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arXiv 2019年

作者： Wen, Jiaxing Long, Xiangyun Zheng, Xutao An, Yu Cai, Zhengyang Cang, Jirong Che, Yuepeng Chen, Changyu Chen, Liangjun Chen, Qianjun Chen, Ziyun Cheng, Yingjie Deng, Litao Deng, Wei Ding, Wenqing Du, Hangci Duan, Lian Gan, Quan Gao, Tai Gao, Zhiying Han, Wenbin Han, Yiying He, Xinbo He, Xinhao Hou, Long Hu, Fan Hu, Junling Huang, Bo Huang, Dongyang Huang, Xuefeng Jia, Shihai Jiang, Yuchen Jin, Yifei Li, Ke Li, Siyao Li, Yurong Liang, Jianwei Liang, Yuanyuan Lin, Wei Liu, Chang Liu, Gang Liu, Mengyuan Liu, Rui Liu, Tianyu Liu, Wanqiang Lu, Di'an Lu, Peiyibin Lu, Zhiyong Luo, Xiyu Ma, Sizheng Ma, Yuanhang Mao, Xiaoqing Mo, Yanshan Nie, Qiyuan Qu, Shuiyin Shan, Xiaolong Shi, Gengyuan Song, Weiming Sun, Zhigang Tan, Xuelin Tang, Songsong Tao, Mingrui Wang, Boqin Wang, Yue Wang, Zhiang Wu, Qiaoya Wu, Xuanyi Xia, Yuehan Xiao, Hengyuan Xie, Wenjin Xu, Dacheng Xu, Rui Xu, Weili Yan, Longbiao Yan, Shengyu Yang, Dongxin Yang, Hang Yang, Haoguang Yang, Yi-Si Yang, Yifan Yao, Lei Yu, Huan Yu, Yangyi Zhang, Aiqiang Zhang, Bingtao Zhang, Lixuan Zhang, Maoxing Zhang, Shen Zhang, Tianliang Zhang, Yuchong Zhao, Qianru Zhao, Ruining Zheng, Shiyu Zhou, Xiaolong Zhu, Runyu Zou, Yu An, Peng Cai, Yifu Chen, Hongbing Dai, Zigao Fan, Yizhong Feng, Changqing Feng, Hua Gao, He Huang, Liang Kang, Mingming Li, Lixin Li, Zhuo Liang, Enwei Lin, Lin Lin, Qianqian Liu, Congzhan Liu, Hongbang Liu, Xuewen Liu, Yinong Lu, Xiang Mao, Shude Shen, Rongfeng Shu, Jing Su, Meng Sun, Hui Tam, Pak-Hin Tang, Chi-Pui Tian, Yang Wang, Fayin Wang, Jianjun Wang, Wei Wang, Zhonghai Wu, Jianfeng Wu, Xuefeng Xiong, Shaolin Xu, Can Yu, Jiandong Yu, Wenfei Yu, Yunwei Zeng, Ming Zeng, Zhi Zhang, Bin-Bin Zhang, Bing Zhao, Zongqing Zhou, Rong Zhu, Zonghong Department of Engineering Physics Center for Astrophysics Tsinghua University Beijing100084 China Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center Chinese Academy of Engineering Physics Mianyang621900 China Department of Physics Center for Astrophysics Tsinghua University Beijing100084 China Guangxi Key Laboratory for Relativistic Astrophysics Department of Physics Guangxi University NanningGuangxi530004 China School of Electronic and Information Engineering Ningbo University of Technology NingboZhejiang315211 China Department of Instruments Science & Engineering Shanghai Jiaotong University Shanghai200240 · China School of Materials Science & Chemical Engineering Ningbo University Ningbo315211 China School of Astronomy and Space Science Nanjing University NanjingJiangsu210093 China School of Aerospace Engineering Tsinghua University Beijing100084 China College of Physical Science and Technology Sichuan University Chengdu610065 China School of Physics and Astronomy Sun Yat-Sen University Zhuhai519082 China Department of Astronomy Xiamen University XiamenFujian361005 China School of Mathematics and Physics University of Science and Technology Beijing Beijing100083 China Department of Foreign Languages and Literatures Tsinghua University Beijing100084 China Department of Electrical Engineering Tsinghua University Beijing100084 China School of Software Tsinghua University Beijing100084 China Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo315211 China Department of Modern Physics School of Physical Sciences University of Science and Technology of China HefeiAnhui230026 China Department of Astronomy Beijing Normal University Beijing100875 China Department of Astronomy School of Physical Sciences University of Science and Technology of China HefeiAnhui230026 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210008 China Department of Astrono

