Browsing by Author "S. Karmakar"

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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.
Exotic Dark Matter Search with the CDEX-10 Experiment at China's Jinping Underground Laboratory
(American Physical Society, 2022) W.H. Dai; L.P. Jia; H. Ma; Q. Yue; K.J. Kang; Y.J. Li; H.P. An; C. Greeshma; J.P. Chang; Y.H. Chen; J.P. Cheng; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; Q.J. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; S. Karmakar; H.B. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; Z.Z. Liu; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; Z. She; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; L.T. Yang; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; Z.Y. Zhang; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
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 the CDEX-10 experiment at China's Jinping underground laboratory. New low-mass dark matter searching channels, neutral current fermionic DM absorption (?+A+A) and DM-nucleus 3?2 scattering (?+?+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 the sub-GeV DM mass region. A cross section limit for the fermionic DM absorption is set to be 2.5×10-46 cm2 (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 and 14 MeV/c2 for the massless dark photon and bound DM final state, respectively. © 2022 authors. Published by the American Physical Society.
Experimental Limits on Solar Reflected Dark Matter with a New Approach on Accelerated-Dark-Matter-Electron Analysis in Semiconductors
(American Physical Society, 2024) Z.Y. Zhang; L.T. Yang; Q. Yue; K.J. Kang; Y.J. Li; H.P. An; C. Greeshma; J.P. Chang; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; Q.J. Guo; T. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; L. Jiang; S. Karmakar; H.B. Li; H.Y. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; J.X. Liu; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; M.K. Singh; T.X. Sun; C.J. Tang; Y. Tian; G.F. Wang; J.Z. Wang; L. Wang; Q. Wang; Y.F. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; J.Z. Zhao; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
Recently a dark matter-electron (DM-electron) paradigm has drawn much attention. Models beyond the standard halo model describing DM accelerated by high energy celestial bodies are under intense examination as well. In this Letter, a velocity components analysis (VCA) method dedicated to swift analysis of accelerated DM-electron interactions via semiconductor detectors is proposed and the first HPGe detector-based accelerated DM-electron analysis is realized. Utilizing the method, the first germanium based constraint on sub-GeV solar reflected DM-electron interaction is presented with the 205.4 kg·day dataset from the CDEX-10 experiment. In the heavy mediator scenario, our result excels in the mass range of 5-15 keV/c2, achieving a 3 orders of magnitude improvement comparing with previous semiconductor experiments. In the light mediator scenario, the strongest laboratory constraint for DM lighter than 0.1 MeV/c2 is presented. The result proves the feasibility and demonstrates the vast potential of the VCA technique in future accelerated DM-electron analyses with semiconductor detectors. © 2024 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.
Projected WIMP sensitivity of the CDEX-50 dark matter experiment
(Institute of Physics, 2024) X.P. Geng; L.T. Yang; Q. Yue; K.J. Kang; Y.J. Li; H.P. An; C. Greeshma; J.P. Chang; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; H. Gong; Q.J. Guo; T. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; L. Jiang; S. Karmakar; H.B. Li; H.Y. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; J.X. Liu; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; M.K. Singh; T.X. Sun; C.J. Tang; Y. Tian; G.F. Wang; J.Z. Wang; L. Wang; Q. Wang; Y.F. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; Z.Y. Zhang; J.Z. Zhao; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
CDEX-50 is a next-generation project of the China Dark Matter Experiment (CDEX) that aims to search for dark matter using a 50-kg germanium detector array. This paper comprises a thorough summary of the CDEX-50 dark matter experiment, including an investigation of potential background sources and the development of a background model. Based on the baseline model, the projected sensitivity of weakly interacting massive particle (WIMP) is also presented. The expected background level within the energy region of interest, set to 2–2.5 keVee, is ∼0.01 counts keVee−1 kg−1 day−1. At 90% confidence level, the expected sensitivity to spin-independent WIMP-nucleon couplings is estimated to reach a cross-section of 5.1 × 10−45 cm2 for a WIMP mass of 5 GeV/c2 with an exposure objective of 150 kg·year and an analysis threshold of 160 eVee. This science goal will correspond to the most sensitive results for WIMPs with a mass of 2.2–8 GeV/c2,. © 2024 IOP Publishing Ltd and Sissa Medialab.
Search for boosted keV-MeV light dark matter particles from evaporating primordial black holes at the CDEX-10 experiment
(American Physical Society, 2023) Z.H. Zhang; L.T. Yang; Q. Yue; K.J. Kang; Y.J. Li; H.P. An; C. Greeshma; J.P. Chang; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; Q.J. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; S. Karmakar; H.B. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; J.X. Liu; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; Z.Z. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; Z. She; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y.F. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.Y. Zhang; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
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. © 2023 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.
Search for exotic interactions of solar neutrinos in the CDEX-10 experiment
(American Physical Society, 2023) X.P. Geng; L.T. Yang; Q. Yue; K.J. Kang; Y.J. Li; H.P. An; C. Greeshma; J.P. Chang; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; H. Gong; Q.J. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; S. Karmakar; H.B. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; J.X. Liu; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; Z.Z. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; Z. She; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y.F. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; Z.Y. Zhang; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu; Y.C. Wu
We investigate exotic neutrino interactions using the 205.4-kg·day dataset from the CDEX-10 experiment at the China Jinping Underground Laboratory. New constraints on the mass and couplings of new gauge bosons are presented. Two nonstandard neutrino interactions are considered: a U(1)B-L gauge-boson-induced interaction between an active neutrino and electron/nucleus, and a dark-photon-induced interaction between a sterile neutrino and electron/nucleus via kinetic mixing with a photon. This work probes an unexplored parameter space involving sterile neutrino coupling with a dark photon. New laboratory limits are derived on dark photon masses below 1 eV/c2 at some benchmark values of Δm412 and g′2sin22θ14. © 2023 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.
