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Study of neutron density fluctuation and neutron-proton correlation in Au+Au collisions using PYTHIA8/Angantyr

Chinese physics C 2023年第11期47卷 62-67页

作者：张祖满李莎喻宁林健平李双汤思宇周代翠 School of physics and Mechanical Electrical&Engineering Hubei University of EducationWuhan 430205China Institute of theoretical physics Hubei University of EducationWuhan 430205China Key Laboratory of Quark and Lapten physics(MOE) Central China Normal UniversityWuhan 430079China College of Science China Three Gorges UniversityYichang 443002China center for Astronomy and Space Sciences China Three Gorges UniversityYichang 443002China School of Mathematical&Physical Sciences Wuhan Textile UniversityWuhan 430200China

Utilizing the PYTHIA8 Angantyr model,which incorporates the multiple-parton interaction(MPI)based color reconnection(CR)mechanism,we study the relative neutron density fluctuation and neutron-proton correlation in Au+Au collisions at√sNN=7.7,11.5,14.5,19.6,2.,39,62.4,and 2.0 *** this study,we not only delve into the dependence of these two remarkable observations on rapidity,centrality,and energy,but also analyze their interplay with the MPI and *** results show that the light nuclei yield ratio of protons,deuterons,and tritons,expressed by the elegant expression N_(t)N_(p)/N^(d)^(2.,remains unchanged even as the rapidity coverage and collision centrality ***,we also reveal that the effect of CR is entirely dependent on the presence of the MPI;CR has no impact on the yield ratio if the MPI is *** findings further demonstrate that the light nuclei yield ratio experiences a slight increase with increasing collision energy,as predicted by the PYTHIA8 Angantyr model;however,it cannot describe the non-monotonic trend observed by the STAR *** on the Angantyr model simulation results,it is essential not to overlook the correlation between neutron and proton *** Angantyr model is a good baseline for studying collisions in the absence of a quark-gluon plasma system,given its lack of flow and jet quenching.

关键词： relativistic heavy-ion collisions quark deconfinement quark-gluon plasma production phase transitions

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An Analog of Einstein’s General Relativity Emerging from Classical Finite Elasticity Theory:Analytical and Computational Issues

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Communications in Computational physics 2013年第8期14卷 801-818页

作者： C.Cherubini S.Filippi Nonlinear physics andMathematicalModeling Lab University Campus Bio-MedicoI-00128Via A.del Portillo 21RomeItaly International center for Relativistic Astrophysics-I.C.R.A. University of Rome“La Sapienza”I-00185 RomeItaly

The“analogue gravity formalism”,an interdisciplinary theoretical scheme developed in the past for studying several non relativistic classical and quantum systems through effective relativistic curved space-times,is here applied to largely deformable elastic bodies described by the nonlinear theory of solid *** the simplest nonlinear constitutive relation for the elastic material given by a Kirchhoff-St Venant strain-energy density function,it is possible to write for the perturbations an effective space-time metric if the deformation is purely longitudinal and depends on one spatial coordinate *** and numerical studies of the corresponding dynamics are performed in selected cases and physical implications of the results obtained are finally discussed.

关键词： Finite elasticity general relativity analogue gravity finite elements method

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Chaotic Fractal Tiling for the Missing Dark Energy and Veneziano Model

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Applied Mathematics 2013年第11期4卷 22-29页

作者： L. Marek-Crnjac1], M. S. El Naschie2. Technical school center mariborslovenia Department of physics faculty of scienceuniversity of alexandriaalexandriaegypt

The formula for the quantum amplitude of the Veneziano dual resonance model is shown to be formally analogous to the dimensionality of a K-theoretical fractal quotient manifold of the non-commutative geometrical type. Subsequently this analogy is used to deduce the ordinary energy of the quantum particle and the dark energy of the quantum wave. The results agree completely with cosmological measurements. Even more surprisingly the sum of both energy expressions turned out to be exactly equal to Einstein’s iconic formula E = mc2. Consequently Einstein’s formula makes no distinction between ordinary and dark energy.

