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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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Positron annihilation study of defect formation and evolution in matrix graphite under He ion irradiation

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Nuclear Science and Techniques 2025年第1期36卷 13-21页

作者： Hong-Xia Xu Jian-Dang Liu Bang-Jiao Ye Zi-Wen Pan Jun Lin Jin-Liang Song Jian-Qing Cao Chao Yan Ying-Ping Hao Jin-Xing Cheng Qing-Bo Wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200025China Beijing Institute of High Technology Beijing 100094China

The stability of matrix graphite under neutron irradiation and in corrosive environments is crucial for the safe operation of molten salt reactors(MSRs).Raman spectroscopy and a slow positron beam were employed to investigate the effects of He ion irradiation fluences and subsequent annealing on the microstructure and defects of the matrix *** ions with 500 keV energy and fluences ranging from 1.1×10^(15)ions∕cm^(2)to 3.5×10^(17)ions∕cm^(2)were used to simulate neutron irradiation at 300 *** samples with an irradiation fluence of 3.5×10^(16)ions∕cm^(2)were subjected to isochronal annealing at different temperatures(573 K,873 K and 1173 K)for 3 *** Raman results revealed that the D peak gradually increased,whereas the intrinsic G peak decreased with increasing irradiation *** the same irradiation fluence,the D peak gradually decreased,whereas the intrinsic G peak increased with increasing annealing *** positron beam analysis demonstrated that the density or size of irradiation defects(vacancy type)increased with higher irradiation fluence,but decreased rapidly with increasing annealing *** Raman spectral analysis of sample cross sections subjected to high irradiation fluences revealed the emergence of amorphization precisely at the depth where ion damage was most pronounced,whereas the surface retained its crystalline *** and positron annihilation analyses indicated that the matrix graphite exhibited good irradiation resistance to He ions at 300 ***,vacancy-type defects induced by He ion irradiation exhibit poor thermal stability and can be easily removed during annealing.

关键词： Graphite Positron annihilation Irradiation Raman spectrum

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Layout optimization and performance analysis of large array of imaging atmospheric Cherenkov telescopes

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Chinese physics C 2025年第3期49卷 161-170页

作者： Zhipeng Zhang Ruizhi Yang Shoushan Zhang Zhen Xie Jiali Liu Liqiao Yin Yudong Wang Lingling Ma Zhen Cao School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China Deep Space Exploration Laboratory/School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsBeijing 100049China Department of Physics University of Chinese Academy of SciencesBeijing 100049China Tianfu Cosmic Ray Research Center Chengdu 610299China

The large array of imaging atmospheric Cherenkov telescopes(LACT)is a planned array of 32 Cherenkov telescopes,each featuring 6-m diameter mirrors,to be constructed at the LHAASO *** study focused on optimizing the array layout and analyzing the performance of *** observation modes were examined:large zenith angle observations for ultra-high energy events and small zenith angle observations for lower energy *** large zenith angles(60°),simulations indicate that an 8-telescope subarray can achieve an effective area of 3km^(2)with excellent angular *** small zenith angles,we optimized the layout of 4-telescope cells and the full 32-telescope *** energy threshold of the full array is approximately 200 GeV,which is particularly crucial for studying transient phenomena such as gamma-ray bursts(GRBs)and active galactic nuclei(AGNs).This study provides essential guidance for finalizing the LACT layout design and estimating performance under various observational *** also highlights the potential of LACT for conducting deep observations of ultra-high energyγ-ray sources,performing morphological studies of PeVatrons,and advancing time-domainγ-ray astronomy.

关键词： IACT γ-ray LHAASO

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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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Status and Prospect of Weak Radiative Hyperon Decays

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Chinese physics Letters 2025年第3期42卷 44-51页

作者： Rui-Xiang Shi Zekun Jia Li-Sheng Geng Haiping Peng Qiang Zhao Xiaorong Zhou Department of Physics Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of Nuclear Physics and Technology Guilin 541004China University of Science and Technology of China Hefei 230026China State Key Laboratory of Particle Detection and Electronics Hefei 230026China School of Physics Beihang UniversityBeijing 102206China Sino-French Carbon Neutrality Research Center ′Ecole Centrale de P′ekin/School of General EngineeringBeihang UniversityBeijing 100191China 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 Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Center for High Energy Physics Henan Academy of SciencesZhengzhou 450046China

Weak radiative hyperon decays represent a rich interplay between weak interactions and the internal structure of baryons,offering profound insights into Quantum Chromodynamics and weak *** experimental observations,particularly from BESIII,have revealed deviations from theoretical *** deviations could signal new physics or the need for refined theoretical models incorporating intermediate resonance *** review discusses recent theoretical advancements and key experimental findings,focusing on recent measurements from BESIII and their implications for strong interactions and baryon structure.

