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The HEPD particle detector of the CSES satellite mission for investigating seismo-associated perturbations of the Van Allen belts

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Science China(Technological Sciences) 2018年第5期61卷 643-652页

作者： AMBROSI Giovanni BARTOCCI Simona BASARA Laurent BATTISTOn Roberto BURGER William J. CARfORA Luca CASTELLInI Guido CIPOLLOnE Piero COnTI Livio COnTIn Andrea DE DOnATO Cinzia DE SAnTIS Cristian fOLLEGA francesco M. GUAnDALInI Cristina IOnICA Maria IUPPA Roberto LAUREnTI Giuliano LAZZIZZERA Ignazio LOLLI Mauro MAnEA Christian MARCELLI Laura MASCIAnTOnIO Giuseppe MERGE Matteo OSTERIA Giuseppe PACInI Lorenzo PALMA francesco PALMOnARI federico PAnICO Beatrice PATRIZII Laura PERfETTO francesco PICOZZA Piergiorgio POZZATO Michele PUEL Matteo RASHEVSKAYA Irina RICCI Ester RICCI Marco RICCIARInI Sergio Bruno SCOTTI Valentina SOTGIU Alessando SPARVOLI Roberta SPATARO Bruno VITALE Vincenzo Istituto nazionale di fisica nucleare (Infn) Sezione di Perugia Perugia 06123 Italy Uninettuno University Rome 00186 Italy Istituto nazionale di fisica nucleare (Infn) Sezione di Roma Tor Vergata Rome 00133 Italy Istituto nazionale di fisica nucleare (Infn) TIFPA Povo (TN) 38123 Italy dipartimento di fisica Universita di Trento Povo (TN) 38123 Italy dipartimento di fisica Universita di Roma Tor Vergata Rome 00133 Italy IfAC-CnR Sesto Fiorentino (FI) 50019 Italy dipartimento di fisica e Astronomia Universita di Bologna Bologna 40127 Italy Istituto nazionale di fisica nucleare (Infn) Sezione di Bologna Bologna 40127 Italy Istituto nazionale di fisica nucleare (Infn) Sezione di Napoli Naples 80126 Italy Istituto nazionale di fisica nucleare (Infn) LNE Frascati (RM) 00044 Italy Agenzia Spaziale Italiana (ASI) SSDC Rome 00133 Italy

CSES(China Seismo-Electromagnetic Satellite) is a mission developed by CnSA(Chinese national Space Administration) and ASI(Italian Space Agency), to investigate the near-Earth electromagnetic, plasma and particle environment, for studying the seismo-associated disturbances in the ionosphere-magnetosphere transition zone. The anthropogenic and electromagnetic noise,as well as the natural non-seismic electromagnetic emissions is mainly due to tropospheric activity. In particular, the mission aims to confirming the existence of possible temporal correlations between the occurrence of earthquakes for medium and strong magnitude and the observation in space of electromagnetic perturbations, plasma variations and precipitation of bursts with highenergy charged particles from the inner Van Allen belt. In this framework, the high energy particle detector(HEPD) of the CSES mission has been developed by the Italian LIMADOU Collaboration. HEPD is an advanced detector based on a tower of scintillators and a silicon tracker that provides good energy and angular resolution and a wide angular acceptance, for electrons of 3–100 Me V, protons of 30–200 Me V and light nuclei up to the oxygen. CSES satellite has been launched on february 2^(nd), 2018 from the Jiuquan Satellite Launch Center(China).

关键词： earthquake seismic-precursors particle detector Van Allen belts magnetosphere ionosphere space weather cosmic rays

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

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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

Testing noncommutative spacetimes and violations of the Pauli Exclusion Principle through underground experiments

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Chinese Physics C 2018年第9期42卷 79-86页

作者： Andrea Addazi Pierluigi Belli Rita Bernabei Antonino Marcianò Center for field Theory and Particle Physics & Department of Physics Fudan University 200433 Shanghai China Infn sezione roma "Tor Vergata" I-00133 Rome Italy EU dipartimento di fisica Universita di Roma "Tor Vergata" I-00133 Rome Italy EU

We propose to deploy limits that arise from different tests of the Pauli Exclusion Principle： i） to provide theories of quantum gravity with experimental guidance; ii） to distinguish, among the plethora of possible models, the ones that are already ruled out by current data; iii） to direct future attempts to be in accordance with experimental constraints. We first review experimental bounds on nuclear processes forbidden by the Pauli Exclusion Principle,which have been derived by several experimental collaborations making use of various detector materials. distinct features of the experimental devices entail sensitivities on the constraints hitherto achieved that may differ from one another by several orders of magnitude. We show that with choices of these limits, well-known examples of flat noncommutative space-time instantiations of quantum gravity can be heavily constrained, and eventually ruled *** devote particular attention to the analysis of the κ-Minkowski and θ-Minkowski noncommutative *** are deeply connected to some scenarios in string theory, loop quantum gravity, and noncommutative *** emphasize that the severe constraints on these quantum spacetimes, although they cannot rule out theories of top-down quantum gravity to which they are connected in various ways, provide a powerful limitation for those models. focus on this will be necessary in the future.