The Gamma-Ray Integrated Detectors (GRID) is a space mission concept dedicated to monitoring the transient gamma-ray sky in the energy range from 10 keV to 2 MeV using scintillation detectors onboard CubeSats in low Earth orbits. The primary targets of GRID are the gamma-ray bursts (GRBs) in the local universe. The scientific goal of GRID is, in synergy with ground-based gravitational wave (GW) detectors such as LIGO and VIRGO, to accumulate a sample of GRBs associated with the merger of two compact stars and study jets and related physics of those objects. It also involves observing and studying other gamma-ray transients such as long GRBs, soft gamma-ray repeaters, terrestrial gamma-ray flashes, and solar flares. With multiple CubeSats in various orbits, GRID is unaffected by the Earth occultation and serves as a full-time and all-sky monitor. Assuming a horizon of 200 Mpc for ground-based GW detectors, we expect to see a few associated GW-GRB events per year. With about 10 CubeSats in operation, GRID is capable of localizing a faint GRB like 170817A with a 90% error radius of about 10 degrees, through triangulation and flux modulation. GRID is proposed and developed by students, with considerable contribution from undergraduate students, and will remain operated as a student project in the future. The current GRID collaboration involves more than 20 institutes and keeps growing. On August 29th, the first GRID detector onboard a CubeSat was launched into a Sun-synchronous orbit and is currently under test. Copyright © 2019, The Authors. All rights reserved.

关键词： Gravity waves

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Pseudorapidity profile of transverse momentum fluctuations in heavy ion collisions

引用

Physical Review C 2017年第1期96卷 014906-014906页

作者： Sandeep Chatterjee Piotr Bożek AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakow 30-059 Poland

We investigate pseudorapidity correlations of the average transverse flow of particles emitted in relativistic heavy-ion collisions. We employ 3+1-dimensional viscous relativistic hydrodynamics with initial conditions from the quark Glauber Monte Carlo model to confront the recent measurements on the pseudorapidity correlations of the average transverse momentum in Pb+Pb collisions at sNN=2760 GeV. We find good agreement between the model predictions and data. Further, we study two other observables build with the covariance of the average transverse momentum in different rapidity bins. These observables have better stability under various systematics, thus allowing for a robust comparison between data and model. The transverse flow-transverse flow correlation coefficient is directly related to correlations of the underlying collective flow at different pseudorapidities. The three-bin measure of pT factorization breaking in pseudorapidity gives an estimate of possible decorrelation of the average transverse flow in the longitudinal direction.

关键词： Collective flow Particle correlations & fluctuations Relativistic heavy-ion collisions Hydrodynamic models Monte Carlo methods

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Effect of bulk viscosity on interferometry correlations in ultrarelativistic heavy-ion collisions

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Physical Review C 2017年第5期95卷 054909-054909页

作者： Piotr Bożek AGH University of Science and Technology Faculty of Physics and Applied Computer Science Aleja Adama Mickiewicza 30 Krakow 30-059 Poland

A temperature-dependent bulk viscosity coefficient is used in 3+1-dimensional hydrodynamic simulations. I study the effect of the increase of bulk viscosity around the critical temperature on the system dynamics in central Pb+Pb collisions at sNN=2760 GeV. With increasing bulk viscosity the lifetime of the system increases slightly. Also the shape of the freeze-out hypersurface changes; the outer layers of the fireball live longer. This effect causes a small reduction of the ratio of two interferometry radii, Rout/Rside, improving the agreement with experimental data.

