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Proton reconstruction with the TOTEM Roman pot detectors for high-β∗ LHC data

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Journal of Instrumentation 2025年第4期20卷 P04012-P04012页

作者： Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J.W. Benato, L. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Hussain, P.S. Jeitler, M. Krammer, N. Li, A. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Waltenberger, W. Wulz, C.-E. Janssen, T. Van Laer, T. Van Mechelen, P. Breugelmans, N. D'Hondt, J. Dansana, S. De Moor, A. Delcourt, M. Heyen, F. Lowette, S. Makarenko, I. Müller, D. Tavernier, S. Tytgat, M. Van Onsem, G.P. Van Putte, S. Vannerom, D. Bilin, B. Clerbaux, B. Das, A.K. De Bruyn, I. De Lentdecker, G. Evard, H. Favart, L. Gianneios, P. Jaramillo, J. Khalilzadeh, A. Khan, F.A. Lee, K. Malara, A. Paredes, S. Shahzad, M.A. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. De Coen, M. Dobur, D. Gokbulut, G. Hong, Y. Knolle, J. Lambrecht, L. Marckx, D. Mota Amarilo, K. Skovpen, K. Van Den Bossche, N. van der Linden, J. Wezenbeek, L. Benecke, A. Bethani, A. Bruno, G. Caputo, C. De Favereau De Jeneret, J. Delaere, C. Donertas, I.S. Giammanco, A. Guzel, A.O. Jain, Sa Lemaitre, V. Lidrych, J. Mastrapasqua, P. Tran, T.T. Alves, G.A. Coelho, E. Correia Silva, G. Hensel, C. Menezes De Oliveira, T. Mora Herrera, C. Rebello Teles, P. Soeiro, M. Vilela Pereira, A. Aldá, W.L. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Fonseca De Souza, S. Gomes De Souza, R. Laux Kuhn, T. Macedo, M. Martins, J. Mundim, L. Nogima, H. Pinheiro, J.P. Santoro, A. Sznajder, A. Yerevan State University Yerevan Armenia TU Wien Vienna Austria Ghent University Ghent Belgium Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual de Campinas Campinas Brazil Federal University of Rio Grande do Sul Porto Alegre Brazil University of Chinese Academy of Sciences Beijing China China Center of Advanced Science and Technology Beijing China Texas A & M University at Qatar Doha Qatar China Spallation Neutron Source Guangdong China Imperial College London United Kingdom University of Shanghai for Science and Technology Shanghai China Northeastern University BostonMA United States CERN Switzerland Zewail City of Science and Technology Zewail Egypt British University in Egypt Cairo Egypt Institute of Nuclear Physics The Uzbekistan Academy of Sciences Tashkent Uzbekistan Purdue University West LafayetteIN United States Université de Haute Alsace Mulhouse France Istinye University Istanbul Turkey Tbilisi State University Tbilisi Georgia The University of the State of Amazonas Manaus Brazil University of Hamburg Hamburg Germany RWTH Aachen University III. Physikalisches Institut A Aachen Germany Wuppertal Germany Brandenburg University of Technology Cottbus Germany Forschungszentrum Jülich Juelich Germany CERN European Organization for Nuclear Research Geneva Switzerland HUN-REN ATOMKI - Institute of Nuclear Research Debrecen Hungary Bucharest Romania MTA-ELTE Lendület CMS Particle and Nuclear Physics Group Eötvös Loránd University Budapest Hungary HUN-REN Wigner Research Centre for Physics Budapest Hungary Physics Department Faculty of Science Assiut University Assiut Egypt Punjab Agricultural University Ludhiana India University of Visva-Bharati Santiniketan India Bangalore India Amity University Uttar Pradesh Noida India IIT Bhubaneswar Bhubaneswar India Institute of Physics Bhubaneswar India University of Hyderabad Hyderabad India Deutsches Elektronen-Synchrotron Hamburg Germany Isfa

