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Characterization of a Gaseous Time Projection Chamber With an Internal 37Ar Source

IEEE Transactions on Nuclear Science 2025年第5期72卷 1800-1809页

作者： Zhang, Wenming Liu, Yuanchun Han, Ke Wang, Shaobo Zhou, Xiaopeng Guo, Xunan Shanghai Key Laboratory for Particle Physics and Cosmology INPAC and School of Physics and Astronomy Shanghai Jiao Tong University MOE Key Lab for Particle Physics Astrophysics and Cosmology Shanghai200240 China Shanghai200240 China Beihang University School of Physics Beijing102206 China

We report on a novel calibration method of gaseous detectors using an internal 37Ar source. The 37Ar is a fast-decaying and low-energy calibration source that provides a mono-energetic peak of 2.82 keV. A gaseous 37Ar source is injected and uniformly distributed in a Micromegas-based gaseous time projection chamber (TPC). key performance parameters of the detector, such as electron transmission, gain, energy resolution, gain uniformity, and drift field evolution, are effectively and quickly calibrated. The gain uniformity, related to the homogeneity of the avalanche gap of Micromegas, is calibrated quickly thanks to the event-by-event position reconstruction and quasi-point energy deposition of 37Ar. The energy resolution is improved with the obtained gain uniformity map. The most noticeable improvement in energy resolution, from 44.9% to 35.4%, is observed at a working pressure of 7 bar. The internal calibration source is also used to characterize the dependence of the detector's electric field distortion on the drift field. © 1963-2012 IEEE.

关键词： Surface discharges

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Angularity in Higgs boson decays via H→gg at NNLL'accuracy

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Chinese physics C 2025年第2期49卷 60-80页

作者： Jiawei Zhu Yujin Song Jun Gao Daekyoung Kang Tanmay Maji Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics Fudan UniversityShanghai 200433China School of Physics and Astronomy Shanghai Key Laboratory for Particle Physics and Cosmologyand Key Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics Korea UniversitySeoul 02841Korea Department of Physics National Institute of TechnologyKurukshetraHaryana 136119India

We present improved predictions of a class of event-shape distributions called angularity for a contribution from an effective operator in Higgs hadronic decay that suffers from large perturbative *** the framework of the soft-collinear effective theory,logarithmic terms of the distribution are resummed at NNLL'accuracy,for which a two-loop constant of gluon-jet function for angularity is independently determined using a fit to the fixed-order distribution at the NLO corresponding to O(a_(s)^(2))relative to the Born *** determination has reasonable agreement with the value in a recently released *** the fit,we use an asymptotic form with a fractional power conjectured from recoil corrections at one-loop order,and it improves the accuracy of determining positive values of the angularity parameter *** resummed distribution is matched to the NLO fixed-order results to make our predictions valid at all angularity *** also discuss the first and subtracted moments of angularity as a function of a that enable the extraction of information on leading and subleading nonperturbative corrections associated with gluons.

关键词： Higgs decay soft-collinear effective theory angularity resummation

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Design of a LYSO crystal electromagnetic calorimeter for dark photon detection in the DarkSHINE experiment

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Nuclear Science and Techniques 2025年第3期36卷 69-84页

作者： Zhi-Yu Zhao Qi-Bin Liu Ji-Yuan Chen Jing Chen Jun-Feng Chen Xiang Chen Chang-Bo Fu Jun Guo Kim Siang Khaw Liang Li Shu Li Dan-Ning Liu Kun Liu Si-Yuan Song Tong Sun Jian-Nan Tang Yu-Feng Wang Zhen Wang Wei-Hao Wu Hai-Jun Yang Yu-Ming Lin Rui Yuan Yu-Lei Zhang Yun-Long Zhang Bai-Hong Zhou Xu-Liang Zhu Yi-Fan Zhu Tsung-Dao Lee Institute Shanghai Jiao Tong University1 Lisuo RoadShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and Astronomy800 Dongchuan RoadShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201899China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern Physics Fudan UniversityShanghai 200443China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

This paper presents the design and optimization of a lutetium yttrium oxyorthosilicate(LYSO)crystal electromagnetic calorimeter(ECAL)for the DarkSHINE experiment,which aims to identify dark photons as potential mediators of dark *** ECAL design was evaluated through comprehensive simulations,focusing on optimizing dimensions,material selection,energy distribution,and energy *** configuration consisted of 21×21×11 LYSO crystals,each measuring 2.5 cm×2.5 cm×4 cm,arranged in a staggered layout to enhance signal detection efficiency.A 4 GeV energy dynamic range was established to ensure accurate energy measurements without saturation,which is essential for background rejection and signal identification.A detailed digitization model was developed to simulate scintillation,silicon photomultiplier,and analog-to-digital converter behaviors,providing a realistic representation of the detector's ***,the study assessed radiation damage in the ECAL region,emphasizing the importance of using radiation-resistant scintillators and silicon sensors.