关键词： non-commutative space-times tests of violations of the Pauli Exclusion Principle theta-Minkowski kappa-Minkowski

A classification of induced seismicity

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Geoscience frontiers 2018年第6期9卷 1903-1909页

作者： C.Doglioni dipartimento Scienze della Terra UniversitàSapienza di RomaItaly Istituto nazionale di Geofisica e Vulcanologia RomaItaly

In order to adopt the best safety procedures, man-made earthquakes should be differentiated as a function of their origin. At least four different types of settings can be recognized in which anthropogenic activities may generate seismicity:(I) fluid removal from a stratigraphic reservoir in the underground can trigger the compaction of the voids and the collapse of the overlying volume, i.e., graviquakes; the deeper the reservoir, the bigger the volume and the earthquake magnitude;(II) wastewater or gas reinjection provides the reduction of friction in volumes and along fault planes, allowing creep or sudden activation of tectonic discontinuities, i.e., reinjection quakes;(iii) fluid injection at supra-lithostatic pressure generates hydrofracturing and micro-seismicity, i.e., hydrofracturing quakes;(IV) fluid extraction or fluid injection,filling or unfilling of artificial lakes modifies the lithostatic load, which is the maximum principal stress in extensional tectonic settings, the minimum principal stress in contractional tectonic settings, and the intermediate principal stress in strike-slip settings, i.e., load quakes; over given pressure values, the increase of the lithostatic load may favour the activation of normal faults, whereas its decrease may favour thrust faults. for example, the filling of an artificial lake may generate normal fault-related ***, each setting has its peculiarities and the knowledge of the different mechanisms may contribute to the adoption of the appropriate precautions in the various industrial activities.

关键词： Anthropogenic seismicity Graviquakes Reinjection quakes Hydrofracturing quakes Load quakes

new Exceptional Sets and Convergence of the Square Partial Sums of Walsh–fourier Series

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Acta Mathematica Sinica,English Series 2020年第7期36卷 733-748页

作者： Elena PRESTInI dipartimento di Matematica Universitàdi Roma"Tor Vergata"Via della Ricerca Scientifica 100133 RomaItalia

for double Walsh–fourier series and with f∈L2([0,1)×[0,1))we prove two almost orthogonality results relative to the linearized maximal square partial sums operator Sn(x,y)f(x,y).Assumptions are n(x,y)non-decreasing as a function of x and of y and,roughly speaking,partial derivatives with approximately constant ratio■≌2n0 for all x and y,where n0 is any fixed non-negative ***,independent of n(x,y)and n0,are then extended to Lr,1n application to the family n(x,y)=λxy on[0,1)×[0,1),anyλ>10.

关键词： Walsh integer Convergence

Latest results from GRAAL collaboration

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Chinese Physics C 2009年第12期33卷 1249-1253页

作者： V. Vegna V. Bellini J.P. Bouquet L. Casano A. D'Angelo J.P. didelez R. di Salvo A. fantini D. franco G. Gervino f. Ghio G. Giardina B. Girolami A. Giusa M. Guidal E. Hourany A.S. Ignatov R. Kunnel A. Lapik A. Lleres P. Levi Sandri f. Mammoliti G. Mandaglio M. Manganaro M. Moricciani A.n. Mushkarenkov V.G. nedorezov C. Randieri D. Rebreyend n.V. Rudnev G. Russo C. Schaerf M.L. Sperduto M.C. Sutera A.Turinge dip. di fisica Università degli Studi di Roma 'Tor Vergata' via della Ricerca Scientifica 1 I-00133 Roma Italy Infn - sezione di roma 'Tor Vergata' via della Ricerca Scientifica 1 I-00133 Roma Italy dip. di fisica e Astronomia Università di Catania via Santa Sofia 44 I-95123 Catania Italy Infn - sezione di Catania via Santa Sofia 44 I-95123 Catania Italy LPSC Universit Joseph Fourier Grenoble 1 CNRS/IN2P3 Institut National Polytechnique de Grenoble 53 Avenue des Martyres 38026 Grenoble France IPnO Universit de Paris-Sud 11 CNRS/IN2P3 15 rue Georges Clemenceau 91406 Orsay France dip. di fisica Sperimentale Università di Torino via P.Giuria I-00125 Torino Italy Infn - sezione di Torino via P.Giuria I-00125 Torino Italy Istituto Superiore di Sanità viale Regina Elena 299 I-00161 Roma Italy Infn - sezione di roma piazzale Aldo Moro 2 I-00185 Roma Italy dip. di fisica Universitàdi Messina salita Sperone 31 I-98166 Messina Italy Institute for nuclear Research RAS 117312 Moscow Russia Infn - Laboratori nazionali di frascati via E.Fermi 40 I-00044 Frascati Italy Infn - sezione di Catania via Santa Sofia 44 I-95123 Catania Italy

The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of 1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduCtion on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the ∑ beam asymmetries in η and π0 photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K＋A photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.

