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合成和研究稀土区质子滴线附近的6种新核素

高能物理与核物理 1999年第6期23卷 589-593页

作者：徐树威李占奎谢元祥潘强岩于涌王春芳邢建萍胡青元李世洪陈红艳张天梅靳根明罗亦孝 J.Adam Yu.Penionzhkevich Yu.Gangrsky 中国科学院近代物理研究所兰州730000 Flerov Laboratory of Nuclear Reactions JINRDubnaRussia

利用兰州重离子加速装置（HIRFL）的SFC加速器引出的能量为165—180MeV的36Ar重离子束，分别轰击92Mo、96Ru和106Cd缺中子同位位素靶，产生了稀土区质子滴线附近的新核素125Nd、128Pm、129Sm、137Gd1）、139Dy和139Tb.借助高灵敏度的氦... 详细信息

利用兰州重离子加速装置（HIRFL）的SFC加速器引出的能量为165—180MeV的36Ar重离子束，分别轰击92Mo、96Ru和106Cd缺中子同位位素靶，产生了稀土区质子滴线附近的新核素125Nd、128Pm、129Sm、137Gd1）、139Dy和139Tb.借助高灵敏度的氦喷嘴快速带传输系统和“p-γ”或“X-γ”符合测量方法对它们进行了分离鉴别，确定它们的半衰期分别为（0．60±0．15）s，（1．0±0．3）s，（0．55±0．10）s，（2．2±0．2）s，（0．6±0．2）s和（1．6±0．2）s，并测量了125Nd、128Pm、129Sm、137Gd和139Dy的β延发质子能谱，指认了能量为109．0和119．7keV的两条γ射线属于139Tb的EC／β＋衰变．

关键词：新核素质子滴线 β延发质子先驱核

Modern quark matter equations of state vs. compact star observations

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Modern quark matter equations of state vs. compact star obse...

Analysis of shower particle pseudorapidity spectra in interactions of relativistic Au and Pb ions with emulsion nuclei

The 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions

作者： David Blaschke Institute of Physics Rostock UniversityGermanyBogoliubov Laboratory for Theoretical PhysicsJINR DubnaRussia

＜正＞Recently, observations of compact stars have provided new data of high accuracy which put strong constraints on the high-density behaviour of the equation of state of strongly interacting matter otherwise not accessible in terrestrial laboratories . The simultaneous measurement of high mass （M ＞ 2 M-）, radius （R ＞ 12 km） and surface redshift （z = 0.35） for EXO 0748-676 rules out soft equations of state and has provoked a debate whether the occurence of quark matter in

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Chinese Physics C 2011年第12期35卷 1095-1099页

作者： B.Z.Belashev M.K.Suleymanov S.Vokál J.Vrláková M.Ajaz Ali Zaman K.H.Khan Z.Wazir Institute of Geology Karelian Research Center Russian Academy of Sciences St. Petrozavodsk Russia COMSATS Institute of Information Technology Department of Physics Islamabad 44000 Pakistan Veksler and Baldin Laboratory of High Energy Physics JINR Dubna 141980 Russia P. J. afárik University Koice Slovakia

The pseudorapidity spectra of fast particles （with β 〉 0.7） produced in Au （at 11.6 A GeV） and Pb （at 158 A GeV） induced collisions with emulsion （Em） nuclei contain some visual plateaus and shoulders. The plateau is wider for Pb＋Em reactions compared with the Au＋Em ones. The existence of a plateau is expected for parton models. The Fourier transformation and maximum entropy methods were used to get additional information about the plateaus. The dependence of the plateaus on the centrality of the collisions was also studied using the number of g-particles to fix centrality. It shows that the maximum entropy method could confirm the existence of the plateau and the shoulder on distributions.

关键词： pseudorapidity spectra s-particles g-particles centrality Fourier transformation maximum entropy

On the Solution to the Separated Equation in the 3-Particle Calogero-Moser Problem

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Advances in Pure Mathematics 2018年第3期8卷 266-271页

作者： Natalia Inozemtseva Jaroslav Dittrich Vladimir Inozemtsev University “DUBNA” Dubna Russia Nuclear Physics Institute CAS Rez Czech Republic BLTP jinr Dubna Russia

We propose the exact solution of the equation in separated variable which appears in the process of constructing solutions to the quantum Calogero-Moser three-particle problem with elliptic two-particle potential . This solution is found for special values of coupling constants . It can be used for solving three-particle Calogero-Moser problem under the appropriate boundary conditions.

关键词： Calogero-Moser Model 3-Particle Problem Separation of Variables

Measurement of (di)muons from heavy flavour decay in p-p collisions at 14 TeV with ALICE at the LHC

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Chinese Physics C 2010年第9期34卷 1538-1540页

作者：张晓明 L. Manceau N. Bastid P. Crochet S. Grigoryan 周代翠 Central China Normal University Institute of Particle Physics Wuhan China Clermont UniversitY Universite Blaise Pascal CNRS/IN2P3 LPC BP 10448 F-63000 Clermont-Ferrand Yerevan Physics Institute Yerevan Armenia Joint Institute for Nuclear Research (jinr) Dubna Russia

We present the performance of the ALICE muon spectrometer for measuring the charm and beauty inclusive p t differential production cross sections via single muons and unlike-sign dimuons in proton-proton collisions at... 详细信息

关键词： ALICE muon spectrometer heavy flavour pQCD

Solving Systems of Transcendental Equations Involving the Heun Functions

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American Journal of Computational Mathematics 2012年第2期2卷 95-105页

