检索结果-南通市图书馆

Characterisation of Photocathodes Based on Pb Thin Film deposited by UV Pulsed Laser Ablation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第1期30卷 37-40页

作者： Francisco Gontad Antonella Lorusso Giancarlo Gatti Massimo Ferrario Laura Gioia Passione Luana Persano Nicola Lovergine Alessio Perrone Istituto Nazionale di fisica Nucleare e Università del Salento Università del Salento Dipartimento di Matematica e Fisica "E.De Giorgi" Laboratori Nazionali di Frascati Istituto Nazionale di Fisica Nucleare Center for Biomolecular Nanotechnologies Istituto Italiano di Tecnologia dipartimento di Ingegneria dell'Innovazione Università del Salento National Nanotechnology Laboratory(NNL)

This work deals with the deposition of lead （Pb） thin films by the UV pulsed laser ablation technique, for their further use as photocathode devices in superconducting radio frequency guns. Scanning electron microscopy and atomic force microscopy analyses were performed to study the morphological features of Pb thin films deposited on Si （100） and Nb substrates. The films showed a granular structure with a nearly fully covered surface only for that one deposited on Nb substrate. X-ray diffraction measurements indicate the growth of polycrystalline Pb thin films with a preferential orientation along （111） planes. Results of the photoemission performance of Pb thin film deposited on Nb substrate showed a very encouraging average value of quantum efficiency of 6 x 10-5 through a single-photon absorption process, promoting further studies in the realisation of Pb photocathodes by this technique.

关键词： Pulsed laser deposition Lead thin film Metallic photocathodes Quantum efficiency

entropy and Cosmological Constant of a Universe Calculated by Means of dimensional Analysis, Margolus-Levitin Theorem and Landauer’s Principle

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2023年第10期14卷 1310-1322页

作者： Mario Leo dipartimento di matematica e fisica ‘‘ennio de giorgi’’ Università del Salento Lecce Italy

By means of the dimensional analysis a spherically simmetric universe with a mass M = c3/(2HG) and radius equal to c/H is considered, where H is the Hubble constant, c the speed of light and G the Newton gravitational constant. The density corresponding to this mass is equal to the critical density ρcr = 3H2/(8πG). This universe evolves according to a Bondi-Gold-Hoyle scenario, with continuous creation of matter at a rate such to maintain, during the expansion, the density always critical density. Using the Margolus-Levitin theorem and the Landauer’s principle, an entropy is associated with this universe, obtaining a formula having the same structure as the Bekenstein-Hawking formula of the entropy of a black hole. Furthermore, a time-dependent cosmological constant Λ, function of the Hubble constant and the speed of light, is proposed.

关键词： Cosmological Models Cosmological Constant entropy

energy spectrum of cosmic protons and helium nuclei by a hybrid measurement at 4300 m a.s.l.