关键词： Hausdorff Dimension Cantor Set Dark Energy K?hler Manifold Quantum Entanglement Veneziano Model

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Sulfur-vacancy-tunable interlayer magnetic coupling in centimeter-scale M0S2.bilayer

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Nano Research 2022年第2期15卷 881-888页

作者： Hengli Duan Guinan Li Hao Tan Chao Wang Qian Li Chuanchuan Liu Yuewei Yin Xiaoguang Li Zeming Qi Wensheng Yan National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Hefei National Laboratory for Physical Sciences at the Microscale Department of Physicsand CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230026China

Endowing bilayer transition-metal dichalcogenides(TMDs)with tunable magnetism is significant to investigate the coupling of multiple electron degrees of freedom(DOFs).However,effectively inducing and tuning the magnetic interaction of bilayer TMDs are still ***,we report a strategy to tune the interlayer exchange interaction of centimeter-scale MoS2.bilayer with substitutional doping of Co ion,by introducing sulfur vacancy(V_(s))to modulate the interlayer electronic *** strategy could transform the interlayer exchange interaction from antiferromagnetism(AFM)to ferromagnetism(FM),as revealed by the magnetic *** characterizations and theoretical calculations indicate that the enhanced magnetization is mainly because the hybridization of Co 3d band and Vs-induced impurity band alters the forms of interlayer orbital hybridizations between the partial Co atoms in upper and lower layers,and also enhances the intralayer *** work paves the way for tuning the interlayer exchange interaction with defects and could be extended to other two-dimensional(2.)magnetic materials.

关键词： interlayer exchange interaction 2. magnetic materials S-vacancy interlayer coupling large-area growth

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Investigation of point-contact Andreev reflection on magnetic Weyl semimetal Co3Sn2.2

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Science China(physics,Mechanics & Astronomy) 2020年第8期63卷 107-113页

作者： He Wang YanZhao Liu HuiBin Zhou HaoRan Ji JiaWei Luo JiaWei Zhang TianHeng Wei PinYuan Wang Shuang Jia Jian Wang Department of physics Capital Normal UniversityBeijing 100048China International center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation center of Quantum Matter Beijing 100871China CAS center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100193China

Magnetic Weyl semimetals(WSMs)with broken time-reversal symmetry(TRS)hosting topological band structures are expected to provide an ideal platform for investigating topological superconductivity and ***,the experimental verification of magnetic WSMs is very *** recently,the kagome magnet Co3Sn2.2.was confirmed to be a magnetic WSM by both angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy and consequently has become the focus of great *** paper reports a point-contact Andreev-reflection spectroscopy(PCARS)investigation on the(001)surface and the side surface of the Co3Sn2.2.single crystals,*** measurements from the sample’s(001)and side surfaces provide experimental evidence for transport spin polarization in the Co3Sn2.2.magnetic ***,the superconducting proximity effect in the Co3Sn2.2.single crystal is successfully *** point-contact spectra(PCS)along the in-plane direction cannot be well fitted by theoretical models based on s-wave pairing,indicating that possible triplet p-wave superconductivity may be triggered at the interface,which paves the way for the future exploration of the topological superconductivity and Majorana states in broken TRS WSMs.

关键词： magnetic Weyl semimetal point contact pairing symmetry superconducting proximity effect

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Structural,morphological and photoluminescence characterizations of Sm^(3+) doped Y_(2.O_(3) nano-sized phosphors synthesized by ultrasound assisted sol-gel method

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Journal of Rare Earths 2023年第1期41卷 51-59页

作者： Lyes Lamiri Badis Kahouadji Mourad Berd Abdelmoumen Abdellatif Lotfi Benchallal Lakhdar Guerbous Salim Ouhenia Abdelhafid Souici Leila Amiour Abdelhalim Zoukel Madani Samah Department of TCSN University of BejaiaBejaia06000Algeria Department of Technology University of BejaiaBejaia06000Algeria Department of Technology Laboratory of LECVEUniversity of BejaiaBejaiaO6000Algeria Department of physics of Materials University of Science and Technology Houari BoumedieneAlgiersAlgeria Laser Department/nuclear Research center of Algiers(CRNA) 02Boulevard Frantz FanonB.P.399Algiers16000Algeria Laboratory of Physical-chemistry University of BejaiaBejaia06000Algeria Phase Transformation Laboratory Universite Freres Mentouri Constantine 1Algeria Laboratory Physico-Chemistry of Materials Laghouat UniversityTechnical Platform of Physico-Chemical Analysis(PTAPC-Laghouat-CRAPC)LaghouatAlgeria