The TOTEM Roman pot detectors are used to reconstruct the transverse momentum of scattered protons and to estimate the transverse location of the primary interaction. This paper presents new methods of track reconstruction, measurements of strip-level detection efficiencies, cross-checks of the LHC beam optics, and detector alignment techniques, along with their application in the selection of signal collision events. The track reconstruction is performed by exploiting hit cluster information through a novel method using a common polygonal area in the intercept-slope plane. The technique is applied in the relative alignment of detector layers with μm precision. A tag-and-probe method is used to extract strip-level detection efficiencies. The alignment of the Roman pot system is performed through time-dependent adjustments, resulting in a position accuracy of 3 μm in the horizontal and 60 μm in the vertical directions. The goal is to provide an optimal reconstruction tool for central exclusive physics analyses based on the high-β∗ data-taking period at √s = 13 TeV in 2018. © 2025 CERN. Published by IOP Publishing Ltd on behalf of Sissa Medialab.

关键词： calibration and fitting methods cluster finding Pattern recognition Performance of High Energy Physics Detectors

Topology and Kinetic Pathways of Colloidosome Assembly and Disassembly

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arXiv 2025年

作者： Adkins, Raymond Robaszewski, Joanna Shin, Seungwoo Brauns, Fridtjof Jia, Leroy Khanra, Ayantika Sharma, Prerna Pelcovits, Robert Powers, Thomas R. Dogic, Zvonimir Department of Physics University of California Santa Barbara Santa BarbaraCA93106 United States Molecular Biophysics and Biochemistry Yale University New HavenCT06510 United States Environmental Laboratory US Army Engineer Research and Development Center ConcordMA01742 United States Kavli Institute for Theoretical Physics University of California Santa Barbara Santa BarbaraCA93106 United States Applied and Computational Mathematics Division National Institute of Standards and Technology GaithersburgMD20899 United States Department of Physics Indian Institute of Science Bangalore560012 India Department of Bioengineering Indian Institute of Science Bangalore560012 India Department of Physics Brown University ProvidenceRI02906 United States School of Engineering Brown University ProvidenceRI02906 United States

Liquid shells, such as lipid vesicles and soap bubbles, are ubiquitous throughout biology, engineered matter, and everyday life. Their creation and disintegration are defined by a singularity that separates a topologically distinct extended liquid film from a boundary-free closed shell. Such topology-changing processes are essential for cellular transport and drug delivery. However, their studies are challenging because of the rapid dynamics and small length scale of conventional lipid vesicles. We develop fluid colloidosomes, micron-sized analogs of lipid vesicles. We study their stability close to their disk-to-sphere topological transition. Intrinsic colloidal length and time scales slow down the dynamics to reveal vesicle conformations in real time during their assembly and disassembly. Remarkably, the lowest-energy pathway by which a closed vesicle transforms into a disk involves a topologically distinct cylinder-like intermediate. These results reveal universal aspects of topological changes in all liquid shells and a robust platform for the encapsulation, transport, and delivery of nanosized cargoes. © 2025, CC BY.

关键词： Controlled drug delivery

Possible Dirac quantum spin liquid in the kagome quantum antiferromagnet YCu3(OH)6Br2[Brx(OH)1-x]

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arXiv 2021年

作者： Zeng, Zhenyuan Ma, Xiaoyan Wu, Si Li, Hai-Feng Tao, Zhen Lu, Xingye Chen, Xiao-Hui Mi, Jin-Xiao Song, Shi-Jie Cao, Guang-Han Che, Guangwei Li, Kuo Li, Gang Luo, Huiqian Meng, Zi Yang Li, Shiliang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Macao SAR Taipa999078 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing100875 China Department of Materials Science and Engineering College of Materials Xiamen University Xiamen361005 China Department of Physics Zhejiang University Hangzhou310027 China Zhejiang Province Key Laboratory of Quantum Technology and Devices Interdisciplinary Center for Quantum Information State Key Lab of Silicon Materials Zhejiang University Hangzhou310027 China Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing210093 China Center for High Pressure Science and Technology Advanced Research 10 Xibeiwang East Road Haidian Beijing 100094 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Department of Physics HKU-UCAS Joint Institute of Theoretical and Computational Physics The University of Hong Kong Pokfulam Road Hong Kong

