Browsing by Author "Haubin Li"

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Bulk-surface event discrimination in point contact germanium detectors at near-threshold energies with shape-matching pulse-shape methods
(Springer Nature, 2025) Jiashian Wang; Manoj Kumar Singh; Haubin Li; Henry Tsz King Wong
The p-type point-contact germanium (pPCGe) detectors have been widely adopted in searches for low energy physics events such as neutrinos and dark matter. This is due to their enhanced capabilities of background rejection, sensitivity at energies as low as the sub-keV range and particularly fine energy resolution. Nonetheless, the pPCGe is subject to irregular behaviour caused by surface effects for events near the passivated surface. These surface events can, in general, be distinguished from events that occur in the germanium crystal bulk by its slower pulse rise time. Unfortunately, the rise-time spectra of bulk and surface events starts to convolve with each other at sub-keV energies. In this work, we propose a novel method based on cross-correlation shape-matching combined with a low-pass filter to constrain the initial parameter estimates of the signal pulse. This improvement at the lowest level leads to a 50% reduction in computation time and refinements in the rise-time resolution, which will, in the end, enhance the overall analysis. To evaluate the performance of the method, we simulate artificial pulses that resembles bulk and surface pulses by using a programmable pulse generator module (pulser). The pulser-generated pulses are then used to examine the pulse behaviours at near-threshold energies, suggesting a roughly 70% background-leakage reduction in the bulk spectrum. Finally, the method is tested on data collected from the TEXONO experiment, where the results are consistent with our observations in pulser and demonstrated the possibility of lowering the analysis threshold by at least 10 eVee. © The Author(s) 2025.
Constraining dark matter models with a light mediator from the CDEX-10 experiment at China Jinping Underground Laboratory
(Institute of Physics, 2025) Qiyuan Nie; Wenhan Dai; Hao Ma; Qian Yue; Kejun Kang; Yuanjing Li; Haipeng An; C. Greeshma; Jianping Chang; Yunhua Chen; Jianping Cheng; Zhi Deng; Changhao Fang; Xinping Geng; Hui Gong; Tao Guo; Xuyuan Guo; Li He; Jinrong He; Hanxiong Huang; Tuchen Huang; S. Karmakar; Jianmin Li; Jin Li; Yulan Li; Haubin Li; Mingchuan Li; Hanyu Li; Qianyun Li; Renmingjie Ming Jie Li; Xueqian Li; Yifan Liang; Bin Liao; Fong Kay Lin; Shinted Lin; Jiaxuan Liu; Yandong Liu; Yuanyuan Liu; Shukui Liu; Yu Liu; Hui Pan; Ningchun Qi; Jie Ren; Xichao Ruan; Manbin Shen; Manoj Kumar Singh; Wenliang Sun; Tianxi Sun; Changjian Tang; Yang Tian; Hongfei Wan; Junzheng Wang; Yufeng Wang; Guangfu Wang; Li Wang; Qing Wang; Henry Tsz King Wong; Yucheng Wu; Haoyang Xing; Kaizhi Xiong; Rui Xu; Yin Xu; Tao Xue; Yulu Yan; Litao Yang; Nan Yi; Chunxu Yu; Haijun Yu; Xiao Yu; Ming Zeng; Zhi Zeng; Z. H. Zhang; Zhenyu Zhang; Peng Zhang; Fengshou Zhang; Lei Zhang; Jizhong Zhao; Kangkang Zhao; Minggang Zhao; Jifang Zhou; Zuying Zhou; Jingjun Zhu
We search for nuclear recoil signals of dark matter (DM) models with a light mediator using data taken from a p-type point-contact germanium detector of the CDEX-10 experiment at the China Jinping Underground Laboratory. The 90% confidence level upper limits on the DM-nucleon interaction cross section from 205.4 kg-day exposure data are derived, excluding the new parameter space in 2-3 GeV DM mass when the mediator mass is comparable to or lower than the typical momentum transfer. We further interpret our results to constrain a specific self-interacting DM model with a light mediator coupling to the photon through kinetic mixing and set experimental limits on the model parameter region favored by astrophysical observations. © 2025 Institute of Physics. All rights reserved.