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

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Imaging backscattering in graphene quantum point contacts

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Physical Review B 2017年第16期96卷 165310-165310页

作者： A. Mreńca-Kolasińska B. Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 30-059 Kraków Poland

We study graphene quantum point contacts (QPCs) and imaging of the backscattering of the Fermi level wave function by potential introduced by a scanning probe. We consider both etched single-layer QPCs as well as the ones formed by bilayer patches deposited on the sides of the monolayer conducting channel. An atomistic tight-binding method is developed to effectively simulate an infinite graphene plane outside the QPCs using a computational box of a finite size. We demonstrate that in spite of the Klein phenomenon interference effects due to the backscattering at a circular n−p junction induced by the probe potential are visible in spatial conductance maps.

关键词： Ballistic transport Graphene Point contacts

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Observation of the 7H excited state

arXiv

引用

arXiv 2019年

作者： Bezbakh, A.A. Chudoba, V. Krupko, S.A. Belogurov, S.G. Biare, D. Fomichev, A.S. Gazeeva, E.M. Gorshkov, A.V. Grigorenko, L.V. Kaminski, G. Kiselev, O. Kostyleva, D.A. Kozlov, M.Y. Mauyey, B. Mukha, I. Muzalevskii, I.A. Nikolskii, E.Y. Parfenova, Yu L. Piatek, W. Quynh, A.M. Schetinin, V.N. Serikov, A. Sidorchuk, S.I. Sharov, P.G. Slepnev, R.S. Stepantsov, S.V. Swiercz, A. Szymkiewicz, P. Ter-Akopian, G.M. Wolski, R. Zalewski, B. Zhukov, M.V. Flerov Laboratory of Nuclear Reactions JINR Dubna141980 Russia Institute of Physics Silesian University in Opava Opava74601 Czech Republic SSC RF ITEP of NRC "Kurchatov Institute" Moscow117218 Russia National Research Nuclear University "MEPhI" Moscow115409 Russia Dubna State University Dubna141982 Russia National Research Centre "Kurchatov Institute" Kurchatov sq. 1 Moscow123182 Russia Heavy Ion Laboratory University of Warsaw Warsaw02-093 Poland GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt64291 Germany II. Physikalisches Institut Justus-Liebig-Universität Giessen35392 Germany Laboratory of Information Technologies JINR Dubna141980 Russia Nuclear Research Institute Dalat670000 Viet Nam AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow30-059 Poland Department of Physics Chalmers University of Technology GöteborgS-41296 Sweden

The 7H system was populated in the 2H(8He,3He)7H reaction with a 26 AMeV 8He beam. The 7H missing mass energy spectrum, the 3H energy and angular distributions in the 7H decay frame were reconstructed. The 7H missing mass spectrum shows a peak which can be interpreted either as unresolved 5/2+and 3/2+doublet or one of these states at 6.5(5) MeV. The data also provide indications on the 1/2+ ground state of 7H located at 2.0(5) MeV with quite a low population cross section of θcm-10 b/sr within angular range cm 6-30. Copyright © 2019, The Authors. All rights reserved.

关键词： Excited states

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Tuning parametric models of the atmospheric muon flux in MUPAGE to data from the KM3NeT detector 37

Tuning parametric models of the atmospheric muon flux in MUP...

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37th International Cosmic Ray Conference, ICRC 2021