We studied the magnetic properties of YCu3(OH)6Br2[Br1-x(OH)x] (x = 0.33), where Cu2+ions form two-dimensional kagome layers. There is no magnetic order down to 50 mK while the CurieWeiss temperature is on the order of -100 K. At zero magnetic field, the low-temperature specific heat shows a T2dependence. Above 2 T, a linear temperature dependence term in specific heat emerges, and the value of γ = C/T increases linearly with the field. Furthermore, the magnetic susceptibility tends to a constant value at T = 0. Our results suggest that the magnetic ground state of YCu3(OH)6Br2[Br1-x(OH)x] is consistent with a Dirac quantum-spin-liquid state with a linearly dispersing spinon strongly coupled to an emergent gauge field, which has long been theoretically proposed as a candidate ground state in the two-dimensional kagome Heisenberg antiferromagnetic system. Copyright © 2021, The Authors. All rights reserved.

关键词： Temperature distribution

Effect of Feature Shape and Dimension of a Confinement Geometry on Selectivity of Electrocatalytic CO2Reduction

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Angewandte Chemie 2023年第1期136卷

作者： Yesol Kim Dr. Geun-Tae Yun Minki Kim Aqil Jamal Dr. Issam Gereige Prof. Dr. Joel W. Ager Dr. Woo-Bin Jung Prof. Hee-Tae Jung KAIST-UCB-VNU Global Climate Change Research Center Department of Chemical & Biomolecular Engineering (BK-21 plus) Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea Materials and Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Research and Development Center Saudi Aramco Dhahran 31311 Saudi Arabia Department of Materials Science and Engineering University of California Berkeley CA 94720 USA John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA KAIST Institute for Nanocentury 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea

The local confinement effect, which can generate a high concentration of hydroxide ions and reaction intermediates near the catalyst surface, is an important strategy for converting CO 2 into multi-carbon products in electrocatalytic CO 2 reduction. Therefore, understanding how the shape and dimension of the confinement geometry affect the product selectivity is crucial. In this study, we report for the first time the effect of the shape (degree of confinement) and dimension of the confined space on the product selectivity without changing the intrinsic property of Cu. We demonstrate that geometry influences the outcomes of products, such as CH 4 , C 2 H 4 , and EtOH, in different ways: the selectivity of CH 4 and EtOH is affected by shape, while the selectivity of C 2 H 4 is influenced by dimension of geometry predominantly. These phenomena are demonstrated, both experimentally and through simulation, to be induced by the local confinement effect within the confined structure. Our geometry model could serve as basis for designing the confined structures tailored for the production of specific products.

关键词： CO2 Reduction Cu Catalyst Electrocatalysis Local Confinement Selectivity

Low-energy interference structure with attosecond temporal resolution

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arXiv 2020年

作者： Song, Xiaohong Jia, Wenbin Liu, Xiwang Zhang, Hongdan Xue, Qibing Lin, Cheng Quan, Wei Chen, Jing Liu, XiaoJun Yang, Weifeng Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science Shantou University Guangdong Shantou515063 China Department of Mathematics College of Science Shantou University Guangdong Shantou515063 China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou University Guangdong Shantou515063 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan430071 China HEDPS Center for Applied Physics and Technology Collaborative Innovation Center of IFSA Peking University Beijing100084 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing100088 China

Accessing precisely to the phase variation of electronic wave-packet (EWP) provides unprecedented spatiotemporal information of microworld. A radial interference pattern at near-zero energy has been widely observed in experiments of strong-field photoionization. However, the underlying physical picture of this interference pattern is still under debate. Here we report an experimental and theoretical investigation of this low-energy interference structure (LEIS) in mid-infrared laser fields. We clarify that the LEIS arises due to the soft-recollision mechanism, which was previously found to play a pivotal role in producing the pronounced low-energy structure. Specifically, the LEIS is induced by the interference between direct and soft-recollision EWPs launched within a 1/18 laser-cycle time scale in our experiments. Moreover, the observation of LEIS is independent of laser wavelength and specific atomic targets. Our result opens a promising new avenue for retrieving the structure and dynamics of EWPs in atoms and molecules with attosecond time resolution. Copyright © 2020, The Authors. All rights reserved.