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2014年第4期38卷 25-31页

作者： B.Bartoli P.Bernardini 毕效军 I.Bolognino P.Branchini A.Budano A.K.Calabrese Melcarne P.Camarri 曹臻 R.Cardarelli S.Catalanotti 陈松战陈天禄 P.Creti 崔树旺戴木忠 A.D'Amone 单增罗布 I.de Mitri B.D'ettorre Piazzoli T.di Girolamo G.di Sciascio 冯存峰冯朝阳冯振勇苟全补郭义庆何会海胡海兵胡红波 M.Iacovacci R.Iuppa 贾焕玉拉巴次仁厉海金 G.Liguori 刘成刘俊刘茂元卢红马玲玲马欣华 G.Mancarella S.M.Mari G.Marsella D.Martello S.Mastroianni P.Montini C.C.Ning M.Panareo B.Panico L.Perrone P.Pistilli F.Ruggieri P.Salvini R.Santonico S.N.Sbano 沈培若盛向东石峰 A.Surdo 谭有恒 P.Vallania S.Vernetto C.Vigorito 王辉吴超勇吴含荣薛良杨群羽杨先楚姚志国袁爱芳查敏张慧敏张力张学尧张勇赵静扎西次仁扎西桑珠周勋秀祝凤荣朱清棋 G.Zizzi 白云翔陈明君陈垚冯少辉高博顾旻皓侯超李晓晓刘佳刘加丽王旭肖刚张丙开张寿山周斌左雄 dipartimento di fisica dell’Università di Napoli "Federico II" Complesso Universitario di Monte Sant’Angelovia Cinthia Istituto Nazionale di fisica Nucleare Sezione di Napoli Complesso Universitario di Monte Sant’Angelovia Cinthia dipartimento di matematica e fisica "ennio de giorgi" Università del Salento via per Arnesano Istituto Nazionale di fisica Nucleare Sezione di Lecce via per Arnesano Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences dipartimento di fisica dell’Università di Pavia via Bassi 627100 Pavia Italy Istituto Nazionale di fisica Nucleare Sezione di Pavia via Bassi 627100 Pavia Italy Istituto Nazionale di fisica Nucleare Sezione di Roma Tre via della Vasca Navale 8400146 Roma Italy Istituto Nazionale di fisica Nucleare-CNAF Viale Berti-Pichat 6/240127 Bologna Italy dipartimento di fisica dell’Università di Roma "Tor Vergata" via della Ricerca Scientifica Istituto Nazionale di fisica Nucleare Sezione di Roma Tor Vergata via della Ricerca Scientifica Tibet University Hebei Normal University Yunnan University Shandong University Southwest Jiaotong University dipartimento di fisica dell’Università "Roma Tre" via della Vasca Navale 8400146 Roma Italy Osservatorio Astrofisico di Torino dell’Istituto Nazionale di Astrofisica via P.Giuria 110125 Torino Italy Istituto Nazionale di fisica Nucleare Sezione di Torino via P.Giuria 110125 Torino Italy dipartimento di fisica dell’Università di Torino via P.Giuria 110125 Torino Italy Physics department Kunming University Normal College of Fuyang

The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.

关键词： Cherenkov telescope ARGO-YBJ energy spectrum hybrid measurement composition

Calibration of the DAMPe Plastic Scintillator detector and its on-orbit performance

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第3期19卷 145-154页

作者： Meng ding Ya-Peng Zhang Yong-Jie Zhang Yuan-Peng Wang Tie-Kuang Dong Antonio de Benedittis Paolo Bernardini Fang Fang Yao Li Jie Liu Peng-Xiong Ma Zhi-Yu Sun Valentina Gallo Stefania Vitillo Zhao-Min Wang Yu-Hong Yu Chuan Yue Qiang Yuan Yong Zhou Yun-Long Zhang Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences School of Astronomy and Space Science University of Science and Technology of China Istituto Nazionale di fisica Nucleare (INFN) - Sezione di Lecce dipartimento di matematica e fisica e.de giorgi Universit`a del Salento department of Nuclear and Particle Physics University of Geneva Gran Sasso Science Institute INFN Laboratori Nazionali del Gran Sasso department of Modern Physics University of Science and Technology of China

The DArk Matter Particle explorer(DAMPe) is a space-borne apparatus for detecting the highenergy cosmic-ray-like electrons, γ-rays, protons and heavy ions. The Plastic Scintillator detector(PSD)is the top-most sub-detector of the DAMPe. The PSD is designed to measure the charge of incident highenergy particles and it also serves as a veto detector for discriminating γ-rays from charged particles. In this paper, a PSD on-orbit calibration procedure is described, which includes the five steps of pedestal, dynode correlation, response to minimum-ionizing particles, light attenuation function and energy reconstruction.A method for reconstructing the charge of incident high energy cosmic-ray particles is introduced. The detection efficiency of each PSD strip is verified to be above 99.5%; the total efficiency of the PSD for charged particles is above 99.99%.

关键词： cosmic ray instrumentation: DAMPe charge measurement plastic scintillator detector calibration

Comparison of Proton Shower developments in the BGO Calorimeter of the Dark Matter Particle explorer between GeANT4 and FLUKA Simulations