作者： Fearraigh, Brían Ó. Ageron, M. Aiello, S. Albert, A. Alshamsi, M. Alves Garre, S. Aly, Z. Ambrosone, A. Ameli, F. Andre, M. Androulakis, G. Anghinolfi, M. Anguita, M. Anton, G. Ardid, M. Ardid, S. Assal, W. Aublin, J. Bagatelas, C. Baret, B. Basegmez du Pree, S. Bendahman, M. Benfenati, F. Berbee, E. van den Berg, A.M. Bertin, V. Beurthey, S. van Beveren, V. Biagi, S. Billault, M. Bissinger, M. Boettcher, M. Bou Cabo, M. Boumaaza, J. Bouta, M. Boutonnet, C. Bouvet, G. Bouwhuis, M. Bozza, C. Brânzaş, H. Bruijn, R. Brunner, J. Bruno, R. Buis, E. Buompane, R. Busto, J. Caiffi, B. Caillat, L. Calvo, D. Campion, S. Capone, A. Carduner, H. Carretero, V. Castaldi, P. Celli, S. Cereseto, R. Chabab, M. Champion, C. Chau, N. Chen, A. Cherubini, S. Chiarella, V. Chiarusi, T. Circella, M. Cocimano, R. Coelho, J.A.B. Coleiro, A. Colomer Molla, M. Colonges, S. Coniglione, R. Cosquer, A. Coyle, P. Cresta, M. Creusot, A. Cruz, A. Cuttone, G. D’Amico, A. Dallier, R. De Martino, B. De Palma, M. Di Palma, I. Díaz, A.F. Diego-Tortosa, D. Distefano, C. Domi, A. Donzaud, C. Dornic, D. Dörr, M. Drouhin, D. Eberl, T. Eddyamoui, A. van Eeden, T. van Eijk, D. El Bojaddaini, I. Eljarrari, H. Elsaesser, D. Enzenhöfer, A. Espinosa, V. Fermani, P. Ferrara, G. Filipović, M.D. Filippini, F. Fransen, J. Fusco, L.A. Gajanana, D. Gal, T. García Méndez, J. Garcia Soto, A. Garçon, E. Garufi, F. Gatius, C. Geißelbrecht, N. Gialanella, L. Giorgio, E. Gozzini, S.R. Gracia, R. Graf, K. Grella, G. Guderian, D. Guidi, C. Guillon, B. Gutiérrez, M. Haefner, J. Hallmann, S. Hamdaoui, H. van Haren, H. Heijboer, A. Hekalo, A. Hennig, L. Henry, S. Hernández-Rey, J.J. Hofestädt, J. Huang, F. Idrissi Ibnsalih, W. Ilioni, A. Illuminati, G. James, C.W. Janezashvili, D. Jansweijer, P. de Jong, M. de Jong, P. Jung, B.J. Kadler, M. Kalaczyński, P. Kalekin, O. Katz, U.F. Kayzel, F. Keller, P. Khan Chowdhury, N.R. Kistauri, G. van der Knaap, F. Nikhef National Institute for Subatomic Physics PO Box 41882 Amsterdam1009 DB Netherlands University of Amsterdam Institute of Physics IHEF PO Box 94216 Amsterdam1090 GE Netherlands Aix Marseille Univ CNRS IN2P3 CPPM Marseille France INFN Sezione di Catania Via Santa Sofia 64 Catania95123 Italy Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France Université de Paris CNRS Astroparticule et Cosmologie ParisF-75013 France c/Catedrático José Beltrán 2 Paterna Valencia46980 Spain INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy Università di Napoli "Federico II" Dip. Scienze Fisiche "E. Pancini" Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy INFN Sezione di Roma Piazzale Aldo Moro 2 Roma00185 Italy Universitat Politècnica de Catalunya Laboratori d’Aplicacions Bioacústiques Centre Tecnològic de Vilanova i la Geltrú Avda. Rambla Exposició s/n Vilanova i la Geltrú08800 Spain NCSR Demokritos Institute of Nuclear and Particle Physics Ag. Paraskevi Attikis Athens15310 Greece INFN Sezione di Genova Via Dodecaneso 33 Genova16146 Italy University of Granada Dept. of Computer Architecture and Technology CITIC Granada18071 Spain Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics Erwin-Rommel-Straße 1 Erlangen91058 Germany Universitat Politècnica de València Instituto de Investigación para la Gestión Integrada de las Zonas Costeras C/ Paranimf 1 Gandia46730 Spain Nikhef National Institute for Subatomic Physics PO Box 41882 Amsterdam1009 DB Netherlands University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battouta B.P. 1014 RabatR.P. 10000 Morocco INFN Sezione di Bologna v.le C. Berti-Pichat 6/2 Bologna40127 Italy Dipartimento di Fisica INFN Sezione di Padova Università di Padova PadovaI-35131 Italy Università di Bologna Dipartimento di Fisica e Astronomia v.le C. Berti-Pichat

