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Dependence of plasmonic enhancement of photocurrent in a-Si: H on the position and thickness of SiNx spacer layers

Physica Status Solidi (C) Current Topics in Solid State physics 2015年第9-11期12卷 1220-1223页

作者： Saleh, Zaki M. Nasser, Hisham Özkol, Engin Bek, Alpan Turan, Raşit METU Ankara Turkey Department of Physics Arab American University-Jenin Jenin Palestine Department of Physics Middle East Technical University Ankara Turkey Micro and Nanotechnology Program of Graduate School of Natural and Applied Sciences METU Ankara Turkey

Plasmonic interfaces integrated to the front, back and both surfaces of photovoltaic thin films show different degrees of enhancement of light trapping. Enhancements in the spectral dependence of photocurrent normalized to the power of excitation light are used as an indicator of enhanced light trapping. In a previous study, we obtained enhancement in the spectral range of 600-700 nm by integrating 100-nm Ag nanoparticles to the back surface of a-Si:H with a critical dependence on the SiNx spacer layer thickness. In this study, we compare the enhancement in photocurrent due to plasmonic interfaces integrated to the front, back and both front and back surfaces of the a-Si:H absorber. Interfaces integrated to the back result in the largest enhancement in photocurrent while those integrated to the front give the lowest. The marginal enhancements due to two interfaces appear to be mainly due to the back interface. While plasmonics effects may not account for the total enhancement in photocurrent, it explains the relative enhancement in the spectral range of 550-700 rather well. For all configurations, the enhancement in the spectral dependence of photocurrent is accompanied by broadening into the red of the localized surface plasmon resonance (LSPR). © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Plasmonics

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Diagnosing hyperuniformity in two-dimensional, disordered, jammed packings of soft spheres

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Physical Review E 2015年第1期91卷 012302-012302页

作者： Remi Dreyfus Ye Xu Tim Still L. A. Hough A. G. Yodh Salvatore Torquato Complex Assemblies of Soft Matter CNRS-Rhodia-UPenn UMI 3254 Bristol Pennsylvania 19007-3624 USA Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104-6396 USA Department of Chemistry Department of Physics Princeton Institute for the Science and Technology of Materials and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

Hyperuniformity characterizes a state of matter for which (scaled) density fluctuations diminish towards zero at the largest length scales. However, the task of determining whether or not an image of an experimental system is hyperuniform is experimentally challenging due to finite-resolution, noise, and sample-size effects that influence characterization measurements. Here we explore these issues, employing video optical microscopy to study hyperuniformity phenomena in disordered two-dimensional jammed packings of soft spheres. Using a combination of experiment and simulation we characterize the possible adverse effects of particle polydispersity, image noise, and finite-size effects on the assignment of hyperuniformity, and we develop a methodology that permits improved diagnosis of hyperuniformity from real-space measurements. The key to this improvement is a simple packing reconstruction algorithm that incorporates particle polydispersity to minimize the free volume. In addition, simulations show that hyperuniformity in finite-sized samples can be ascertained more accurately in direct space than in reciprocal space. Finally, our experimental colloidal packings of soft polymeric spheres are shown to be effectively hyperuniform.

关键词： COLLOIDS FOURIER transforms SPECTRAL energy distribution MICROGELS MICROSCOPY

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Erratum to: A combined treatment of hydration and dynamical effects for the modeling of host-guest binding thermodynamics: the SAMPL5 blinded challenge

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Journal of computer-aided molecular design 2017年第1期31卷 45页

