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Pressure-induced transition from Jeff=1/2 to S=1/2 states in CuAl2O4

Physical Review B 2021年第8期103卷 L081101-L081101页

作者： Hwanbeom Cho Choong H. Kim Yongmoon Lee Kazuki Komatsu Byeong-Gwan Cho Deok-Yong Cho Taehun Kim Chaebin Kim Younghak Kim Tae Yeong Koo Yukio Noda Hiroyuki Kagi Daniel I. Khomskii Donghoon Seoung Je-Geun Park Clarendon Laboratory University of Oxford Parks Road Oxford OX1 3PU United Kingdom Center for Correlated Electron Systems Institute for Basic Science (IBS) Seoul 08826 Republic of Korea Department of Physics and Astronomy Seoul National University Seoul 08826 Republic of Korea Department of Geological Sciences Pusan National University Busan 46241 Republic of Korea Geochemical Research Center Graduate School of Science The University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan Pohang Accelerator Laboratory POSTECH Pohang 37673 Republic of Korea IPIT & Department of Physics Jeonbuk National University Jeonju 54896 Republic of Korea Center for Quantum Materials Seoul National University Seoul 08826 Republic of Korea Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai 980-8577 Japan II. Physikalisches Institut Universität zu Köln D-50937 Köln Germany Department of Earth and Environmental Sciences Chonnam National University Gwangju 61186 Republic of Korea Institute of Applied Physics Seoul National University Seoul 08826 Republic of Korea

The spin-orbit entangled (SOE) Jeff state has been a fertile ground to study quantum phenomena. Contrary to the conventional weakly correlated Jeff=1/2 state of 4d and 5d transition metal compounds, the ground state of CuAl2O4 hosts a Jeff=1/2 state with a strong correlation of Coulomb U. Here, we report that, surprisingly, Cu2+ ions of CuAl2O4 overcome the otherwise usually strong Jahn-Teller distortion and instead stabilize the SOE state, although the cuprate has relatively small spin-orbit coupling. From the x-ray absorption spectroscopy and high-pressure x-ray diffraction studies, we obtained definite evidence of the Jeff=1/2 state with a cubic lattice at ambient pressure. We also found the pressure-induced structural transition to a compressed tetragonal lattice consisting of the spin-only S=1/2 state for pressure Pc>8GPa. This phase transition from the Mott insulating Jeff=1/2 to the S=1/2 states is a unique phenomenon. Our study offers an example of the SOE Jeff state under strong electron correlation and its pressure-induced transition to the S=1/2 state.

关键词： Pressure effects Quantum phase transitions Spin-orbit coupling Spinels Crystal structures Density functional theory Pressure techniques X-ray absorption spectroscopy X-ray diffraction

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Revisiting the A-type antiferromagnet NaNiO2 with muon spin rotation measurements and density functional theory calculations

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Physical Review B 2020年第18期102卷 184412-184412页

作者： Ola Kenji Forslund Hiroto Ohta Kazuya Kamazawa Scott L. Stubbs Oren Ofer Martin Månsson Chishiro Michioka Kazuyoshi Yoshimura Bassam Hitti Donald Arseneau Gerald D. Morris Eduardo J. Ansaldo Jess H. Brewer Jun Sugiyama Department of Applied Physics KTH Royal Institute of Technology SE-10691 Stockholm Sweden Engineering Education Research Center Graduate School of Engineering Kyoto University Kyoto 615-8530 Japan Department of Chemistry Graduate School of Science Kyoto University Kyoto 606-8502 Japan CROSS Neutron Science and Technology Center Tokai Ibaraki 319-1106 Japan Department of Physics & Astronomy University of British Columbia Vancouver British Columbia Canada V6T 1Z1 TRIUMF 4004 Wesbrook Mall Vancouver British Columbia Canada V6T 2A3 Department of Physics & Engineering Physics University of Saskatchewan Saskatoon Saskatchewan Canada S7N 5E2 Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan High Energy Accelerator Research Organization (KEK) Tokai Ibaraki 319-1106 Japan

An A-type antiferromagnet, NaNiO2, was examined by means of positive muon spin rotation and relaxation (μ+SR) measurements and first-principles calculations based on a density functional theory (DFT). Below TN=20 K, a clear muon spin precession signal was observed in the μ+SR time spectrum recorded under zero field, due to the formation of a static internal magnetic field. The microscopic origin of such an internal field was computed as a sum of dipolar and hyperfine contact fields at the site (0.624, 0, 0.854), where both the muon site and the local spin density at such a site were predicted with DFT calculations. While the computed values were consistent with experimentally obtained ones, in both the antiferromagnetic and the paramagnetic states, the contribution of the hyperfine contact field was shown to be insignificant even below TN. Finally, measurements at higher temperatures signified thermally activated Na-ion diffusion with Ea=50(20) meV and DNa(300K)=8.8×10−11cm2/s, commonly observed in layered-type compounds.