关键词： Electromagnetic calorimeter LYSO Scintillator detector Light dark matter Dark photon

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Probing neutral triple gauge couplings via Z_(γ)(l+l-y)production at e^(+)e^(-)colliders

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Frontiers of physics 2025年第1期20卷 1-14页

作者： Danning Liu Rui-Qing Xiao Shu Li John Ellis Hong-Jian He Rui Yuan Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and AstronomyKey Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics King’s College LondonStrandLondon WC2R 2LSUK Center for High Energy Physics Peking UniversityBeijing 100871China Theoretical Physics Department CERNCH-1211 Geneva 23Switzerland

Neutral triple gauge couplings(nTGCs)are absent in the Standard Model(SM)and at the dimension-6 level in the Standard Model Effective Field Theory(SMEFT),arising first from dimension-8 *** such,they provide a unique window for probing new physics beyond the *** dimension-8 operators can be mapped to nTGC form factors whose structure is consistent with the spontaneously-broken electroweak gauge symmetry of the *** this work,we study the probes of nTGCs in the reaction e^(+)e^(-)→Z_(γ)with Z→l^(+)l^(-)(l=e,μ)at an e^(+)e^(-)*** perform a detector-level simulation and analysis of this reaction at the Circular Electron Positron Collider(CEPC)with collision energy√s=240 GeV and an integrated luminosity of 20 ab−*** present the sensitivity limits on probing the new physics scales of dimension-8 nTGC operators via measurements of the corresponding nTGC form factors.

关键词： anomalous gauge coupling future colliders Zγ effective field theory neutral triple gauge coupling

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Cosmological distance forecasts for the CSST Galaxy Survey using BAO peaks

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Science China(physics,Mechanics & Astronomy) 2025年第4期68卷 228-243页

作者： Feng Shi Jieyi Tian Zhejie Ding Xiaohu Yang Yizhou Gu Christoph Saulder Xiaoping Li Yanming Liu Zitong Wang Hu Zhan Ming Li Xiaolei Li Hong Guo Yan Gong Yunkun Han Cheng Li Yipeng Jing Jipeng Sui Run Wen Gong-Bo Zhao Hu Zou Pengjie Zhang Xianzhong Zheng Xingchen Zhou School of Aerospace Science and Technology Xidian UniversityXi’an 710126China Shaanxi Key Laboratory of Space Extreme Detection Xidian UniversityXi’an 710126China Department of Astronomy School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Physics Astrophysics and Cosmology(MoE)and Shanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghai 200240China Max Planck Institute for Extraterrestrial Physics Garching 85748Germany Universitats-Sternwarte Munchen Munich 81679Germany National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China The Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China College of Physics Hebei Normal UniversityShijiazhuang 050024China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryShanghai 200030China Yunnan Observatories Chinese Academy of SciencesKunming 650216China Department of Astronomy Tsinghua UniversityBeijing 100084China Purple Mountain Observatory Chinese Academy of SciencesNanjing210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Tsung-Dao Lee Institute and Key Laboratory for Particle Physics Astrophysics and CosmologyMinistry of EducationShanghai Jiao Tong UniversityShanghai 201210China

The measurement of cosmological distances using baryon acoustic oscillations(BAO)is crucial for studying the universe’s *** China Space Station Telescope(CSST)galaxy redshift survey,with its vast volume and sky coverage,provides an opportunity to address key challenges in ***,redshift uncertainties in galaxy surveys can degrade both angular and radial distance *** this study,we forecast the precision of BAO distance measurements using mock CSST galaxy samples,applying a two-point correlation function(2PCF)wedge approach to mitigate redshift *** simulate redshift uncertainties of σ_(0)=0.003 andσ_(0)=0.006,representative of expected CSST errors,and examine their effects on the BAO peak and distance scaling factors,α_(⊥)andα_(||),across redshift bins within 0.0

关键词： large-scale structure distance scale cosmology

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PandaX-xT——A deep underground multi-ten-tonne liquid xenon observatory