作者： Rajat Kumar Pal Kamran Haider Divya Kaur William Flynn Junchao Xia Ronald M Levy Tetiana Taran Lauren Wickstrom Tom Kurtzman Emilio Gallicchio Department of Chemistry Brooklyn College 2900 Bedford Avenue Brooklyn NY 11210 USA. Ph.D. Program in Biochemistry The Graduate Center of the City University of New York New York NY 10016 USA. Department of Chemistry Lehman College The City University of New York 250 Bedford Park Blvd. West Bronx New York NY 10468 USA. Ph.D. Program in Chemistry The Graduate Center of the City University of New York New York NY 10016 USA. Center for Biophysics and Computational Biology Institute of Computational Molecular Science and Department of Chemistry Temple University Philadelphia PA USA. Department of Physics and Astronomy Rutgers University Piscataway NJ 08854 USA. Borough of Manhattan Community College Department of Science The City University of New York 199 Chambers Street New York NY 10007 USA. Department of Chemistry Brooklyn College 2900 Bedford Avenue Brooklyn NY 11210 USA. egallicchio@brooklyn.cuny.edu. Ph.D. Program in Biochemistry The Graduate Center of the City University of New York New York NY 10016 USA. egallicchio@brooklyn.cuny.edu. Ph.D. Program in Chemistry The Graduate Center of the City University of New York New York NY 10016 USA. egallicchio@brooklyn.cuny.edu.

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Structure of Self-Assembled Mn Atom Chains on Si(001)

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Physical Review Letters 2015年第25期115卷 256104-256104页

作者： R. Villarreal M. Longobardi S. A. Köster Ch. J. Kirkham D. Bowler Ch. Renner Department of Quantum Matter Physics University of Geneva 24 Quai Ernest-Ansermet CH-1211 Geneva 4 Switzerland Division of Precision Science and Technology and Applied Physics Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan London Centre for Nanotechnology and Department of Physics and Astronomy University College London London WC1E 6BT United Kingdom

Mn has been found to self-assemble into atomic chains running perpendicular to the surface dimer reconstruction on Si(001). They differ from other atomic chains by a striking asymmetric appearance in filled state scanning tunneling microscopy (STM) images. This has prompted complicated structural models involving up to three Mn atoms per chain unit. Combining STM, atomic force microscopy, and density functional theory we find that a simple necklacelike chain of single Mn atoms reproduces all their prominent features, including their asymmetry not captured by current models. The upshot is a remarkably simpler structure for modeling the electronic and magnetic properties of Mn atom chains on Si(001).

关键词： Self-assembly Nanostructures Surface growth

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Inside Back Cover: Studies on the Magnetic Ground State of a Spin Möbius Strip (Chem. Eur. J. 40/2016)

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Chemistry - A European Journal 2016年第40期22卷 14407-14407页

作者： Newton, Graham N. Hoshino, Norihisa Matsumoto, Takuto Shiga, Takuya Nakano, Motohiro Nojiri, Hiroyuki Wernsdorfer, Wolfgang Furukawa, Yuji Oshio, Hiroki Graduate School of Pure and Applied Sciences University of Tsukuba Tennodai 1-1-1 Tsukuba305-8571 Japan School of Chemistry University of Nottingham NottinghamNG7 2RD United Kingdom Research Center for Structural Thermodynamics Graduate School of Science Osaka University Machikaneyama 1-1 OsakaToyonaka560-0043 Japan Institute of Materials Research Tohoku University Katahira 2-1-1 SendaiAoba-ku980-8577 Japan CNRS Institut NEEL Univ. Grenoble Alpes Grenoble38000 France Ames Laboratory and Department of Physics and Astronomy Iowa State University AmesIA50011 United States

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25th Annual Computational Neuroscience Meeting CNS-2016, Seogwipo City, South Korea, July 2-7, 2016 Abstracts

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BMC NEUROSCIENCE 2016年第1期17卷 1-112页