关键词： Antiferromagnetism Dipolar interaction Self-diffusion Antiferromagnets Density functional calculations Muon spin resonance

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Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz

arXiv

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arXiv 2021年

作者： Holoien, Thomas W.-S. Neustadt, Jack M.M. Vallely, Patrick J. Auchettl, Katie Hinkle, Jason T. Romero-Cañizales, Cristina Shappee, Benjamin J. Kochanek, Christopher S. Stanek, K.Z. Chen, Ping Dong, Subo Prieto, Jose L. Thompson, Todd A. Brink, Thomas G. Filippenko, Alexei V. Zheng, Weikang Bersier, David Bose, Subhash Burgasser, Adam J. Channa, Sanyum De Jaeger, Thomas Hestenes, Julia Im, Myungshin Jeffers, Benjamin Jun, Hyunsung D. Lansbury, George Post, Richard S. Ross, Timothy W. Stern, Daniel Tang, Kevin Tucker, Michael A. Valenti, Stefano Yunus, Sameen Zhang, Keto D. The Observatories of the Carnegie Institution for Science 813 Santa Barbara St. PasadenaCA91101 United States Department of Astronomy The Ohio State University 140 West 18th Avenue ColumbusOH43210 United States School of Physics The University of Melbourne ParkvilleVIC3010 Australia Department of Astronomy and Astrophysics University of California Santa CruzCA95064 United States Institute for Astronomy University of Hawai'i 2680 Woodlawn Drive HonoluluHI96822 United States Institute of Astronomy and Astrophysics Academia Sinica 11F of Astronomy-Mathematics Building AS/NTU No. 1 Roosevelt Rd Taipei10617 Taiwan The Ohio State University 191 W. Woodruff Ave. ColumbusOH43210 United States Kavli Institute for Astronomy and Astrophysics Peking University Yi He Yuan Road 5 Hai Dian District Beijing100871 China Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias Universidad Diego Portales Av. Ejército 441 Santiago Chile Millennium Institute of Astrophysics Santiago Chile Department of Astronomy University of California BerkeleyCA94720-3411 United States Miller Institute for Basic Research in Science University of California BerkeleyCA94720 United States Astrophysics Research Institute Liverpool John Moores University 146 Brownlow Hill LiverpoolL3 5RF United Kingdom Center for Astrophysics and Space Sciences University of California San Diego La Jolla CA92093 United States Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027-6623 United States SNU Astronomy Research Center Astronomy Program Dept. of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of School of Physics Korea Institute for Advanced Study 85 Hoegiro Dongdaemun-gu Seoul02455 Korea Republic of European Southern Observatory Karl-Schwarzschild-Strasse 2 GarchingD-85748 Germany Post Observatory LexingtonMA02421 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oa

We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object's evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSS J171955.84+414049.4 on UT 2017 July 27 at a redshift of z = 0:1641. The transient peaked at an absolute B-band magnitude of MB,peak=-22:81, corresponding to a bolometric luminosity of Lbol,peak= 8.3×1044erg s-1, and exhibited late-time ultraviolet emission that was still ongoing in our latest observations. Integrating the full light curve gives a total emitted energy of Etot= (1.36±0.08)×1052erg, with (0.80±0.02)×1052erg of this emitted within 200 days of peak light. This late-time ultraviolet emission is accompanied by increasing X-ray emission that becomes softer as it brightens. ASASSN-17jz exhibited a large number of spectral emission lines most commonly seen in active galactic nuclei (AGNs) with little evidence of evolution. It also showed transient Balmer features which became fainter and broader over time, and are still being detected > 1000 days after peak brightness. We consider various physical scenarios for the origin of the transient, including supernovae (SNe), tidal disruption events (TDEs), AGN outbursts, and ANTs. We find that the most likely explanation is that ASASSN-17jz was an SN IIn occurring in or near the disk of an existing AGN, and that the late-time emission is caused by the AGN transitioning to a more active state. Copyright © 2021, The Authors. All rights reserved.

关键词： Supernovae

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A workshop on the next-generation environmental satellite constellations

A workshop on the next-generation environmental satellite co...