The muons produced by cosmic ray interactions in the upper atmosphere constitute the most abundant signal for underwater neutrino detectors such as KM3NeT (the Cubic Kilometre Neutrino Telescope), which is currently being deployed in the Mediterranean Sea at two distinct locations. Situated at different depths, the KM3NeT/ARCA and KM3NeT/ORCA detectors experience a different flux of muons, and thus are uniquely positioned to study their evolution and propagation from cosmic ray showers. It is imperative to the main physics goals of the experiment that the atmospheric muon background is modelled correctly, which aids in benchmarking and understanding the detector response to the constant flux of these particles. In this study, the data from the KM3NeT/ORCA detector is used and compared with the Monte Carlo (MC) prediction from the MUPAGE (MUons from PArametric formulas: a fast GEnerator for neutrino telescopes) software package, which generates the energy spectrum, lateral distribution, and muon multiplicity of muon bundles according to a specific parametrisation at different depths below sea level. This parametrisation consists of many free parameters which can be tuned such that simulated physical observables in the detector agree with those measured in data. In this way, improvements to the data-MC agreement are achieved by quantitatively comparing the level of agreement between simulated and measured observables in the KM3NeT detector. © Copyright owned by the author(s).

关键词： Sea level

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A novel route to cyclic dominance in voluntary social dilemmas

arXiv

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arXiv 2020年

作者： Guo, Hao Song, Zhao Gecek, Suncana Li, Xuelong Jusup, Marko Perc, Matjaž Moreno, Yamir Boccaletti, Stefano Wang, Zhen School of Mechanical Engineering Northwestern Polytechnical University Xi'an710072 Northwestern Polytechnical University Xi'an710072 Division for Marine and Environmental Research Ruder Bošković Institute ZagrebHR-10002 Croatia School of Computer Science Northwestern Polytechnical University Xi'an710072 Institute of Innovative Research Tokyo Institute of Technology Tokyo152-8550 Japan Faculty of Natural Sciences and Mathematics University of Maribor Koroška cesta 160 Maribor2000 Slovenia Complexity Science Hub Vienna Josefstädterstraße 39 Vienna1080 Austria Department of Medical Research China Medical University Hospital China Medical University Taichung Taiwan University of Zaragoza Zaragoza50009 Spain Isi Foundation Turin10126 Italy Unmanned Systems Research Institute Northwestern Polytechnical University 710072Xi'an Cnr Institute of Complex Systems Via Madonna del Piano 10 Sesto Fiorentino Florence50019 Italy Moscow Institute of Physics and Technology National Research University Moscow Region141701 Russia

Cooperation is the backbone of modern human societies, making it a priority to understand how successful cooperation-sustaining mechanisms operate. Cyclic dominance, a non-transitive setup comprising at least three strategies wherein the first strategy overrules the second which overrules the third which, in turn, overrules the first strategy, is known to maintain bio-diversity, drive competition between bacterial strains, and preserve cooperation in social dilemmas. Here, we present a novel route to cyclic dominance in voluntary social dilemmas by adding to the traditional mix of cooperators, defectors, and loners, a fourth player type, risk-averse hedgers, who enact tit-for-tat upon paying a hedging cost to avoid being exploited. When this cost is sufficiently small, cooperators, defectors, and hedgers enter a loop of cyclic dominance that preserves cooperation even under the most adverse conditions. In contrast, when the hedging cost is large, hedgers disappear, consequently reverting to the traditional interplay of cooperators, defectors, and loners. In the interim region of hedging costs, complex evolutionary dynamics ensues, prompting transitions between states with two, three, or four competing strategies. Our results thus reveal that voluntary participation is but one pathway to sustained cooperation via cyclic dominance. Copyright © 2020, The Authors. All rights reserved.

关键词： Defects

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Dissipative transport of thermalized electrons through a nanodevice

引用

Physical Review B 2017年第7期96卷 075440-075440页

作者： M. Wołoszyn B. J. Spisak AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Krakow Poland

An equilibrium distribution function which corresponds to thermalization of electrons in contacts due to scattering processes is introduced for the purpose of reformulation of the inflow boundary conditions for the Wigner kinetic equation. The importance of the proposed concept for more realistic descriptions of transport phenomena in nanodevices is illustrated by determination of characteristics of the nanowire in cases of dissipative and dissipationless states of its active region. Quantitative results show how transport characteristics of the nanodevice are modified by the contacts.