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 105-120页

作者： Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Chen Cheng Zhaokan Cheng Xiangyi Cui Yingjie Fan Deqing Fang Lisheng Geng Karl Giboni Linhui Gu Xunan Guo Xuyuan Guo Zhichao Guo Chencheng Han Ke Han Changda He Jinrong He Di Huang Junting Huang Zhou Huang Ruquan Hou Yu Hou Xiangdong Ji Yonglin Ju Chenxiang Li Jiafu Li Mingchuan Li Shuaijie Li Tao Li Qing Lin Jianglai Liu Congcong Lu Xiaoying Lu Lingyin Luo Yunyang Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Binyu Pang Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Xiaofeng Shang Xiyuan Shao Guofang Shen Lin Si Wenliang Sun Yi Tao Anqing Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Xu Wang Zhou Wang Yuehuan Wei Mengmeng Wu Weihao Wu Yuan Wu Mengjiao Xiao Xiang Xiao Binbin Yan Xiyu Yan Yong Yang Chunxu Yu Ying Yuan Zhe Yuan Youhui Yun Xinning Zeng Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang Yingxin Zhang Yuanyuan Zhang Li Zhao Jifang Zhou Ning Zhou Xiaopeng Zhou Yong Zhou Yubo Zhou Zhizhen Zhou New Cornerstone Science Laboratory Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213China School of Physics Sun Yat-sen UniversityGuangzhou 510275China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Department of Physics Yantai UniversityYantai 264005China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Beihang UniversityBeijing 102206China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinesen Academy of SciencesHuizhou 516000China Yalong River Hydropower Development Company Ltd.Chengdu 610051China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics University of MarylandCollege ParkMaryland 20742USA State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China School of Physics Nankai UniversityTianjin 300071China SJTU Paris Elite I

We propose a major upgrade to the existing PandaX-4T experiment at the China Jinping Underground *** new experiment,PandaX-xT,will be a multi-ten-tonne liquid xenon,ultra-low background,and general-purpose *** full-scaled PandaX-xT contains a 43-t liquid xenon active *** an experiment will significantly advance our fundamental understanding of particle physics and *** sensitivity of dark matter direct detection will be improved by nearly two orders of magnitude compared to the current best limits,approaching the so-called“neutrino floor”for a dark matter mass above 10 GeV/c^(2),providing a key test to the Weakly Interacting Massive particle *** searching for the neutrinoless double beta decay of^(136)Xe isotope in the detector,the effective Majorana neutrino mass can be measured to a 10-41 meV/c^(2) sensitivity,providing a key test to the Dirac/Majorana nature of *** neutrinos and other ultra-rare interactions can also be measured and searched for with an unprecedented background level,opening up new windows of *** on the findings,PandaX-xT will seek the next stage upgrade utilizing isotopic separation of natural xenon.

关键词： dark matter neutrino less double beta decay astrophysical neutrinos liquid xenon

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Type-II seesaw effects on neutrino trident scattering 12

Type-II seesaw effects on neutrino trident scattering

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12th Neutrino Oscillation Workshop, NOW 2024

作者： Li, Ming-Wei Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong Uniνersity Shanghai200240 China Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong Uniνersity Shanghai200240 China

In this talk, we have briefly discussed the Type-II seesaw contributions to the W mass, charged lepton flavor violation (CLFV), and neutrino trident scattering. Based on CLFV experimental data, we have derived a lower limit on the triplet vacuum expectation value (vev) νΔ as a function of the triplet scalar mass mΔ: νΔ > 6.3 eV (100 GeV/mΔ). This result indicates that the effect of the triplet vev νΔ on the W mass could be neglected. We also find that the Type-II seesaw reduces the standard model (SM) neutrino trident scattering cross section, but the deviation ratio remains above 0.98 at the 3σ confidence level. © Copyright owned by the author(s)

关键词： Neutrons

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Vector meson’s spin alignments in high energy reactions

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Science China(physics,Mechanics & Astronomy) 2025年第1期68卷 1-16页

作者： Jin-Hui Chen Zuo-Tang Liang Yu-Gang Ma Xin-Li Sheng Qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application(MoE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation(MOE)Shandong UniversityQingdao 266237China INFN-Firenze Sesto Fiorentino FI 50019Italy Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Mechanics and Physics Anhui University of Science and TechnologyHuainan 232001China