Constraints on dark matter boosted by supernova shock within the effective field theory framework from the CDEX-10 experiment
(American Physical Society, 2025) Junzheng Wang; Litao Yang; Qian Yue; Kejun Kang; Yuanjing Li; Haipeng An; C. Greeshma; Jianping Chang; H. Chen; Yunhua Chen; Jianping Cheng; Wenhan Dai; Zhi Deng; Changhao Fang; Xinping Geng; Hui Gong; Qiuju Guo; Tao Guo; Xuyuan Guo; Li He; Jinrong He; Hanxiong Huang; Tuchen Huang; S. Karmakar; Haubin Li; Hanyu Li; Jianming Li; Jianmin Li; Mingchuan Li; Qianyun Li; Renmingjie Ming Jie Li; Xueqian Li; Yulan Li; Yifan Liang; Bin Liao; Fong Kay Lin; Shinted Lin; Jiaxuan Liu; R. Z. Liu; Shukui Liu; Yandong Liu; Yuanyuan Liu; Y. Y. Liu; Hao Ma; Yucai Mao; A. Mureed; Qiyuan Nie; Hui Pan; Ningchun Qi; Jie Ren; Xichao Ruan; Manbin Shen; H. Y. Shi; Major Kumar Singh; Tianxi Sun; Wenliang Sun; Changjian Tang; Yang Tian; Hongfei Wan; Guangfu Wang; Luohuan Wang; Qin Wang; Qing Wang; Yufeng Wang; Yunxiang Wang; Henry Tsz King Wong; Yucheng Wu; Haoyang Xing; Kaizhi Xiong; Rui Xu; Yin Xu; Tao Xue; Yulu Yan; Nan Yi; Chunxu Yu; Haijun Yu; Xiao Yu; M. Zeng; Zhi Zeng; Fengshou Zhang; Peng Zhang; Z. H. Zhang; Zhenyu Zhang; Minggang Zhao; Jifang Zhou; Zuying Zhou; Jingjun Zhu
Supernova shocks can boost dark matter (DM) particles to high, yet nonrelativistic, velocities, providing a suitable mechanism for analysis within the framework of the nonrelativistic effective field theory (NREFT). These accelerated DM sources extend the experimental ability to scan the parameter space of light DM into the sub-GeV region. In this study, we specifically analyze DM accelerated by the Monogem Ring supernova remnant, whose age (∼68000 yr) and distance to Earth (∼300 parsec) are strategically matched to enable detection with current terrestrial detectors. Utilizing the 205.4 kg · day data obtained from the CDEX-10 experiment at the China Jinping Underground Laboratory, we derive new constraints on boosted DM within the NREFT framework. The NREFT coupling constant exclusion regions now penetrate the sub-GeV mass range, with optimal sensitivity achieved for operators O3, O6, O15 in the 0.4–0.6 GeV mass range. © (2025), (American Physical Society). All rights reserved.
Constraints on new physics with light mediators and generalized neutrino interactions via coherent elastic neutrino nucleus scattering
(American Physical Society, 2025) Sevgi Karadaǧ; Muhammed Deniz; S. Karmakar; Major Kumar Singh; Mehmet Demirci; C. Greeshma; Haubin Li; Shinted Lin; M. F. Mustamin; Vivek Sharma; Lakhwinder Singh; M. K. Singh; Venktesh Singh; Henry Tsz King Wong
Weinvestigate new physics effects on coherent elastic neutrino nucleus scattering within the framework of nonstandard interactions and generalized neutrino interactions. Additionally, we examine the possibility of light mediators from a simplified model that includes all possible Lorentz-invariant interactions of vector, axialvector, scalar, pseudoscalar, and tensor types. Constraints and allowed regions at the 90% CL for masses and couplings in each new physics scenario have been obtained through the analysis of TEXONOdata,whichincludes two datasets from a high-purity n-type point contact germanium detector in 2016 and an advanced p-type point contact Ge detector in 2025. The results are presented in comparison with other reactor and accelerator-based neutrino experiments for complementarity. © (2025), (Web Portal American Physical Society). All Rights Reserved.
Dark matter annual modulation analysis with combined nuclear and electron recoil channels
(American Physical Society, 2025) Haubin Li; Mukesh Kumar Pandey; C. H. Leung; Lakhwinder Singh; Henry Tsz King Wong; Hsinchang Chi; Muhammed Deniz; C. Greeshma; Jiunn Wei Chen; H. C. Hsu; Sevgi Karadaǧ; S. Karmakar; V. Kumar; Jin Li; Fong Kay Lin; Shinted Lin; Chengpang Liu; Shukui Liu; Hao Ma; Devendra Kumar Mishra; Kapil Saraswat; Vivek Sharma; Manoj Kumar Singh; Venktesh Singh; D. Tanabe; Jiashian Wang; Chihpan Wu; Litao Yang; C. H. Yeh; Qian Yue