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作者： Rehbein, Amanda Rugna, Martín Hobouchian, M. Paula Del Moral, Anna Goodman, Steven J. Lindsey, Daniel T. Thomas, Janel Institute of Astronomy Geophysics and Atmospheric Sciences Department of Atmospheric Sciences University of São Paulo São Paulo Brazil Servicio Meteorológico Nacional Buenos Aires Argentina Department of Applied Physics University of Barcelona Barcelona Spain GOES-R Program Office/TGA Owens Cross Roads AL United States NOAA NESDIS Center for Satellite Applications and Research Regional and Mesoscale Meteorology Branch Fort CollinsCO United States NOAA NESDIS GOES-R Science and Technology Corp. GreenbeltMD United States

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Proton-He3 elastic scattering at intermediate energies

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Physical Review C 2021年第4期103卷 044001-044001页

作者： A. Watanabe S. Nakai Y. Wada K. Sekiguchi A. Deltuva T. Akieda D. Etoh M. Inoue Y. Inoue K. Kawahara H. Kon K. Miki T. Mukai D. Sakai S. Shibuya Y. Shiokawa T. Taguchi H. Umetsu Y. Utsuki M. Watanabe S. Goto K. Hatanaka Y. Hirai T. Ino D. Inomoto A. Inoue S. Ishikawa M. Itoh H. Kanda H. Kasahara N. Kobayashi Y. Maeda S. Mitsumoto S. Nakamura K. Nonaka H. J. Ong H. Oshiro Y. Otake H. Sakai A. Taketani A. Tamii D. T. Tran T. Wakasa Y. Wakabayashi T. Wakui Department of Physics Tohoku University Sendai 980-8578 Japan Graduate Program on Physics for the Universe (GP-PU) Tohoku University Sendai 980-8578 Japan Institute of Theoretical Physics and Astronomy Vilnius University Saulėtekio al. 3 LT-10257 Vilnius Lithuania Department of Physics Kyushu University Fukuoka 819-0395 Japan Research Center for Nuclear Physics Osaka University Ibaraki 567-0047 Japan High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan Science Research Center Hosei University Tokyo 102-8160 Japan Cyclotron and Radioisotope Center Tohoku University Sendai 980-8578 Japan Faculty of Engineering University of Miyazaki Miyazaki 889-2192 Japan Institute of Modern Physics (IMP) Chinese Academy of Sciences Lanzhou 730000 China RIKEN Center for Advanced Photonics Wako 351-0198 Japan RIKEN Nishina Center Wako 351-0198 Japan National Institute of Radiological Science Chiba 263-8555 Japan

We present a precise measurement of the cross section, proton and He3 analyzing powers, and spin correlation coefficient Cy,y for p−He3 elastic scattering near 65 MeV, and a comparison with rigorous four-nucleon scattering calculations based on realistic nuclear potentials and a model with Δ-isobar excitation. Clear discrepancies are seen in some of the measured observables in the regime around the cross section minimum. Theoretical predictions using scaling relations between the calculated cross section and the He3 binding energy are not successful in reproducing the data. Large sensitivity to the NN potentials and rather small Δ-isobar effects in the calculated cross section are noticed as different features from those in the deuteron-proton elastic scattering. The results obtained above indicate that p−He3 scattering at intermediate energies is an excellent tool to explore nuclear interactions not accessible by three-nucleon scattering.

关键词： Few-body systems H & He induced nuclear reactions Nuclear forces Nucleon-nucleon interactions Polarization phenomena

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Measurement of Azimuthal Anisotropy of Muons from Charm and Bottom Hadrons in pp Collisions at s=13 TeV with the ATLAS Detector

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Physical Review Letters 2020年第8期124卷 082301-082301页

作者： G. Aad B. Abbott D. C. Abbott A. Abed Abud K. Abeling D. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya B. Achkar S. Adachi L. Adam C. Adam Bourdarios L. Adamczyk L. Adamek J. Adelman M. Adersberger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov W. S. Ahmed X. Ai G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alberghi J. Albert M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa D. Alexandre T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. Alvarez Estevez D. Álvarez Piqueras M. G. Alviggi Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders A. Andreazza V. Andrei C. R. Anelli S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony E. Antipov M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz R. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armbruster A. Armstrong O. Arnaez H. Arnold Z. P. Arrubarrena Tame A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. B. Atlay H. Atmani K. Augsten G. Avolio R. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos H. Bachacou K. Bachas M. Backes F. Backman P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey V. R. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker D. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio D. Barberis M. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto ON Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAPP Université Grenoble Alpes Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPC Université Clermont Auvergne CNRS/IN2P3 Cl

The elliptic flow of muons from the decay of charm and bottom hadrons is measured in pp collisions at s=13 TeV using a data sample with an integrated luminosity of 150 pb−1 recorded by the ATLAS detector at the LHC. The muons from heavy-flavor decay are separated from light-hadron decay muons using momentum imbalance between the tracking and muon spectrometers. The heavy-flavor decay muons are further separated into those from charm decay and those from bottom decay using the distance-of-closest-approach to the collision vertex. The measurement is performed for muons in the transverse momentum range 4–7 GeV and pseudorapidity range |η|<2.4. A significant nonzero elliptic anisotropy coefficient v2 is observed for muons from charm decays, while the v2 value for muons from bottom decays is consistent with zero within uncertainties.