关键词： structure refined decay

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Testing Bell inequalities and probing quantum entanglement at CEPC

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Physical Review D 2025年第3期111卷 036008-036008页

作者： Youpeng Wu Ruobing Jiang Alim Ruzi Yong Ban Xueqing Yan Qiang Li State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China Beijing Laser Acceleration Innovation Center Beijing 101407 China

We study quantum entanglement and test violation of Bell-type inequality at the Circular Electron Positron Collider (CEPC), which is one of the most attractive future collides. It is a promising particle collider designed to search new physics, make Standard Model (SM) precision measurements, and serving as a Higgs factory. Our study is based on a fast simulation of the Z boson pair production from Higgs boson decay at s=250 GeV. The detector effects are also included in the simulation. The spin density matrix of the joint ZZ system is parametrized using irreducible tensor operators and reconstructed from the spherical coordinates of the decay leptons. To test Bell inequalities, we construct observable quantities for the H→ZZ* process in CEPC by using the Collins-Gisin-Linden-Massar-Popescu (CGLMP) inequality, whose value is determined from the density matrix of the Z boson pairs. The sensitivity of the Bell inequality violation is observed with more than 1σ and the presence of the quantum entanglement is probed with more than 2σ confidence level.

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Diagnosis of focal spots at relativistic intensity utilizing coherent radiation from laser-driven flying electron sheets

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Matter and Radiation at Extremes 2025年第2期10卷 16-23页

作者： Shirui Xu Zhuo Pan Ying Gao Jiarui Zhao Shiyou Chen Zhusong Mei Xun Chen Ziyang Peng Xuan Liu Yulan Liang Tianqi Xu Tan Song Qingfan Wu Yujia Zhang Zhipeng Liu Zihao Zhang Haoran Chen Qihang Han Jundong Shen Chenghao Hua Kun Zhu Yanying Zhao Chen Lin Xueqing Yan Wenjun Ma State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Beijing Laser Acceleration Innovation Center HuairouBeijing 101400China Guangdong Institute of Laser Plasma Accelerator Technology Guangzhou 510080China Collaborative Innovation Center of Extreme Optics Shanxi UniversityShanxi 030006China

Experimental validation of laser intensity is particularly important for the study of fundamental physics at extremely high ***,reliable diagnosis of the focal spot and peak intensity faces huge *** this work,we demonstrate for the firs time that the coherent radiation farfiel patterns from laser–foil interactions can serve as an in situ,real-time,and easy-to-implement diagnostic for an ultraintense laser *** laser-driven electron sheets,curved by the spatially varying laser fiel and leaving the targets at nearly the speed of light,produce doughnut-shaped patterns depending on the shapes of the focal spot and the absolute laser *** by particle-in-cell simulations,we can achieve measurements of the intensity and the focal spot,and provide immediate feedback to optimize the focal spots for extremely high intensity.

关键词： diagnosis focal spot peak intensity laser foil interactions laser fi coherent radiation farfiel patterns laser driven electron sheets experimental validation laser intensity focal spot coherent radiation

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Curved capillary discharge for guiding and focusing laser-accelerated proton beams

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Physical Review Accelerators and Beams 2025年第3期28卷 032801-032801页

作者： Yang Yan Mingfeng Huang Yanlv Fang Chentong Li Zimin Chen Tong Yang Qiangyou He Yiting Yan Wei Yan State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of Education CAPT Peking University Beijing 100871 China Beijing Laser Acceleration Innovation Center Huairou Beijing 101407 China

Plasma can support extremely high-gradient strong electromagnetic fields, making it suitable not only for laser acceleration but also for short-distance manipulation of the charged particle beams, thereby enabling the miniaturization of particle accelerators. Straight capillary discharge plasma lenses have previously garnered widespread attention from researchers for their excellent focusing capabilities. We introduced the theory of using a curved capillary discharge plasma channel to deflect charged particle beams [Phys. Rev. Accel. Beams 24, 031301 (2021)] and, in this paper, present the first experimental demonstration of plasma-based deflection and focusing of laser-accelerated proton beams. Combined with a dipole magnet, the emittance after transmission was measured, revealing that magnetic field nonlinearity and multiple Coulomb scattering tend to increase the proton beam’s emittance. This work is of great significance for the development of compact beam transport systems.