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Radial Spin Texture in Elemental Tellurium with Chiral Crystal Structure

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Physical Review Letters 2020年第13期124卷 136404-136404页

作者： M. Sakano M. Hirayama T. Takahashi S. Akebi M. Nakayama K. Kuroda K. Taguchi T. Yoshikawa K. Miyamoto T. Okuda K. Ono H. Kumigashira T. Ideue Y. Iwasa N. Mitsuishi K. Ishizaka S. Shin T. Miyake S. Murakami T. Sasagawa Takeshi Kondo Institute for Solid State Physics (ISSP) The University of Tokyo Kashiwa 277-8581 Japan Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Department of Physics Tokyo Institute of Technology Meguro-ku Tokyo 152-8551 Japan Tokodai Institute for Element Strategy (TIES) Tokyo Institute of Technology Meguro-ku Tokyo 152-8551 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako Saitama 351-0198 Japan Materials and Structures Laboratory (MSL) Tokyo Institute of Technology Yokohama Kanagawa 226-8503 Japan Graduate School of Science Hiroshima University Higashi-Hiroshima Hiroshima 739-8526 Japan Hiroshima Synchrotron Radiation Center (HiSOR) Hiroshima University Higashi-Hiroshima Hiroshima 739-0046 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Tohoku University Sendai 980-8577 Japan Research Center for Computational Design of Advanced Functional Materials (CD-FMat) AIST Tsukuba Ibaraki 305-8568 Japan AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL) Kashiwa Chiba 277-8581 Japan Trans-scale Quantum Science Institute The University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan

The chiral crystal is characterized by a lack of mirror symmetry and inversion center, resulting in the inequivalent right- and left-handed structures. In the noncentrosymmetric crystal structure, the spin and momentum of electrons are expected to be locked in the reciprocal space with the help of the spin-orbit interaction. To reveal the spin textures of chiral crystals, we investigate the spin and electronic structure in a p-type semiconductor, elemental tellurium, with the simplest chiral structure by using spin- and angle-resolved photoemission spectroscopy. Our data demonstrate that the highest valence band crossing the Fermi level has a spin component parallel to the electron momentum around the Brillouin zone corners. Significantly, we have also confirmed that the spin polarization is reversed in the crystal with the opposite chirality. The results indicate that the spin textures of the right- and left-handed chiral crystals are hedgehoglike, leading to unconventional magnetoelectric effects and nonreciprocal phenomena.

关键词： Spin-orbit coupling Elemental semiconductors Angle-resolved photoemission spectroscopy Spin-resolved photoemission spectroscopy