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider(RHIC)at Brookhaven National laboratory(BNL).It provides a unique opportunity to probe the correlation between the po-larized quark and antiquark in the strongly coupled quark-gluon plasma(sQGP)produced in relativistic heavy ion collisions,opening a new window to explore the properties of *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e^(+)e^(−)annihilations at high energies where hadron production is dominated by quark fragmentation *** results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we present a brief review of theoretical and experimen-tal advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation

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Inorganic Additives Induce More Small-Sized Microplastics Releasing from Medical Face Masks

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Environmental Science and Technology 2025年第18期59卷 2025 Apr 28页

作者： Wang, Licheng Xie, Lifang Li, Yumo Huang, Tingting You, Wenbo Tahir, Muhammad Ali Wang, Wei Ge, Qiuyue Liu, Yangyang Wang, Tao Wang, Longqian Ruan, Xuejun Ji, Minbiao Zhang, Liwu Department of Environmental Science & Engineering Fudan University Shanghai200433 China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Fudan University Shanghai200433 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China State Key Laboratory of Surface Physics Department of Physics Academy for Engineering and Technology Key Laboratory of Micro and Nano Photonic Structures Ministry of Education Fudan University Shanghai200433 China

Although previous studies have extensively explored the release of microplastics from masks, the specific influence of inorganic additives on microplastic emissions has remained unidentified. Herein, we performed a comparative analysis of medical face masks (MFMs) with calcium carbonate (CaCO3) additives against those devoid of CaCO3 to understand their roles in microplastic release. Briefly, our investigation employed surface-enhanced Raman spectroscopy (SERS) to examine micro- and nanoplastic release, while the stereoscopic characterization of mixing states of additives in microplastic was accomplished through a simulated Raman scattering (SRS). We also pioneered a three-dimensional imaging (3D imaging) method for investigating the internal aging of plastic using SRS, which clearly revealed the link between inorganic additives inside polymers and photoaging. We found that inorganic additives substantially accelerate the photoaging of the plastic materials through multiple pathways and induce more small-sized microplastics. Follow-up radical quenching experiments confirmed carbonate radicals as the main cause of this phenomenon. Our research exposes the hazardous potential of inorganic additives in masks to amplify the emission of microplastics. © 2025 American Chemical Society.

关键词： Stimulated Raman scattering

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Theoretical understanding of defects-driven mechanoluminescence for Pr^(3+)-doped NaNbO_(3)/LiNbO_(3)heterojunctions

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Journal of Rare Earths 2025年第4期43卷 691-700,I0002页

作者： Wenhao Li Minyu Jin Jianhui Li Ci Wang Haizheng Shi Jinlong Nan Qingmiao Hu Baifeng Liu Lu Liu Jing Ren Jianzhong Zhang Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of ChinaCollege of Physics and Optoelectronic EngineeringHarbin Engineering UniversityHarbin150001China Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic EngineeringHarbin Engineering UniversityHarbin150001China Institute of Metal Research Chinese Academy of SciencesShenyang110016China Shanghai APACTRON Particle Equipment Co. LtdShanghai200000China

Mechano luminescence(ML),which involves the emission of light under mechanical stimuli,shows great potential in various applications such as sensing,imaging,and energy *** research suggests that the luminescence mechanism of ML is typically connected to specific defects present within the *** this study,we focus on the investigation of ML defects in Pr^(3+)-doped NaNbO_(3)/LiNbO_(3)heterojunctions,employing a combination of experimental and theoretical *** experimental analysis,we confirmed the presence of the heterojunction and its influence on ML intensity,and the optimal doping ratio for the heterojunction in ML was ***,we examined the influence of varying Pr^(3+)doping concentrations on ML behavior and a proof-of-concept was demonstrated using the X-rays charged heterostructural phosphor as a stress sensor for biological *** position and concentration of internal defects in the ML material were scrutinized through thermo luminescence tests employing the variable heating rate method and positron *** the experimental findings,theoretical simulations were conducted to elucidate the underlying mechanisms responsible for the observed ML *** functional theory calculations were employed to investigate the energy levels,charge transfer processes,and lattice distortions within the heterojunctions under mechanical *** predictions were compared and validated against the experimental *** integration of experimental and theoretical approaches provides a comprehensive understanding of the ML behavior of Pr^(3+)-doped NaNbO_(3)/LiNbO_(3)*** insights gained from this research contribute to the development of novel ML materials and pave the way for their applications in next-generation sensing and energy conversion devices.

关键词： Mechanoluminescence Defects First-principle calculations Positron annihilation lifetime test Heterostructures Rare earths

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