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Cavity as radio telescope for galactic dark photon

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Science Bulletin 2025年第5期70卷 661-666页

作者： Yanjie Zeng Yuxin Liu Chunlong Li Yuxiang Liu Bo Wang Zhenxing Tang Yuting Yang Liwen Feng Peng Sha Zhenghui Mi Weimin Pan Tianzong Zhang Zhongqing Ji Yirong Jin Jiankui Hao Lin Lin Fang Wang Huamu Xie Senlin Huang Yifan Chen Jing Shu SHANHE Collaboration CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of Sciences(UCAS)Beijing 100190China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Center for High Energy Physics Peking UniversityBeijing 100871China School of Physics Ningxia UniversityYinchuan 750021China Beijing Laser Acceleration Innovation Center Beijing 101400China Institute of Heavy Ion Physics Peking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing 100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institute of Physics Chinese Academy of SciencesBeijing100190China Beijing Academy of Quantum Information Sciences Beijing 100193China Niels Bohr International Academy Niels Bohr InstituteCopenhagen2100Denmark 不详

Dark photons,as a minimal extension of the Standard Model through an additional Abelian gauge group,may propagate relativistically across the galaxy,originating from dark matter decay or annihilation,thereby contributing to a galactic dark photon *** generation of dark photons typically favors certain polarization modes,which are dependent on the interactions between dark matter and dark *** introduce a framework in which a resonant cavity is utilized to detect and differentiate these polarizations,leveraging the daily variation in expected signals due to the anisotropic distribution of dark photons and the rotation of the *** conduct an experimental search using superconducting radio-frequency cavities,noted for their exceptionally high quality factors,proving them to be effective telescopes for observing galactic dark *** approach establishes the most stringent limits yet on the kinetic mixing coefficient between dark photons and electromagnetic photons,thereby unveiling a novel avenue for the indirect search for dark matter via multi-messenger astronomy.

关键词： Dark photon Resonant cavity Dark matter indirect detection Multi-messenger astronomy

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First results of terrestrial gamma-ray flash observed by Insight-HXMT

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Science China(physics,Mechanics & Astronomy) 2025年第5期68卷 113-124页

作者： Qibin Yi Yi Zhao Shaolin Xiong Xuejuan Yang Ce Cai Shuo Xiao Gang Li Gaopeng Lu Hongbo Zhang Fanchao Lyu Wei Xu Xiaobo Li Chengkui Li Mingyu Ge Haisheng Zhao Wangchen Xue Jiacong Liu Chao Zheng Yanqiu Zhang Chenwei Wang Wenjun Tan Shenglun Xie Yue Huang Zhi Chang Congzhan Liu Fangjun Lu Liming Song Yupeng Xu Zhen Zhang Shuangnan Zhang Tipei Li School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Computer and Information Dezhou UniversityDezhou 253023China College of Physics Hebei Normal UniversityShijiazhuang 050024China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550001China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210000China Electronic Information School Wuhan UniversityWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China Institute of Astrophysics Central China Normal UniversityWuhan 430079China Department of Astronomy Tsinghua UniversityBeijing 100084China

As China's first X-ray astronomy satellite,the hard X-ray modulation telescope(Insight-HXMT)carries three sets of X-ray *** high energy X-ray telescope(Insight-HXMT/HE)could serve as an all-sky gamma-ray monitor with a detection area of up to 5000 cm2and energy range from about 200 ke V to 3 Me *** characteristics,together with the high orbital inclination angle(43°)of the satellite,make the HE very suitable for detecting terrestrial gamma-ray flashes(TGFs).In this work,we implemented a dedicated TGF search algorithm for Insight-HXMT/HE,and identified 282 bright TGFs in its first four years of *** made a systematic study on the properties of these TGFs,including trigger time,duration,intensity,as well as the lightning *** found that TGFs detected in mid-latitude regions(30°to 43°)are rare and they do not exhibit significantly different properties compared with TGFs in low-latitude(within 30°).Interestingly,the hardness ratio of TGF measured by Insight-HXMT/HE seems to be independent of the TGF duration,which differs from previous *** results show that,despite the dedicated design for astronomical observation,Insight-HXMT/HE is a versatile instrument to study energetic radiation phenomena from the Earth.

关键词： gamma-ray sources gamma-ray telescopes terrestrial atmosphere

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