作者： [Anonymous] Computational Neurobiology Laboratory The Salk Institute for Biological Studies San Diego USA UNIC CNRS Gif sur Yvette France The European Institute for Theoretical Neuroscience (EITN) Paris France ATR Computational Neuroscience Laboratories Kyoto Japan Krembil Research Institute University Health Network Toronto Canada Department of Physiology University of Toronto Toronto Canada Department of Medicine (Neurology) University of Toronto Toronto Canada Department of Physics University of New Hampshire Durham USA Department of Neurophysiology Nencki Institute of Experimental Biology Warsaw Poland Department of Theory Wigner Research Centre for Physics of the Hungarian Academy of Sciences Budapest Hungary Department of Mathematical Sciences KAIST Daejoen Republic of Korea Department of Mathematics University of Houston Houston USA Department of Biochemistry & Cell Biology and Institute of Biosciences and Bioengineering Rice University Houston USA Department of Biology and Biochemistry University of Houston Houston USA Grupo de Neurocomputación Biológica Dpto. de Ingeniería Informática Escuela Politécnica Superior Universidad Autónoma de Madrid Madrid Spain Department of Biological Sciences University of Southern California Los Angeles USA Center for Neuroscience Korea Institute of Science and Technology Seoul South Korea Department of Neurology Albert Einstein College of Medicine Bronx USA Center for Neuroscience KIST Seoul South Korea Department of Neuroscience University of Science and Technology Daejon South Korea Systems Neuroscience Group QIMR Berghofer Medical Research Institute Herston Australia Department of Psychology Yonsei University Seoul South Korea Department of Psychiatry Kyung Hee University Hospital at Gangdong Seoul South Korea Department of Psychiatry Veterans Administration Boston Healthcare System and Harvard Medical School Brockton USA Department of Electrical and Electronic Engineering The University of Melbourne Parkvil

A1 Functional advantages of cell-type heterogeneity in neural circuits Tatyana O. Sharpee A2 Mesoscopic modeling of propagating waves in visual cortex Alain Destexhe A3 Dynamics and biomarkers of mental disorders Mitsuo Kawato F1 Precise recruitment of spiking output at theta frequencies requires dendritic h-channels in multi-compartment models of oriens-lacunosum/moleculare hippocampal interneurons Vladislav Sekulić, Frances K. Skinner F2 Kernel methods in reconstruction of current sources from extracellular potentials for single cells and the whole brains Daniel K. Wójcik, Chaitanya Chintaluri, Dorottya Cserpán, Zoltán Somogyvári F3 The synchronized periods depend on intracellular transcriptional repression mechanisms in circadian clocks. Jae Kyoung Kim, Zachary P. Kilpatrick, Matthew R. Bennett, Kresimir Josić O1 Assessing irregularity and coordination of spiking-bursting rhythms in central pattern generators Irene Elices, David Arroyo, Rafael Levi, Francisco B. Rodriguez, Pablo Varona O2 Regulation of top-down processing by cortically-projecting parvalbumin positive neurons in basal forebrain Eunjin Hwang, Bowon Kim, Hio-Been Han, Tae Kim, James T. McKenna, Ritchie E. Brown, Robert W. McCarley, Jee Hyun Choi O3 Modeling auditory stream segregation, build-up and bistability James Rankin, Pamela Osborn Popp, John Rinzel O4 Strong competition between tonotopic neural ensembles explains pitch-related dynamics of auditory cortex evoked fields Alejandro Tabas, André Rupp, Emili Balaguer-Ballester O5 A simple model of retinal response to multi-electrode stimulation Matias I. Maturana, David B. Grayden, Shaun L. Cloherty, Tatiana Kameneva, Michael R. Ibbotson, Hamish Meffin O6 Noise correlations in V4 area correlate with behavioral performance in visual discrimination task Veronika Koren, Timm Lochmann, Valentin Dragoi, Klaus Obermayer O7 Input-location dependent gain modulation in cerebellar nucleus neurons Maria Psarrou, Maria Schilstra, Neil Davey, Benjamin Torben-Ni

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Author Correction: Discovery of stimulation-responsive immune enhancers with CRISPR activation