The need to implement FAIR principles in biomolecular simulations

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arXiv 2024年

作者： Amaro, R. Åqvist, J. Bahar, I. Battistini, F. Bellaiche, A. Beltran, D. Biggin, P.C. Bonomi, M. Bowman, G.R. Bryce, R. Bussi, G. Carloni, P. Case, D. Cavalli, A. Chang, C.A. Cheatham, T.E. Cheung, M.S. Chipot, C. Chong, L.T. Choudhary, P. Cisneros, G.A. Clementi, C. Collepardo-Guevara, R. Coveney, P. Covino, R. Crawford, T.D. Dal Peraro, M. de Groot, B. Delemotte, L. De Vivo, M. Essex, J. Fraternali, F. Gao, J. Gelpí, J.L. Gervasio, F.L. Gonzalez-Nilo, F.D. Grubmüller, H. Guenza, M.G. Guzman, H.V. Harris, S. Head-Gordon, T. Hernandez, R. Hospital, A. Huang, N. Huang, X. Hummer, G. Iglesias-Fernández, J. Jensen, J.H. Jha, S. Jiao, W. Jorgensen, W.L. Kamerlin, S.C.L. Khalid, S. Laughton, C. Levitt, M. Limongelli, V. Lindahl, E. Lindorff-Larsen, K. Loverde, S. Lundborg, M. Luo, Y.L. Luque, F.J. Lynch, C.I. MacKerell, A. Magistrato, A. Marrink, S.J. Martin, H. McCammon, J.A. Merz, K. Moliner, V. Mulholland, A. Murad, S. Naganathan, A.N. Nangia, S. Noe, F. Noy, A. Oláh, J. O'Mara, M. Ondrechen, M.J. Onuchic, J.N. Onufriev, A. Osuna, S. Palermo, G. Panchenko, A.R. Pantano, S. Parish, C. Parrinello, M. Perez, A. Perez-Acle, T. Perilla, J.R. Pettitt, B.M. Pietropaolo, A. Piquemal, J.-P. Poma, A. Praprotnik, M. Ramos, M.J. Ren, P. Reuter, N. Roitberg, A. Rosta, E. Rovira, C. Roux, B. Röthlisberger, U. Sanbonmatsu, K. Schlick, T. Shaytan, A.K. Simmerling, C. Smith, J.C. Sugita, Y. Świderek, K. Taiji, M. Tao, P. Tikhonova, I.G. Tirado-Rives, J. Tuñón, I. Van Der Kamp, M.W. Van der Spoel, D. Velankar, S. Voth, G.A. Wade, R. Warshel, A. Welborn, V.V. Wetmore, S. Wong, C.F. Yang, L.-W. Zacharias, M. Orozco, M. Department of Molecular Biology University of California San DiegoCA United States Department of Cell and Molecular Biology Uppsala University Uppsala Sweden Laufer Center for Physical and Quantitative Biology Renaissance School of Medicine Stony Brook University Stony BrookNY United States Department of Biochemistry and Cell Biology Renaissance School of Medicine Stony Brook University Stony BrookNY United States Barcelona Spain European Molecular Biology Laboratory European Bioinformatics Institute Hinxton United Kingdom Structural Bioinformatics and Computational Biochemistry Department of Biochemistry University of Oxford Oxford United Kingdom Institut Pasteur Université Paris Cité CNRS UMR 3528 Computational Structural Biology Unit Paris France Department of Biochemistry and Biophysics University of Pennsylvania PhiladelphiaPA United States Division of Pharmacy and Optometry University of Manchester Manchester United Kingdom Scuola Internazionale Superiore di Studi Avanzati-SISSA Trieste Italy Computational Biomedicine Institute of Advanced Simulations IAS-5 Institute for Neuroscience and Medicine INM-9 Forschungszentrum Jülich GmbH Jülich Germany Department of Physics and Universitätsklinikum RWTH Aachen University Aachen Germany Department of Chemistry & Chemical Biology Rutgers University PiscatawayNJ United States Istituto Italiano di Tecnologia Drug Discovery and Development Bologna Italy Lausanne Switzerland Department of Chemistry University of California RiversideCA United States Department of Medicinal Chemistry College of Pharmacy University of Utah Salt Lake CityUT United States Department of Physics University of Washington SeattleWA United States Pacific Northwest National Laboratory RichlandWA United States LIA CNRS-UIUC UMR n°7019 Université de Lorraine Vandœuvre-lès-Nancy France Department of Physics University of Illinois at Urbana-Champaign UrbanaIL United States Department of Biochemistry and Molecular Biol

The communities that embraced data archiving efforts decades ago are now, in the era of data-driven biology, those gaining the most from the AI revolution. The structural biology community was a pioneer in this regard by establishing the Protein Data Bank (PDB) in 1971 and making data accessible using the FAIR (Findable, Accessible, Interoperable and Reusable) principles even before these were articulated [1, 2]. The genomics/bioinformatics community has followed the example, establishing many widely used databases [3, 4]. By contrast, molecular simulation has been anchored in usage paradigms dating back to the seventies, when molecular dynamics (MD) simulation was first applied to study biomacromolecules [5]. At that time, MD was used by theoretical physicists and chemists in "proof of concept" simulations. Still, fifty years later, MD has evolved into a cornerstone molecular biology technique that can provide accurate quantitative analysis and property prediction. MD is now employed by tens of thousands of researchers worldwide, accounting for roughly 15% of global supercomputer usage. Unfortunately, these rich and costly data are not systematically maintained, and when further analyses are required, simulations have to be rerun-an unacceptable situation from scientific, environmental and sustainability standpoints. In this letter, we argue for a collaborative endeavor to archive MD simulation data and describe ongoing efforts to establish cost-effective and sustainable data archiving strategies. © 2024, CC BY-NC-SA.