After decades of experimental efforts, the DAMA/LIBRA(DL) annual modulation (AM) analysis on the χN (WIMP dark matter interactions on nucleus) channel remains the only one which can be interpreted as positive signatures. This has been refuted by numerous time-integrated (TI) and AM analysis. It has been shown that χe (WIMP interactions with electrons) alone is not compatible with the DL AM data. We expand the investigations by performing an AM analysis with the addition of χe long-range and short-range interactions to χN, derived using the frozen core approximation method. Two scenarios are considered, where the χN and χe processes are due to a single χ (Γtot1χ) or two different χ's (Γtot2χ). The combined fits with χN and χe provide stronger significance to the DL AM data which are compatible with the presence of additional physical effects beyond χN alone. This is the first analysis which explores how χe AM can play a role in DL AM. The revised allowed regions as well as the exclusion contours from the other null AM experiments are presented. All DL AM allowed parameter spaces in χN and χe channels under both Γtot1χ and Γtot2χ are excluded at the 90% confidence level by the combined null AM results. It can be projected that DL-allowed parameter spaces from generic models with interactions induced by two-WIMPs are ruled out. © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
New Limits on the Coherent Neutrino-Nucleus Elastic Scattering Cross Section at the Kuo-Sheng Reactor-Neutrino Laboratory
(American Physical Society, 2025) S. Karmakar; Manoj Kumar Singh; Vivek Sharma; Henry Tsz King Wong; C. Greeshma; Haubin Li; Lakhwinder Singh; Mehment Ağartıoğlu; JingHan Chen; C. I. Chiang; Muhammed Deniz; H. C. Hsu; S. KaradaÇ; V. Kumar; C. H. Leung; Jianmin Li; Fong Kay Lin; Shinted Lin; Shukui Liu; Hao Ma; Kapil Saraswat; M. K. Singh; Venktesh Singh; D. Tanabe; Jiashian Wang; Litao Yang; C. H. Yeh; Qian Yue
Neutrino-nucleus elastic scattering (νAel) with partial quantum-mechanical coherency has been observed in several nuclei with neutrinos from decay-At-rest pions. This interaction with reactor neutrinos where coherency is >95% has not yet been experimentally observed. We present new results on the studies of the νAel cross section with an electrocooled p-Type point-contact germanium detector at the Kuo-Sheng Reactor Neutrino Laboratory. A total of 242(357) kg-days of Reactor ON(OFF) data at a detector threshold of 200 eV in ionization energy are analyzed. The Lindhard model parametrized by a single variable k which characterizes the quenching function was used. A limit at 90% confidence level of ρ<4.7 at the predicted value of k=0.162 is derived, where ρ is the ratio of the measured to standard model (SM) cross section. Conversely, k<0.288 at the SM value of ρ=1. © 2025 American Physical Society.
Probing dark matter particles from evaporating primordial black holes via electron scattering in the CDEX-10 experiment
(Science China Press, 2024) Zhenhua Zhang; Litao Yang; Qian Yue; Kejun Kang; Yuanjing Li; Haipeng An; C. Greeshma; Jianping Chang; Yunhua Chen; Jianping Cheng; Wenhan Dai; Zhi Deng; Changhao Fang; Xinping Geng; Hui Gong; Qiuju Guo; Tao Guo; Xuyuan Guo; Li He; Shengming He; Jinwei Hu; Hanxiong Huang; Tuchen Huang; Lin Jiang; S. Karmakar; Haubin Li; Hanyu Li; Jianmin Li; Jin Li; Qianyun Li; Renmingjie Li; Xueqian Li; Yulan Li; Yifan Liang; Bin Liao; FongKay Lin; ShinTed Lin; Jiaxuan Liu; Shukui Liu; Yandong Liu; Yu Liu; Yuanyuan Liu; Hao Ma; Yucai Mao; Qiyuan Nie; Jinhua Ning; Hui Pan; Ningchun Qi; Jie Ren; Xichao Ruan; Monoj Kumar Singh; Tianxi Sun; Changjian Tang; Yang Tian; Guangfu Wang; Junzheng Wang; Li Wang; Qing Wang; Yufeng Wang; Yunxiang Wang; Henry Tsz-King Wong; Shiyong Wu; Yucheng Wu; Haoyang Xing; Rui Xu; Yin Xu; Tao Xue; Yulu Yan; Nan Yi; Chunxu Yu; Haijun Yu; Jianfeng Yue; Ming Zeng; Zhi Zeng; Bingtao Zhang; Fengshou Zhang; Lei Zhang; Zhenyu Zhang; Jizhong Zhao; Kangkang Zhao; Minggang Zhao; Jifang Zhou; Zuying Zhou; Jingjun Zhu
Dark matter (DM) is a major constituent of the Universe. However, no definite evidence of DM particles (denoted as “χ”) has been found in DM direct detection (DD) experiments to date. There is a novel concept of detecting χ from evaporating primordial black holes (PBHs). We search for χ emitted from PBHs by investigating their interaction with target electrons. The examined PBH masses range from 1 × 1015 to 7 × 1016 g under the current limits of PBH abundance fPBH. Using 205.4 kg·day data obtained from the CDEX-10 experiment conducted in the China Jinping Underground Laboratory, we exclude the χ-electron (χ-e) elastic-scattering cross section σχ ∼ 5 × 10−29 cm2 for χ with a mass mχ ≲ 0.1 keV from our results. With the higher radiation background but lower energy threshold (160 eV), CDEX-10 fills a part of the gap in the previous work. If (mχ,σχ) can be determined in the future, DD experiments are expected to impose strong constraints on fPBH for large MPBHs. © Science China Press 2024.