关键词： Transport phenomena Nanowires Methods in transport

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Supernova neutrino detection in NOvA

arXiv

引用

arXiv 2020年

作者： Acero, M.A. Adamson, P. Agam, G. Aliaga, L. Alion, T. Allakhverdian, V. Anfimov, N. Antoshkin, A. Arrieta-Diaz, E. Asquith, L. Aurisano, A. Back, A. Backhouse, C. Baird, M. Balashov, N. Baldi, P. Bambah, B.A. Bashar, S. Bays, K. Bending, S. Bernstein, R. Bhatnagar, V. Bhuyan, B. Bian, J. Blair, J. Booth, A.C. Bour, P. Bowles, R. Bromberg, C. Buchanan, N. Butkevich, A. Bychkov, V. Calvez, S. Carroll, T.J. Catano-Mur, E. Childress, S. Choudhary, B.C. Coan, T.E. Colo, M. Corwin, L. Cremonesi, L. Davies, G.S. Derwent, P.F. Ding, P. Djurcic, Z. Dolce, M. Doyle, D. Dueñas Tonguino, D. Dukes, E.C. Dung, P. Duyang, H. Edayath, S. Ehrlich, R. Elkins, M. Feldman, G.J. Filip, P. Flanagan, W. Franc, J. Frank, M.J. Gallagher, H.R. Gandrajula, R. Gao, F. Germani, S. Giri, A. Gomes, R.A. Goodman, M.C. Grichine, V. Groh, M. Group, R. Guo, B. Habig, A. Hakl, F. Hall, A. Hartnell, J. Hatcher, R. Hatzikoutelis, A. Heller, K. Hewes, V. Himmel, A. Holin, A. Howard, B. Huang, J. Hylen, J. Jediny, F. Johnson, C. Judah, M. Kakorin, I. Kalra, D. Kaplan, D.M. Keloth, R. Klimov, O. Koerner, L.W. Kolupaeva, L. Kotelnikov, S. Kubu, M. Kullenberg, Ch. Kumar, A. Kuruppu, C.D. Kus, V. Lackey, T. Lang, K. Li, L. Lin, S. Lister, A. Lokajicek, M. Luchuk, S. Magill, S. Mann, W.A. Marshak, M.L. Martinez-Casales, M. Matveev, V. Mayes, B. Méndez, D.P. Messier, M.D. Meyer, H. Miao, T. Miller, W.H. Mishra, S.R. Mislivec, A. Mohanta, R. Moren, A. Morozova, A. Mualem, L. Muether, M. Mufson, S. Mulder, K. Murphy, R. Musser, J. Naples, D. Nayak, N. Nelson, J.K. Nichol, R. Nikseresht, G. Niner, E. Norman, A. Norrick, A. Nosek, T. Olshevskiy, A. Olson, T. Paley, J. Patterson, R.B. Pawloski, G. Petrova, O. Petti, R. Plunkett, R.K. Psihas, F. Rafique, A. Raj, V. Ramson, B. Rebel, B. Rojas, P. Ryabov, V. Samoylov, O. Sanchez, M.C. Sánchez Falero, S. Seong, I.S. Shanahan, P. Sheshukov, A. Singh, P. Singh, V. Smith, E. Argonne National Laboratory ArgonneIL60439 United States Universidad del Atlantico Carrera 30 No. 8-49 Puerto Colombia Atlantico Colombia Department of Physics Institute of Science Banaras Hindu University Varanasi221 005 India California Institute of Technology PasadenaCA91125 United States Charles University Faculty of Mathematics and Physics Institute of Particle and Nuclear Physics Prague Czech Republic Department of Physics University of Cincinnati CincinnatiOH45221 United States Department of Physics Cochin University of Science and Technology Kochi682 022 India Department of Physics Colorado State University Fort CollinsCO80523-1875 United States Czech Technical University in Prague Brehova 7 Prague 1115 19 Czech Republic University of Dallas 1845 E Northgate Drive IrvingTX75062 United States Department of Physics and Astrophysics University of Delhi Delhi110007 India Fermi National Accelerator Laboratory BataviaIL60510 United States Instituto de Física Universidade Federal de Goiás Goiás Goiânia74690-900 Brazil Department of Physics IIT Guwahati Guwahati781 039 India Department of Physics Harvard University CambridgeMA02138 United States Department of Physics University of Houston HoustonTX77204 United States Department of Physics IIT Hyderabad Hyderabad502 205 India School of Physics University of Hyderabad Hyderabad500 046 India Illinois Institute of Technology ChicagoIL60616 United States Indiana University BloomingtonIN47405 United States Institute of Computer Science The Czech Academy of Sciences Prague182 07 Czech Republic Institute for Nuclear Research of Russia Academy of Sciences 7a 60th October Anniversary prospect Moscow117312 Russia Institute of Physics The Czech Academy of Sciences Prague182 21 Czech Republic Department of Physics and Astronomy Iowa State University AmesIA50011 United States Department of Physics and Astronomy University of California at Irvine IrvineCA92697 United St