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Nature 2018年第7715期559卷 E13页

作者： Dimitre R Simeonov Benjamin G Gowen Mandy Boontanrart Theodore L Roth John D Gagnon Maxwell R Mumbach Ansuman T Satpathy Youjin Lee Nicolas L Bray Alice Y Chan Dmytro S Lituiev Michelle L Nguyen Rachel E Gate Meena Subramaniam Zhongmei Li Jonathan M Woo Therese Mitros Graham J Ray Gemma L Curie Nicki Naddaf Julia S Chu Hong Ma Eric Boyer Frederic Van Gool Hailiang Huang Ruize Liu Victoria R Tobin Kathrin Schumann Mark J Daly Kyle K Farh K Mark Ansel Chun J Ye William J Greenleaf Mark S Anderson Jeffrey A Bluestone Howard Y Chang Jacob E Corn Alexander Marson Biomedical Sciences Graduate Program University of California San Francisco California 94143 USA. Department of Microbiology and Immunology University of California San Francisco California 94143 USA. Diabetes Center University of California San Francisco California 94143 USA. Innovative Genomics Institute University of California Berkeley California 94720 USA. Department of Molecular and Cell Biology University of California Berkeley Berkeley California 94720 USA. Sandler Asthma Basic Research Center University of California San Francisco California 94143 USA. Center for Personal Dynamic Regulomes Stanford University School of Medicine Stanford California 94305 USA. Program in Epithelial Biology Stanford University School of Medicine Stanford California 94305 USA. Department of Genetics Stanford University School of Medicine Stanford California 94305 USA. Department of Pediatrics University of California San Francisco California 94143 USA. Department of Epidemiology and Biostatistics Department of Bioengineering and Therapeutic Sciences Institute for Human Genetics (IHG) University of California San Francisco California 94143 USA. Biological and Medical Informatics Graduate Program University of California San Francisco California 94158 USA. Broad Institute of MIT and Harvard Cambridge Massachusetts 02142 USA. Analytic and Translational Genetics Unit Massachusetts General Hospital Harvard Medical School Boston Massachusetts 02114 USA. Illumina Inc. 5200 Illumina Way San Diego California 92122 USA. Department of Applied Physics Stanford University Stanford California 94025 USA. Chan Zuckerberg Biohub San Francisco California 94158 USA. Department of Medicine University of California San Francisco California 94143 USA. Innovative Genomics Institute University of California Berkeley California 94720 USA. jcorn@berkeley.edu. Department of Molecular and Cell Biology University of California Berkeley Berkeley Californi

In this Letter, analysis of steady-state regulatory T (Treg) cell percentages from Il2ra enhancer deletion (EDEL) and wild-type (WT) mice revealed no differences between them (Extended Data Fig. 9d). This analysis included two mice whose genotypes were incorrectly assigned. Even after correction of the genotypes, no significant differences in Treg cell percentages were seen when data across experimental cohorts were averaged (as was done in Extended Data Fig. 9d). However, if we normalize the corrected data to account for variation among experimental cohorts, a subtle decrease in EDEL Treg cell percentages is revealed and, using the corrected and normalized data, we have redrawn Extended Data Fig. 9d in Supplementary Fig. 1. The Supplementary Information to this Amendment contains the corrected and reanalysed Extended Data Fig. 9d. The sentence "This enhancer deletion (EDEL) strain also had no obvious T cell phenotypes at steady state (Extended Data Fig. 9)." should read: "This enhancer deletion (EDEL) strain had a small decrease in the percentage of Treg cells (Extended Data Fig. 9).". This error does not affect any of the main figures in the Letter or the data from mice with the human autoimmune-associated single nucleotide polymorphism (SNP) knocked in or with a 12-base-pair deletion at the site (12DEL). In addition, we stated in the Methods that we observed consistent immunophenotypes of EDEL mice across three founders, but in fact, we observed consistent phenotypes in mice from two founders. This does not change any of our conclusions and the original Letter has not been corrected.