Nanosized 1 at% Sm^(3+)doped Y_(2.O_(3)powders were prepared by an ultrasound assisted sol-gel method.Y_(2.O_(3):Sm^(3+)powders crystallize in Y_(2.O_(3)pure cubic phase and XRD analysis shows that the as-used agitation protocol affects strongly the crystallite’s shape and mean *** recorded emission spectra under λ_(em)=600 nm exhibit two absorption bands;the first one is assigned to O^(2.)→Sm^(3+)charge transfer state(CTS) with a maximum absorption at 2.3 nm,and the second is due to intraconfigurational transition 4f^(5)-4f^(5) of Sm^(3+) with a maximum absorption at 407 *** 2.3 and 407 nm transitions are attributed to characteristics intra-configurational transitions of Sm^(3+).All emission spectra are dominated by reddish/orange luminescence located at 606 nm and assigned to ^(4)G_(5/2.→^(6)H_(7/2. *** is found that the photoluminescence intensity of samples obtained under excitation at 407 nm is 60 times smaller than that obtained under 2.3 nm *** time measurements of the ^(4)G_(5/2.→^(6)H_(7/2. luminescence transition indicate that decay time of nano-sized powder is significantly shorter than bulk material one.

关键词： Y_(2.O_(3):Sm^(3+)nano-sized powder Sol-gel method Ultrasound Charge transfer Photoluminescence Rare earths

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ssDNA functionalized nanodiamonds for uranium decorporation

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Chinese Chemical Letters 2022年第7期33卷 3570-3572页

作者： Qinglong Yan Yu Miao Xiaomei Wang Jifei Ma Juan Diwu Ying Zhu Shuao Wang Chunhai Fan Interdisciplinary Research center Shanghai Synchrotron Radiation FacilityZhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 201210China Shanghai Institute of Applied physics Chinese Academy of SciencesShanghai 201800China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and National Center for Translational MedicineShanghai Jiao Tong UniversityShanghai 200240China

The hunt for agents that are suitable for actinide decorporation to reduce the whole-body load of actinide in accidental internal exposure is the ever-lasting goal in radiation protection and medical treatment in nuclear *** current decorporation agents can be categorized as two groups,one is the molecular ligands,and the other is the nanoparticles decorated with molecular *** in this work,functional nanodiamonds(fN Ds)with ss DNA(the endogenous biomacromolecule rich in phosphate groups)loaded on the NDs is reported,which poses good uranyl adsorption selectivity,high cellular uptake,fast excretion,and effective decorporation of uranyl from rat renal proximal tubular epithelial cells(NRK-52.).All those results corroborate that f NDs can potentially serve as a brand new family of chelators for actinide decorporation.

关键词： Nanodiamond ssDNA Uranium Decorporation

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Deuterium Clusters Fusion Induced by the Intense Femtosecond Laser Pulse

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Chinese physics Letters 2007年第2期24卷 494-496页

作者：刘红杰郑志坚谷渝秋张保汉李镛周南性模韩载旻李勇雨芮权海陈家斌王红斌焦春晔何颖玲温天舒温贤仑陈铭 Laser fusion research center China Academy of Engineering Physics Mianyang China 621900 National Key Lab. of High Temperature intense Plasma -Phys-ics Mianyang China 621900 Korea Atomic Energy Research Institute P.O.BOX 105 Yuseong Daejeon 305-600 Korea

Neutrons （2.45MeV） from deuterium cluster fusion induced by the intense femtosecond （3Ors） laser pulse are experimentally demonstrated. The average neutron yield 103 per shot is obtained. It is found that the yield slightly increases with the increasing laser spot size. No neutron can be observed when the laser intensity I 〈 4.3 × 10^15 W/cm^2.