The NOvA long-baseline neutrino experiment uses a pair of large, segmented, liquid-scintillator calorimeters to study neutrino oscillations, using GeV-scale neutrinos from the Fermilab NuMI beam. These detectors are also sensitive to the flux of neutrinos which are emitted during a core-collapse supernova through inverse beta decay interactions on carbon at energies of O(10 MeV). This signature provides a means to study the dominant mode of energy release for a core-collapse supernova occurring in our galaxy. We describe the data-driven software trigger system developed and employed by the NOvA experiment to identify and record neutrino data from nearby galactic supernovae. This technique has been used by NOvA to self-trigger on potential core-collapse supernovae in our galaxy, with an estimated sensitivity reaching out to 10 kpc distance while achieving a detection efficiency of 23% to 49% for supernovae from progenitor stars with masses of 9.6 M to 27 M, respectively. Copyright © 2020, The Authors. All rights reserved.

关键词： Supernovae

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Effect of low Zn doping on the Verwey transition in magnetite single crystals: Mössbauer spectroscopy and x-ray diffraction

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Physical Review B 2018年第12期98卷 125138-125138页

作者： V. Chlan J. Żukrowski A. Bosak Z. Kąkol A. Kozłowski Z. Tarnawski R. Řezníček H. Štěpánková P. Novák I. Biało J. M. Honig Faculty of Mathematics and Physics Charles University V Holešovičkách 2 180 00 Prague 8 Czech Republic Academic Center of Materials and Nanotechnology AGH University of Science and Technology al. Mickiewicza 30 30-059 Kraków Poland European Synchrotron Radiation Facility 6 rue Jules Horowitz F-38043 Grenoble Cedex France Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 30-059 Kraków Poland Faculty of Physics and Earth Sciences University of Leipzig Linnéstrasse 5 D-04103 Leipzig Germany Institute of Physics of ASCR Cukrovarnická 10 162 53 Prague 6 Czech Republic Department of Chemistry Purdue University West Lafayette Indiana 47907-2084 USA

To observe, by microscopic probe, how low Zn doping in Fe3−xZnxO4 (x is below 1%) changes the Verwey transition, we have performed Mössbauer spectroscopy measurements on three single crystalline samples with various Zn doping. In spectra analysis we used the recently published model of Mössbauer data treatment formulated as a result of ab initio calculations for a low-temperature monoclinic structure (of Cc symmetry) of magnetite. It was suggested there that the hyperfine parameters for all 24 Fe distinct positions in the lattice can be grouped into four major components with very similar hyperfine parameters within each set. Using these parameters as starting values, very good fits were obtained for magnetite with low doping level, while for higher doping, x=0.03, where the Verwey transition changes its character, one component is significantly different. In particular, low hyperfine field Beff=36T, considered as a characteristic feature of the Cc phase spectrum, is absent here. Also, in this case, the high-temperature spectra are different from those for lower doped magnetite showing more pronounced continuous alteration with temperature. This might be due to crystal structure of lower than Fd-3m symmetry, a fact suggested by our x-ray synchrotron studies. All this triggered a discussion about an experimental fingerprint for the difference between these two classes of magnetite, frequently referred to as magnetite of first- and second-order Verwey transition, and about the electronic structure of both kinds of systems.

关键词： Crystal symmetry Magnetic interactions Metal-insulator transition Phase transitions Phase transitions by order Structural phase transition

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