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Modeling the formation and dynamics of cortical waves induced by cholinergic modulation

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BMC Neuroscience 2015年第1期16卷 1-2页

作者： James P Roach Michal R Zochowski Eshel Ben-Jacob Leonard M Sander Neuroscience Graduate Program University of Michigan Ann Arbor MI 48109 U.S.A Department of Physics & Center for Studies of Complex Systems University of Michigan Ann Arbor MI 48109 USA Biophysics Program University of Michigan Ann Arbor MI 48109 USA School of Physics and Astronomy Tel-Aviv University Tel Aviv 69978 Israel Center for Theoretical Biological Physics and Department of Biochemistry and Cell Biology Rice University Houston TX 77005 USA

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Centrality-Dependent Modification of Jet-Production Rates in Deuteron-Gold Collisions at sNN=200 GeV

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Physical Review Letters 2016年第12期116卷 122301-122301页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander M. Alfred A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay N. S. Bandara B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov J. H. Bhom D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell A. Caringi C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole Z. Conesa del Valle M. Connors M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev T. W. Danley K. Das A. Datta M. S. Daugherity G. David M. K. Dayananda K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch A. Dion P. B. Diss J. H. Do M. Donadelli L. D’Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu C. Gal P. Gallus P. Garg I. Garishvili H. Ge F. Giordano A. Glenn H. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene G. Grim M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya Y. Ikeda K. Imai M. Inaba A. Iordanova D. Isenhower M. Ishihara M. Issah D. Ivanishchev Y. Iwanaga B. V. Jacak M. Jezghani J. Jia X. Jiang J. Jin B. M. Johnson T. Jones K. S. Joo D. Jouan D. S. Jumper University of Colorado Boulder Colorado 80309 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington DC 20059 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Kyoto University Kyoto 606-8502 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University o

Jet production rates are measured in p+p and d+Au collisions at sNN=200 GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider. Jets are reconstructed using the R=0.3 anti-kt algorithm from energy deposits in the electromagnetic calorimeter and charged tracks in multiwire proportional chambers, and the jet transverse momentum (pT) spectra are corrected for the detector response. Spectra are reported for jets with 12

关键词： Jets & heavy flavor physics Quark-gluon plasma Relativistic heavy-ion collisions

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Single electron yields from semileptonic charm and bottom hadron decays in Au+Au collisions at sNN=200 GeV

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Physical Review C 2016年第3期93卷 034904-034904页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai N. S. Bandara B. Bannier K. N. Barish B. Bassalleck S. Bathe V. Baublis S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors N. Cronin N. Crossette M. Csanád T. Csörgő S. Dairaku T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond O. Dietzsch L. Ding A. Dion P. B. Diss J. H. Do M. Donadelli L. D'Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum S. Edwards Y. V. Efremenko T. Engelmore A. Enokizono S. Esumi K. O. Eyser B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano S. Hayashi X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Horaguchi T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara H. Iinuma Y. Ikeda K. Imai Y. Imazu J. Imrek M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak M. Javani M. Jezghani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu D. Kawall A. V. Kazantsev T. Kempel J. A. Key V. Khachatryan P. K. Khandai A. Khanzadeev K. M. Kijima B. I. Kim C. Kim D. J. Kim E.-J. Kim G. W. Kim M. Kim Y.-J. Kim Y. K. Kim University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Kyoto University Kyoto 606-8502 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia National Research Center “Kurchatov Institute ” Moscow 123098 Russia New Mexico State University Las Cruces New Mexico 88003 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 U

The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open heavy flavor production in minimum bias Au+Au collisions at sNN=200 GeV via the yields of electrons from semileptonic decays of charm and bottom hadrons. Previous heavy flavor electron measurements indicated substantial modification in the momentum distribution of the parent heavy quarks owing to the quark-gluon plasma created in these collisions. For the first time, using the PHENIX silicon vertex detector to measure precision displaced tracking, the relative contributions from charm and bottom hadrons to these electrons as a function of transverse momentum are measured in Au+Au collisions. We compare the fraction of electrons from bottom hadrons to previously published results extracted from electron-hadron correlations in p+p collisions at sNN=200 GeV and find the fractions to be similar within the large uncertainties on both measurements for pT>4GeV/c. We use the bottom electron fractions in Au+Au and p+p along with the previously measured heavy flavor electron RAA to calculate the RAA for electrons from charm and bottom hadron decays separately. We find that electrons from bottom hadron decays are less suppressed than those from charm for the region 3

关键词： Particle & resonance production Photon, lepton & quark production Relativistic heavy-ion collisions

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