关键词： HIGH-ENERGY IONS nuclear-FUSION ELECTRON GENERATION ATOMIC CLUSTERS JET EXPLOSIONS EMISSION

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Controlling Metalation Reaction of Phthalocyanine with Cobalt at Single-Molecule Level on Au(111)Surfac

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Chinese Journal of Chemical physics 2021年第4期34卷 419-428,I0002页

作者： Liang Zhu Bin Li Lei Dong Wei Feng Ai-di Zhao Bing Wang Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation center of Quantum Information&Quantum physics University of Science and Technology of ChinaHefei 230026China

Metalation reac-tion of metal-free phthalocyanine molecule with Co atom adsorbed on Au(111)surface has been studied in situ at single atom/molecule scale by low-temperature scanning tunneling microscopy(STM)experiment combined with simulations based on density function theory *** manipulations using STM tip,we showed a controlled manner to have a single metal-free phthalocyanine molecule react with a Co atom to form Co phthalocyanine *** this reaction process,an intermediate state originating from π-d interaction between the metal-free phthalocyanine molecule and Co atom has been identi ***,we also revealed that the redox reaction represented as bond breaking and bond forming relative to the Co and pyrrolic N atoms,not pyrrolic H atoms,is a key process for dehydrogenation and metalation *** DFT calculations provided theoretical supporting for the above conclusions,and further understanding of the related mechanisms.

关键词： Phthalocyanine Metalation reaction Scanning tunneling microscopy

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In situ scattering study of multiscale structural evolution during liquid–liquid phase transition in Mg-based metallic glasses

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Rare Metals 2021年第11期40卷 3107-3116页

作者： Kang-Hua Li Jia-Cheng Ge Si-Nan Liu Shu Fu Zi-Xuan Yin Wen-Tao Zhang Guo-Xing Chen Shao-Chong Wei Hua Ji Tao Feng Qi Liu Xun-Li Wang Xiao-Bing Zuo Yang Ren Horst Hahn Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Suzhou nuclear Power Research Institute Co. LtdSuzhou 215004China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of physics City University of Hong KongHong Kong 999077China center for Neutron Scattering City University of Hong Kong Shenzhen Research InstituteShenzhen 518057China X-Ray Sciences Division Argonne National LaboratoryLemontIL 60439USA Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany

The glass-forming ability of Mg-Cu-Gd alloys could be significantly promoted with the addition of Ag.A calorimetric anomaly could be observed in the supercooled liquid region of the Mg-Cu-Ag-Gd metallic glass,indicating the occurrence of a liquid-state phase transition driven by ***,the underlying mechanism of the polyamorphous phase transition remains *** the paper,in situ scattering techniques were employed to reveal multiscale structure evidence in a Mg65Cu15Ag10Gd10metallic glass with an anomalous exothermic peak upon *** measurements indicate a reentrant behavior for the Mg-Cu-Ag-Gd metallic glass in the anomalous exothermic peak temperature region during *** situ synchrotron diffraction results revealed that the local atomic structure tends to be ordered and loosely packed first,followed by reentering into the initial state upon ***,time-resolved small-angle synchrotron X-ray scattering(SAXS) results show an increase in nanoscale heterogeneity first followed by a reentrant supercooled liquid behavior.A core-shell structure model has been used to fit the SAXS profiles when polyamorphous phase transition *** contrast,there is no structure anomaly for the reference Mg-Cu-Gd alloy *** detailed multiscale structural evidence suggests the occurrence of a liquid-liquid phase transition followed by a reentrant behavior in the MgCu-Ag-Gd metallic *** results deepen the understanding of the structural origin of the glass-forming ability and shed light on the possibility of tuning the physical and mechanical properties by heat-treatment in the supercooled liquid region of Mg-based metallic glasses.

关键词： Metallic glasses Anomalous exothermal peak Polyamorphous transition Synchrotron scattering

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