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2020年第11期37卷 114-120页

作者： Wei Jiang Chuan Yue Ming-Yang Cui Xiang Li Qiang Yuan Francesca Alemanno Paolo Bernardini Giovanni Catanzani Zhan-Fang Chen Ivan de Mitri Tie-Kuang Dong Giacinto Donvito David Francois Droz Piergiorgio Fusco Fabio Gargano Dong-Ya Guo dimitrios Kyratzis Shi-Jun Lei Yang Liu Francesco Loparco Peng-Xiong Ma Giovanni Marsella Mario Nicola Mazziotta Xu Pan Wen-Xi Peng Antonio Surdo Andrii Tykhonov Yi-Yeng Wei Yu-Hong Yu Jing-Jing Zang Ya-Peng Zhang Yong-Jie Zhang Yun-Long Zhang Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Gran Sasso Science Institute(GSSI) Viale F.Crispi 7I-67100L'AquilaItaly Istituto Nazionale di fisica Nucleare Laboratori Nazionali del Gran SassoVia G.Acitelli 22I-67100AssergiL'AquilaItaly dipartimento di matematica e fisica e.de giorgi Universitàdel SalentoI-73100 LecceItaly Istituto Nazionale di fisica Nucleare(INFN)-Sezione di Lecce I-73100 LecceItaly INFN Section of Perugia I-06100 PerugiaItaly University of Perugia I-06100 PerugiaItaly Istituto Nazionale di fisica Nucleare(INFN)-Sezione di Bari I-70125BariItaly department of Nuclear and Particle Physics University of GenevaCH-1211Switzerland dipartimento Interateneo“M.Merlin”dell'Universitàdegli Studi di Bari e del Politecnico di Bari I-70125BariItaly dipartimento di fisica e Chimica“e.Segrè” via delle Scienze Edificio 17UniversitàDegli Studi di PalermoI-90128PalermoItaly Institute of High energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle detection and electronics University of Science and Technology of ChinaHefei 230026China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The DArk Matter Particle explorer(DAMPe)is a satellite-borne detector for high-energy cosmic rays and *** fully understand the detector performance and obtain reliable physical results,extensive simulations of the detector are *** simulations are particularly important for the data analysis of cosmic ray nuclei,which relies closely on the hadronic and nuclear interactions of particles in the detector *** adopted simulation softwares include the GeANT4 and FLUKA,both of which have been implemented for the DAMPe simulation *** we describe the simulation tool of DAMPe and compare the results of proton shower properties in the calorimeter from the two simulation *** a comparison gives an estimate of the most significant uncertainties of our proton spectral analysis.

关键词： material. GeANT4 calorimeter

Quantum hydrodynamics of a single particle

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 1199-1205页

作者： Daniel Gustavo Suarez-Forero Vincenzo Ardizzone Saimon Filipe Covre da Silva Marcus Reindl Antonio Fieramosca Laura Polimeno Milena de giorgi Lorenzo Dominici Loren N.Pfeiffer Giuseppe Gigli Dario Ballarini Fabrice Laussy Armando Rastelli Daniele Sanvitto CNR NANOTeC Institute of NanotechnologyCampus EcotekneVia Monteroni73100 LecceItaly dipartimento di Ingegneria dell’Innovazione Universita del SalentoCampus Ecoteknevia Monteroni73100 LecceItaly Institute of Semiconductor and Solid State Physics Johannes Kepler UniversityAltenbergerstr.69Linz 4040Austria dipartimento di matematica e fisica e.de giorgi Universita del SalentoCampus Ecoteknevia MonteroniLecce 73100Italy PRISM Princeton Institute for the Science and Technology of MaterialsPrinceton UniversityPrincetonNJ 08540USA Faculty of Science and engineering University of WolverhamptonWulfruna StreetWolverhampton WV11LYUK Russian Quantum Center Novaya 100143025 SkolkovoMoscow RegionRussia

Semiconductor devices are strong competitors in the race for the development of quantum computational *** this work,we interface two semiconductor building blocks of different dimensionalities with complementary properties:(1)a quantum dot hosting a single exciton and acting as a nearly ideal single-photon emitter and(2)a quantum well in a 2D microcavity sustaining polaritons,which are known for their strong interactions and unique hydrodynamic properties,including ultrafast real-time monitoring of their propagation and phase *** the present experiment,we can thus observe how the injected single particles propagate and evolve inside the microcavity,giving rise to hydrodynamic features typical of macroscopic systems despite their genuine intrinsic quantum *** the presence of a structural defect,we observe the celebrated quantum interference of a single particle that produces fringes reminiscent of wave *** this behavior could be theoretically expected,our imaging of such an interference pattern,together with a measurement of antibunching,constitutes the first demonstration of spatial mapping of the self-interference of a single quantum particle impinging on an obstacle.

关键词： quantum particle hydrodynamic