, Y.Y. Liu, Z.Z. Ma, H. Mao, Y.C. Nie, Q.Y. Ning, J.H. Pan, H. Qi, N.C. Ren, J. Ruan, X.C. Saraswat, K. Sharma, V. She, Z. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, L. Wang, Q. Wang, Y. Wang, Y.X. Wong, H.T. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, R. Xu, Y. Xue, T. Yan, Y.L. Yeh, C.H. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, M. Zeng, Z. Zhang, B.T. Zhang, F.S. Zhang, L. Zhang, Z.H. Zhao, K.K. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Department of Engineering Physics Tsinghua University Beijing100084 China Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Tsinghua University Beijing100084 China NUCTECH Company Beijing100084 China YaLong River Hydropower Development Company Chengdu610051 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China College of Physics Sichuan University Chengdu610065 China School of Physics Peking University Beijing100871 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China Sino-French Institute of Nuclear and Technology Sun Yat-sen University Zhuhai519082 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

We present improved germanium-based constraints on sub-GeV dark matter via dark matter–electron (χ-e) scattering using the 205.4 kg·day dataset from the CDEX-10 experiment. Using a novel calculation technique, we attain predicted χ-e scattering spectra observable in high-purity germanium detectors. In the heavy mediator scenario, our results achieve 3 orders of magnitude of improvement for mχ larger than 80 MeV/c2 compared to previous germanium-based χ-e results. We also present the most stringent χ-e cross-section limit to date among experiments using solid-state detectors for mχ larger than 90 MeV/c2 with heavy mediators and mχ larger than 100 MeV/c2 with electric dipole coupling. The result proves the feasibility and demonstrates the vast potential of a new χ-e detection method with high-purity germanium detectors in ultralow radioactive background. Copyright © 2022, The Authors. All rights reserved.

关键词： Dark Matter

Exotic Dark Matter Search with CDEX-10 Experiment at China's Jinping Underground Laboratory

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arXiv 2022年

作者： Dai, W.H. Jia, L.P. Ma, H. Yue, Q. Kang, K.J. Li, Y.J. An, H.P. Greeshma, C. Chang, J.P. Chen, Y.H. Cheng, J.P. Deng, Z. Fang, C.H. Geng, X.P. Gong, H. Guo, Q.J. Guo, X.Y. He, L. He, S.M. Hu, J.W. Huang, H.X. Huang, T.C. Jia, H.T. Jiang, X. Karmakar, S. Li, H.B. Li, J.M. Li, J. Li, Q.Y. Li, R.M.J. Li, X.Q. Li, Y.L. Liang, Y.F. Liao, B. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Y.D. Liu, Y. Liu, Y.Y. Liu, Z.Z. Mao, Y.C. Nie, Q.Y. Ning, J.H. Pan, H. Qi, N.C. Ren, J. Ruan, X.C. She, Z. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, L. Wang, Q. Wang, Y. Wang, Y.X. Wong, H.T. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, R. Xu, Y. Xue, T. Yan, Y.L. Yang, L.T. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, M. Zeng, Z. Zhang, B.T. Zhang, F.S. Zhang, L. Zhang, Z.H. Zhang, Z.Y. Zhao, K.K. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Department of Engineering Physics Tsinghua University Beijing100084 China Department of Physics Tsinghua University Beijing100084 China Institute of Physics Academia Sinica Taipei11529 Taiwan NUCTECH Company Beijing100084 China YaLong River Hydropower Development Company Chengdu610051 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China College of Physics Sichuan University Chengdu610065 China School of Physics Peking University Beijing100871 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China Sino-French Institute of Nuclear and Technology Sun Yat-sen University Zhuhai519082 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg·day data taken from a p-type point contact germanium detector of CDEX-10 experiment at China Jinping underground laboratory. New low-mass dark matter searching channels, neutral current fermionic DM absorption (χ + A → ν + A) and DM-nucleus 3→2 scattering (χ + χ + A → + A), have been analyzed with an energy threshold of 160 eVee. No significant signal was found, thus new limits on the DM-nucleon interaction cross section are set for both models at sub-GeV DM mass region. A cross section limit for the fermionic DM absorption is set to be 2.5 ×10−46cm2(90% C.L.) at DM mass of 10 MeV/c2. For the DM-nucleus 3→2 scattering scenario, limits are extended to DM mass of 5 MeV/c2 and 14 MeV/c2 for the massless dark photon and bound DM final state, respectively. © 2022, CC BY.