关键词： Collective flow Jets & heavy flavor physics Particle correlations & fluctuations Relativistic heavy-ion collisions

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Deep learning inference with the Event Horizon Telescope I. Calibration improvements and a comprehensive synthetic data library

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astronomy and Astrophysics 2025年第1期698卷

作者： Janssen, M. Chan, C.K. Davelaar, J. Natarajan, I. Olivares, H. Ripperda, B. Röder, J. Rynge, M. Wielgus, M. Department of Astrophysics Institute for Mathematics Astrophysics and Particle Physics (IMAPP) Radboud University PO Box 9010 Nijmegen 6500 GL Netherlands Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 Bonn 53121 Germany Steward Observatory Department of Astronomy University of Arizona 933 N. Cherry Ave. Tucson 85721 AZ United States Data Science Institute University of Arizona 1230 N. Cherry Ave. Tucson 85721 AZ United States Program in Applied Mathematics University of Arizona 617 N. Santa Rita Ave. Tucson 85721 AZ United States Department of Astrophysical Sciences Peyton Hall Princeton University Princeton 08544 NJ United States Center for Astrophysics Harvard & Smithsonian 60 Garden Street Cambridge 02138 MA United States Black Hole Initiative Harvard University 20 Garden Street Cambridge 02138 MA United States Canadian Institute for Theoretical Astrophysics University of Toronto Toronto M5S 3H8 ON Canada Department of Astronomy University of Toronto 50 St. George Street Toronto M5S 3H4 ON Canada Department of Physics University of Toronto 60 St. George Street Toronto M5S 1A7 ON Canada Perimeter Institute for Theoretical Physics Waterloo N2L 2Y5 ON Canada University of Southern California – Information Sciences Institute 4676 Admiralty Way Suite 1001 Marina del Rey 90292 CA United States Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada 18008 Spain Departamento de Matemática da Universidade de Aveiro Centre for Research and Development in Mathematics and Applications (CIDMA) Campus de Santiago Aveiro 3810-193 Portugal

Context. In a series of publications, we describe a comprehensive comparison of Event Horizon Telescope (EHT) data with theoretical models of the observed Sagittarius A* (Sgr A^∗) and Messier 87* (M87^∗) horizon-scale sources. Aims. In this article, we report on improvements made to our observational data reduction pipeline and present the generation of observables derived from the EHT models. We make use of ray-traced general relativistic magnetohydrodynamic simulations that are based on different black hole spacetime metrics and accretion physics parameters. These broad classes of models provide a good representation of the primary targets observed by the EHT. Methods. We describe how we combined multiple frequency bands and polarization channels of the observational data to improve our fringe-finding sensitivity and stabilization of atmospheric phase fluctuations. To generate realistic synthetic data from our models, we took the signal path as well as the calibration process, and thereby the aforementioned improvements, into account. We could thus produce synthetic visibilities akin to calibrated EHT data and identify salient features for the discrimination of model parameters. Results. We have produced a library consisting of an unparalleled 962 000 synthetic Sgr A^∗ and M87^∗ datasets. In terms of baseline coverage and noise properties, the library encompasses 2017 EHT measurements as well as future observations with an extended telescope array. Conclusions. We differentiate between robust visibility data products related to model features and data products that are strongly affected by data corruption effects. Parameter inference is mostly limited by intrinsic model variability, which highlights the importance of long-term monitoring observations with the EHT. In later papers in this series, we will show how a Bayesian neural network trained on our synthetic data is capable of dealing with the model variability and extra

关键词： accretion, accretion disks black hole physics galaxies: active techniques: high angular resolution techniques: interferometric

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Effect of annealing on hydrothermally deposited Co 3 O 4 -ZnO thin films for supercapacitor applications

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Materials Today: Proceedings 2021年 36卷 374-378页