关键词： Biotic

Quantitative Prediction of Aggregation-Induced Emission: A Full Quantum Mechanical Approach to the Optical Spectra

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advanced Materials 2020年第28期59卷 11647-11652页

作者： Zhang, Wei Liu, Jinfeng Jin, Xinsheng Gu, Xinggui Zeng, Xiao Cheng He, Xiao Li, Hui Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai200062 China Department of Basic Medicine and Clinical Pharmacy China Pharmaceutical University Nanjing210009 China Department of Chemistry University of Nebraska LincolnNE68588 United States NYU-ECNU Center for Computational Chemistry at NYU Shanghai Shanghai200062 China

Full quantum mechanical (FQM) calculation of the excited state of aggregation-induced-emission (AIE) materials is highly sought but still a challenging tosh Herein, we employed the recently developed electrostatically embedded generalized molecular fractionation (EE-GMF) method, a method based on the systematic fragmentation approach, to predict, for the first time, the spectra of a prototype AIE fluorophore: di(p-methoxylphenyl)dibenzofidvene (FTPE). Compared to the single molecular or QM/MM calculations, the EE-GMF method shows significantly improved accuracy, nearly reproducing the experimental optical spectra of FTPE in both condensed phases. Importantly, we show that the conventional restriction of the intramolecular rotation mechanism cannot fully account for AIE, whereas the two-body intermolecular quantum mechanical interaction plays a crucial role in AIE. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Emission spectroscopy

An improved evaluation of the neutron background in the PandaX-Ⅱ experiment

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science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 54-63页

作者： QiuHong Wang Abdusalam Abdukerim Wei Chen Xun Chen YunHua Chen XiangYi Cui YingJie Fan DeQing Fang ChangBo Fu LiSheng Geng Karl Giboni Franco Giuliani LinHui Gu XuYuan Guo Ke Han ChangDa He Di Huang Yan Huang YanLin Huang Zhou Huang Peng Ji XiangDong Ji YongLin Ju YiHui Lai Kun Liang HuaXuan Liu JiangLai Liu WenBo Ma YuGang Ma YaJun Mao Yue Meng Parinya Namwongsa KaiXiang Ni JinHua Ning XuYang Ning XiangXiang Ren ChangSong Shang Lin Si AnDi Tan AnQing Wang HongWei Wang Meng Wang SiGuang Wang XiuLi Wang Zhou Wang MengMeng Wu ShiYong Wu JingKai Xia MengJiao Xiao PengWei Xie BinBin Yan JiJun Yang Yong Yang ChunXu Yu Jumin Yuan Dan Zhang HongGuang Zhang Tao Zhang Li Zhao QiBin Zheng JiFang Zhou Ning Zhou XiaoPeng Zhou Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China INPAC and School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai Laboratory for Particle Physics and CosmologyShanghai 200240China Yalong River Hydropower Development Company Ltd.Chengdu 610051China School of Physics Nankai UniversityTianjin 300071China School of Physics&International Research Center for Nuclei and Particles in the Cosmos&Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Tsung-Dao Lee Institute Shanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics Peking UniversityBeijing 100871China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China Center of High Energy Physics Peking UniversityBeijing 100871China University of Chinese Academy of Sciences Beijing 100049China

In dark matter direct detection experiments,neutron is a serious source of background,which can mimic the dark matter-nucleus scattering *** this paper,we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel *** of fully relying on the Monte Carlo simulation,the overall neutron background is determined from the neutron-induced high energy signals in the *** addition,the probability of producing a dark-matter-like background per neutron is evaluated with a complete Monte Carlo generator,where the correlated emission of neutron(s)andγ(s)in the(α,n)reactions and spontaneous fissions is taken into *** this method,the neutron backgrounds in the Run 9(26-ton-day)and Run 10(28-ton-day)data sets of PandaX-II are estimated to be(0.66±0.24)and(0.47±0.25)events,respectively.

关键词： dark matter direct detection xenon neutron background high energy gamma neutron generator