关键词： Galaxies

Constraints on sub-GeV dark matter boosted by cosmic rays from the CDEX-10 experiment at the China Jinping Underground Laboratory

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arXiv 2022年

作者： Xu, R. Yang, Litao T. Yue, Q. Kang, K.J. Li, Y.J. Agartioglu, M. An, H.P. Chang, J.P. Chen, Y.H. Cheng, J.P. Dai, W.H. Deng, Z. Fang, C.H. Geng, X.P. Gong, H. Guo, X.Y. Guo, Q.J. He, L. He, S.M. Hu, J.W. Huang, H.X. Huang, T.C. Jia, H.T. Jiang, X. Li, H.B. Li, J.M. Li, J. Li, Q.Y. Li, R.M.J. Li, X.Q. Li, Y.L. Liang, Y.F. Liao, B. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Y. Liu, Y.D. Liu, Y.Y. Liu, Z.Z. Ma, H. Mao, Y.C. Nie, Q.Y. Ning, J.H. Pan, H. Qi, N.C. Ren, J. Ruan, X.C. Saraswat, K. Sharma, V. She, Z. Singh, M.K. Sun, T.X. Tang, C.J. Tang, W.Y. Tian, Y. Wang, G.F. Wang, L. Wang, Q. Wang, Y. Wang, Y.X. Wong, H.T. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, Y. Xue, T. Yan, Y.L. Yeh, C.H. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, M. Zeng, Z. Zhang, B.T. Zhang, F.S. Zhang, L. Zhang, Z.H. Zhang, Z.Y. Zhao, K.K. Zhao, M.G. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Department of Engineering Physics Tsinghua University Beijing100084 China Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Tsinghua University Beijing100084 China NUCTECH Company Beijing100084 China YaLong River Hydropower Development Company Chengdu610051 China College of Nuclear Science and Technology Beijing Normal University Beijing100875 China College of Physics Sichuan University Chengdu610065 China School of Physics Peking University Beijing100871 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China Sino-French Institute of Nuclear and Technology Sun Yat-Sen University Zhuhai519082 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India Department of Physics Beijing Normal University Beijing100875 China

We present new constraints on light dark matter boosted by cosmic rays (CRDM) using the 205.4 kg day data of the CDEX-10 experiment conducted at the China Jinping Underground Laboratory. The Monte Carlo simulation package CJPL ESS was employed to evaluate the Earth shielding effect. Several key factors have been introduced and discussed in our CRDM analysis, including the contributions from heavier CR nuclei than proton and helium, the inhomogeneity of CR distribution, and the impact of the form factor in the Earth attenuation calculation. Our result excludes the dark matter–nucleon elastic scattering cross section region from 1.7 × 10-30 to 10-26 cm2 for dark matter of 10 keV/c2 to 1 GeV/c2 Copyright © 2022, The Authors. All rights reserved.

关键词： Monte Carlo methods

Research on restoration method of nuclear pulse current signal of semiconductor detector based on artificial neural networks

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Journal of Physics: Conference Series 2021年第1期2132卷

作者： Zhang Qin ZhangJian Qin JingLong Zhang XinTe Qi Mechanical and Electrical Engineering Chengdu University of Technology Chengdu Sichuan Province 610059 China Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu Sichuan Province 610059 China