作者： Raphael M. Obodo Ugochi Chime Agnes C. Nkele Assumpta C. Nwanya A.K.H Bashir I.G. Madiba M. Asjad I. Ahmad T. Zhao N. Thovhogi Fabian I. Ezema Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria National Center for Physics Islamabad 44000 Pakistan NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure road Somerset West 7129 P.O. Box 722 Somerset West Western Cape Province South Africa UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk ridge P.O. Box 392 Pretoria South Africa Biomedical Research and Innovation Platform South African Medical Research Council (SAMRC) Private Bag 19070 Tygerberg 7505 Western Cape Province South Africa Department of Physics Faculty of Natural and Applied Sciences Coal City University Enugu Nigeria

Co 3 O 4 -ZnO thin films were synthesis using hydrothermal technique in an alkaline bath. The alkalinity of the reaction bath was maintained at pH values of 10 and 12 using an aqueous ammonia solution. Fabricated films were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–visible spectroscopy for morphological, structural and optical properties of the fabricated thin films respectively. Electrochemical behaviour of the films were studied using potentiostat to carry out its cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge discharge (GCD) to ascertain its usefulness as supercapacitors electrodes materials. The maximum specific capacitance of 730 F/g and electrode resistance of 0.0076 Ω electrode was obtained. Calculated values of the band gap energy, specific capacitance and its resistance indicate its possible applications in photovoltaic energy storage systems and supercapacitors.

关键词： Cobalt oxide Hydrothermal Supercapacitor Cyclic voltammetry Power density

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Study of surfaces of insulating materials by near-edge X-ray absorption fine structure spectroscopy in total-electron-yield mode

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Nuclear Instruments and Methods in physics Research Section B: Beam Interactions with Materials and Atoms 2025年 566卷

作者： Eiichi Kobayashi Osamu Takahashi Kyoko K. Bando Koji K. Okudaira Satoru Yoshioka Kyushu Synchrotron Light Research Center 8-7 Yayoigaoka Tosu Saga 841-0005 Japan Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima Hiroshima 739-8526 Japan National Institute of Advanced Industrial Science and Technology Higashi Tsukuba Ibaraki 305-8565 Japan Chiba University Chiba Chiba 263-8522 Japan Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Fukuoka 819-0395 Japan

We analyzed the surfaces of insulating materials using near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in total-electron-yield (TEY) mode. Conventionally, insulating materials such as glass and ceramics prepared for NEXAFS analysis by the TEY method are ground and fixed in a sample holder to avoid charging. However, this method is not suitable for analysis of chemically treated surfaces because of surface contamination and changes in the chemical state or structure of the sample. Therefore, by placing a gold mesh on the sample surface, we obtained a normal spectrum without surface contamination and without the effects of charge-up. A comparison with theoretical calculations revealed that OH groups are mainly adsorbed onto the insulator surface exposed to the atmosphere.

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Search for Magnetic Monopoles and Stable High-Electric-Charge Objects in 13 Tev Proton-Proton Collisions with the ATLAS Detector

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Physical Review Letters 2020年第3期124卷 031802-031802页

作者： G. Aad B. Abbott D. C. Abbott O. Abdinov A. Abed Abud K. Abeling D. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya B. Achkar S. Adachi L. Adam C. Adam Bourdarios L. Adamczyk L. Adamek J. Adelman M. Adersberger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov W. S. Ahmed X. Ai G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alberghi J. Albert M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa D. Alexandre T. Alexopoulos A. Alfonsi M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. Alvarez Estevez D. Álvarez Piqueras M. G. Alviggi Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders A. Andreazza V. Andrei C. R. Anelli S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz R. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. B. Atlay H. Atmani K. Augsten G. Avolio R. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos M. J. Baca H. Bachacou K. Bachas M. Backes F. Backman P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey V. R. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker D. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio D. Barberis M. Barbero T. Barillari CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA LPC Université Clermont Auvergne CNRS/IN2P3 Clermont-Ferran

A search for magnetic monopoles and high-electric-charge objects is presented using 34.4 fb−1 of 13 TeV pp collision data collected by the ATLAS detector at the LHC during 2015 and 2016. The considered signature is based upon high ionization in the transition radiation tracker of the inner detector associated with a pencil-shape energy deposit in the electromagnetic calorimeter. The data were collected by a dedicated trigger based on the tracker high-threshold hit capability. The results are interpreted in models of Drell-Yan pair production of stable particles with two spin hypotheses (0 and 1/2) and masses ranging from 200 to 4000 GeV. The search improves by approximately a factor of 5 the constraints on the direct production of magnetic monopoles carrying one or two Dirac magnetic charges and stable objects with electric charge in the range 20≤|z|≤60 and extends the charge range to 60<|z|≤100.

关键词： Charge Particle production Magnetic monopoles Hadron colliders

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