关键词： polarized photon meson photoproduction polarization observables

Shifts in the BCfW method for QED

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Chinese Physics C 2022年第9期46卷 142-158页

作者： Ke Li Yuxin Liu Qi-Shu Yan Xiaoran Zhao School of Physics Sciences University of Chinese Academy of SciencesBeijing 100049China Center for future high energy physics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China dipartimento di Matematica e fisica Universitàdi Roma Tre and INFNsezione di Roma TreVia della Vasca Navale 84Rome I-00146Italy

We study the application of BCfW recursion relations to the QED process 0→e^(-)e^(+)nγ.Based on 6-point amplitudes(both MHVA and nMHVA)computed from feynman diagrams in the Berends-Giele gauge,we conduct a comprehensive study on different ***,we propose a new shift(LLYZ shift),which can lead to the full amplitudes of these processes and have several realistic computational *** compare the number of terms and independent amplitudes of this novel shift with those of a few typical shifts.

关键词： QED BCfW method helicity amplitudes

Unveiling the geometric meaning of quantum entanglement:discrete and continuous variable systems

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frontiers of physics 2024年第5期19卷 193-206页

作者： Arthur Vesperini Ghofrane Bel-Hadj-Aissa Lorenzo Capra Roberto franzosi DSfTA University of SienaVia Roma 5653100 SienaItaly QSTAR&CnR-Istituto nazionale di Ottica Largo Enrico Fermi 2I-50125 FirenzeItaly Infn sezione di Perugia I-06123 PerugiaItaly

We show that the manifold of quantum states is endowed with a rich and nontrivial geometric *** derive the fubini−Study metric of the projective Hilbert space of a multi-qubit quantum system,endowing it with a Riemannian metric structure,and investigate its deep link with the entanglement of the states of this *** a measure,we adopt the entanglement distance E preliminary proposed in ***.A 101,042129(2020).Our analysis shows that entanglement has a geometric interpretation:E(|ψ>)is the minimum value of the sum of the squared distances between|ψ>and its conjugate states,namely the statesυ^(μ).σ^(μ)|ψ>,whereυ^(μ)are unit vectors andμruns on the number of *** the proposed geometric approach,we derive a general method to determine when two states are not the same state up to the action of local unitary ***,we prove that the entanglement distance,along with its convex roof expansion to mixed states,fulfils the three conditions required for an entanglement measure,that is:i)E(|ψ>)=0 iff|ψ>is fully separable;ii)E is invariant under local unitary transformations;iii)E does not increase under local operation and classical *** different proofs are provided for this latter *** also show that in the case of two qubits pure states,the entanglement distance for a state|ψ>coincides with two times the square of the concurrence of this *** propose a generalization of the entanglement distance to continuous variable ***,we apply the proposed geometric approach to the study of the entanglement magnitude and the equivalence classes properties,of three families of states linked to the Greenberger−Horne−Zeilinger states,the Briegel Raussendorf states and the W *** an example of application for the case of a system with continuous variables,we have considered a system of two coupled Glauber coherent states.

关键词： entanglements quantum information entanglement measure

first-principles search of hot superconductivity in La-X-H ternary hydrides

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npj Computational Materials 2022年第1期8卷 1-8页

作者： Simone di Cataldo Wolfgang von der Linden Lilia Boeri Institute of Theoretical and Computational Physics Graz University of TechnologyNAWI Graz8010GrazAustria dipartimento di fisica Sapienza Universitàdi Roma00185RomaItaly Centro Ricerche Enrico fermi Via Panisperna89a00184RomaItaly

Motivated by the recent claim of hot superconductivity with critical temperatures up to 550 K in La + x hydrides,we investigate the high-pressure phase diagram of compounds that may have formed in the experiment,using first-principles calculations for evolutionary crystal structure prediction and *** from the hypothesis that the observed T_(c) may be realized by successive heating upon a pre-formed LaH_(10) phase,we examine plausible ternaries of lanthanum,hydrogen and other elements present in the diamond anvil cell: boron,nitrogen,carbon,platinum,gallium,*** find that only boron and,to a lesser extent,gallium form metastable superhydride-like structures that can host high-T_(c) superconductivity,but the predicted T_(c)’s are incompatible with the experimental *** results indicate that,while the claims of hot superconductivity should be reconsidered,it is very likely that unknown H-rich ternary or multinary phases containing lanthanum,hydrogen,and possibly boron or gallium may have formed under the reported experimental conditions,and that these may exhibit superconducting properties comparable,or even superior,to those of currently known hydrides.

关键词： hydrides boron superconductivity