The charge pulse generated by semiconductor detector caused by nuclear event carries nuclide and nuclear reaction information, but the amplified charge pulse amplitude is obviously weak and the noise is so large. Aiming at the difficulty of obtaining the charge signal pulse generated by the detector, a method for recovering the nuclear pulse current signal of semiconductor detector is proposed. Pulse recovery is divided into two parts: pulse shape recovery and pulse amplitude recovery. Point at the pulse shape, a shape recognition network of nuclear pulse current signal based on deep learning is proposed. For pulse amplitude,it can be obtained by Mexican straw hat wavelet forming algorithm. This algorithm can eliminate the baseline fluctuation caused by pulse stacking. The proposed shape recognition network of nuclear pulse current signal is composed of classifier and regressor. The classifier is used to judge whether the data contains a complete rising edge. The data containing the complete rising edge is sent to the regressor for prediction, so as to obtain the parameters related to the current pulse shape. The precision, recall and F-Measure of the classifier in classifying the test set are 98.88%, 98.05% and 98.33%, respectively. The average absolute error of the regressor in predicting the parameters related to the current pulse shape is about 9 ns. The experimental results show that the proposed method can recover the shape and amplitude of the current signal.

关键词：

Data Mining and Business Intelligence in SME Customer Relationship Value Analysis

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Data Mining and Business Intelligence in SME Customer Relati...

International Conference on Artificial Intelligence and Advanced Manufacturing (AIAM)

作者： Siyuan Jia Minming Pan Wenlong Sun Harubwira Nyampinga Joyce Yan Wang Wenfeng Zheng Shanghai Urban Construction Vocational College Shanghai China The Indiana University Kelley School of Business Bloomington IN USA Accounting School Shanghai University of International Business and Economics Shanghai China School of Automation Engineering University of Electronic Science and Technology Chengdu China

ISBN: (纸本)9781665417334

As a tool and system, business intelligence plays a vital role in the strategic planning process of a business company. Business intelligence provides companies with functions such as collecting, storing, accessing, and analyzing company data. In the traditional business model, most companies use human resources to track these large amounts of data and information. And business intelligence provides an automated data processing method that significantly improves efficiency. During a customer relationship management service system, a large amount of data will be generated and stored. With this natural data advantage, data analysis has more possibilities in customer relationship management service systems. Based on the business intelligence system, this paper analyzes the data of the customer system. It puts forward the K-means clustering method to analyze the customer quality, the fuzzy set clustering algorithm to examine whether the customer is active. The rough set algorithm to judge to improve the user activity decision analysis. The proposed intelligent business system brings new technical solutions to the maintenance of current corporate customer relationships.

关键词： Clustering methods Clustering algorithms Customer relationship management Rough sets Companies Strategic planning Data models

Experimental verification of a dual-Gaussian charge diffusion model for pixel sensors with heavy ions

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nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2025年 1077卷

作者： Ran, Hu Wang, Hongkai Zhang, Honglin Sun, Wenchao Yang, Haibo Zhu, Jueqi Deng, Zhicong Zhang, Chuanyu Zhao, Chengxin College of Physics Chengdu University of Technology Chengdu610059 China State Key Laboratory of Heavy Ion Science and Technology Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing100021 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China Department of Nuclear Safety and Environmental Engineering Technology China Institute of Atomic Energy Beijing102413 China

The Monolithic Active Pixel Sensor (MAPS), known for its excellent position resolution, has been widely applied in fields such as particle physics, nuclear physics, and radiation imaging. In Monte Carlo simulations, the lack of an analytical model for charge collection and diffusion at the pixel sensor level can often lead to significant deviations between simulation and experimental results. This study proposes a dual-Gaussian charge-diffusion model to describe the charge-diffusion process of heavy-ion particles within a specific range in MAPS pixel sensors. Using the Topmetal−M sensor as a prototype, the dual-Gaussian charge diffusion model was used to simulate the charge diffusion and collection processes of particles 1840Ar and 73181Ta on the sensor via Geant4. The simulation results were compared with the experimental data, producing the necessary fixed parameters for the model (σ1 = 0.04, σ2 = 0.143, ω = 0.926), resulting in high consistency between the model and the experimental data in terms of particle cluster size and charge distribution. This set of parameters was further applied to predict the clustering behavior of the particles 612C, with mean deviations from the experimental results of less than 0.23%. This study provides a theoretical model for the charge diffusion behavior of heavy particles in MAPS, laying the foundation for improved efficiency and accuracy in pixel sensor simulations within Monte Carlo frameworks. The findings have significant implications for the application of pixel sensors in nuclear physics, particle physics, and radiological imaging. © 2025

关键词： Heavy ions