Searching for 76Ge neutrinoless double beta decay with the CDEX-1B experiment
(Institute of Physics, 2024) Bing-Tao Zhang; Jun-Zheng Wang; Li-Tao Yang; Qian Yue; Ke-Jun Kang; Yuan-Jing Li; Hai-Peng An; C. Greeshma; Jian-Ping Chang; Yun-Huan Chen; Jian-Ping Cheng; Wen-Han Dai; Zhi Deng; Chang-Hao Fang; Xin-Ping Geng; Hui Gong; Qiu-Ju Guo; Xu-Yuan Guo; Li He; Sheng-Ming He; Jin-Wei Hu; Han-Xiong Huang; Tu-Chen Huang; Hai-Tao Jia; Xi Jiang; S. Karmakar; Hao-Bin Li; Jian-Min Li; Jin Li; Qian-Yun Li; Ren-Ming-Jie Li; Xue-Qian Li; Yu-Lan Li; Yi-Fan Liang; Bin Liao; Fong-Kay Lin; Shin-Ted Lin; Jia-Xuan Liu; Shu-Kui Liu; Yan-Dong Liu; Yu Liu; Yuan-Yuan Liu; Zhong-Zhi Liu; Hao Ma; Yu-Cai Mao; Qi-Yuan Nie; Jin-Hua Ning; Hui Pan; Ning-Chun Qi; Jie Ren; Xi-Chao Ruan; Ze She; Manoj Kumar Singh; Tian-Xi Sun; Chang-Jian Tang; Wei-You Tang; Yang Tian; Guang-Fu Wang; Li Wang; Qing Wang; Yu-Feng Wang; Yun-Xiang Wang; Henry-Tsz-King Wong; Shi-Yong Wu; Yu-Cheng Wu; Hao-Yang Xing; Rui Xu; Yin Xu; Tao Xue; Yu-Lu Yan; Nan Yi; Chun-Xu Yu; Hai-Jun Yu; Jian-Feng Yue; Ming Zeng; Zhi Zeng; Feng-Shou Zhang; Lei Zhang; Zhen-Hua Zhang; Zhen-Yu Zhang; Kang-Kang Zhao; Ming-Gang Zhao; Ji-Fang Zhou; Zu-Ying Zhou; Jing-Jun Zhou
We operated a p-type point contact high purity germanium (PPCGe) detector (CDEX-1B, 1.008 kg) in the China Jinping Underground Laboratory (CJPL) for 500.3 days to search for neutrinoless double beta ( ) decay of 76Ge. A total of 504.3 kg day effective exposure data was accumulated. The anti-coincidence and the multi/single-site event (MSE/SSE) discrimination methods were used to suppress the background in the energy region of interest (ROI, 1989-2089 keV for this work) with a factor of 23. A background level of 0.33 counts/ (keV kg yr) was realized. The lower limit on the half life of 76Ge decay was constrained as , corresponding to the upper limits on the effective Majorana neutrino mass: 3.2-7.5 . © 2024 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Zinc Sulphate and Vermicompost Mitigate Phytotoxic Effects of Arsenic by Altering Arsenic Uptake, Biochemical and Antioxidant Enzyme Activities in Wheat (Triticum aestivum L.)
(Pleiades journals, 2021) S. Karmakar; P. Prakash; A. Chattopadhyay; D. Dutta
Abstract: Seedlings of wheat genotype HUW-234 (Triticum aestivum L.) were raised in pot soil culture using eight different treatment combinations, enriched with inorganic arsenic (AsV at 0, 30 mg/kg soil), zinc sulphate (Zn at 0, 20 mg/kg soil) and vermicompost (at 0, 15 t/ha). Plants exposed to As toxicity were found significantly (P ≤ 0.05) lower in total chlorophyll, carotenoids and soluble protein content and higher in proline accumulation. A significant (P ≤ 0.05) reduction in nitrate reductase (NR) activity was also noticed under this As stress. As toxicity severely altered the activities of several antioxidant scavenging enzymes in the test seedlings. Superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities were found elevated, whereas, catalase (CAT) showed a decrease in its activity in seedlings exposed to As stress. As a consequence, a significant (P ≤ 0.05) reduction in grain yield (up to 42%) was also recorded. Mitigation of toxic effects of As with significant (P ≤ 0.05) alteration in the biochemical constituents, as well as antioxidant enzymatic activities, was observed when supplemented with zinc sulphate and vermicompost whether alone or in combination. All these examined parameters were correlated either positively or negatively with the concentrations of As in wheat grain, straw and root. The rate of translocation of As in plants was increased when solely treated with As; while a decreasing trend was noticed for those plants which received zinc sulphate and vermicompost as treatment. Hence, this study faithfully establishes the relationship of zinc sulphate and vermicompost application with reduced As content in the plant part, thus resulting in better crop growth and yield. © 2021, Pleiades Publishing, Ltd.