作者： Plamen P. Fiziev Denitsa R. Staicova B-Layer Task Force JINR Moscow Russia Department of Theoretical Physics Sofia University “St. Kliment Ohridski” Sofia Bulgaria

The Heun functions have wide application in modern physics and are expected to succeed the hypergeometrical functions in the physical problems of the 21st century. The numerical work with those functions, however, is complicated and requires filling the gaps in the theory of the Heun functions and also, creating new algorithms able to work with them efficiently. We propose a new algorithm for solving a system of two nonlinear transcendental equations with two complex variables based on the Müller algorithm. The new algorithm is particularly useful in systems featuring the Heun functions and for them, the new algorithm gives distinctly better results than Newton’s and Broyden’s methods. As an example for its application in physics, the new algorithm was used to find the quasi-normal modes (QNM) of Schwarzschild black hole described by the Regge-Wheeler equation. The numerical results obtained by our method are compared with the already published QNM frequencies and are found to coincide to a great extent with them. Also discussed are the QNM of the Kerr black hole, described by the Teukolsky Master equation.

关键词： Root-Finding Algorithm Müller Algorithm Two-Dimensional Müller Algorithm Regge-Wheeler Equation Quasinormal Modes Teukolsky Master Equation

Neutron Activation Analyses Used to Study Elemental Accumulation in Some Marine Macrophytes (Mediterranean Sea Coast of Egypt)

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American Journal of Analytical Chemistry 2017年第6期8卷 395-405页

作者： N. Nassar A. Kravtsova M. Frontasyeva M. M. Sherif Department of Physics Faculty of Science Cairo University Giza Egypt FLNP jinr Dubna Russia The A.O. Kovalevsky Institute of Marine Biological Research of RAS Sevastopol Russia

The concentrations of Na, Mg, Al, S, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se Br, Rb, Sr, Zr, Mo, Ag, Sb, I, Cs, Ba, La, Sm, Eu, Tb, Yb, Hf, Ta, W, Au, Th and U in 6 types of marine macrophytes (algae and seagrass): Gelidium pusillum (Stackhouse) Le Jolis, Ulva intestinalis Linnaeus, Amphiroa rigida J.V. Lamouroux, Hypnea sp., Cystoseira sp. and Posidonia oceanica (L.) Delile (seagrass) collected from 3 stations along the Mediterranean Sea coast of Egypt were determined using instrumental neutron activation analysis. The contents of elements in marine macrophytes indicated that they accumulated elements at different levels depending on their type of species (brown, red, green and seagrass) and the ambient water conditions. However, the concentrations of Cr, Co, Ni, Se, Zr, Mo, Ag, Cs, La, Sm, Eu, Yb, Hf, Ta, Au and U were very similar in all samples. In general the levels of classically investigated elements, particularly Mn, Fe, Co, Ni and Zn determined in the macrophytes in the present study are lower or within the wide range of values previously reported for species of these genera sampled along the Egyptian Mediterranean coast.

关键词： Algae and Seagrass Elemental Analysis Mediterranean Sea Neutron Activation Analysis

Model-independent constraints on spin observables

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Chinese Physics C 2009年第12期33卷 1153-1158页

作者： Jean-Marc Richard Xavier Artru Mokhtar Elchikh Jacques Soffer Oleg Teryaev LPSC Université Joseph Fourier CNRS/IN2P3 INPG Grenoble France Université de Lyon IPNL Université Lyon 1 and CNRS/IN2P3 Villeurbanne France Université des Sciences et de Technologie d'Oran El Menauoer Oran Algeria Physics Department Temple University Philadelphia PA 19122 -6082 USA Bogoliubov Laboratory of Theoretical Physics JINR 141980 Dubna Russia

We discuss model-independent constraints on spin observables in exclusive and inclusive reactions, with special attention to the case of photoproduction.

关键词： spin observables positivity exclusive reactions inclusive reactions

Molecular Dynamics Simulations of Perovskites: The Effect of Potential Function Representation on Equilibrium Structural Properties

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Open Journal of Physical Chemistry 2015年第4期5卷 110-121页

作者： Kholmirzo T. Kholmurodov Sagille A. Ibragimova Pavel P. Gladishev Anatoly V. Vannikov Alexey R. Tameev Tatyana Yu. Zelenyak Frank Laboratory of Neutron Physics JINR Dubna Russia Dubna International University Dubna Russia A.N. Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences Moscow Russia

The perovskites with general formula ABX3 have been widely used as for materials with their unique properties (ferroelectric, piezoelectric, dielectric, catalytic and so on). Hybrid organolead halide perovskites are a class of semiconductors with ABX3 (X = Cl, Br, and I) structures consisting of lead cations in 6-fold coordination (B site), surrounded by an octahedron of halide anions (X site, face centered) together with the organic components in 12-fold cub octahedral coordination. These hybrid perovskites have a direct band gap, a large absorption coefficient as well as high charge carrier mobility that represent a very attractive characteristic of cost-effective solar cells. Basically, these crystals are inorganic solids of CaTiO3 type held together by bonds that are either ionic or partially ionic and partially covalent. In spite of the partially covalent character of the Ti-O bond, the system is modeled by a two-body central force interatomic potential (the form of the Vashishta and Rahman interatomic potential), which has been used successfully for many materials with a perovskite structure. In the present work using molecular dynamics (MD) simulation method we investigate the dynamical and structural behavior of CaTiO3 perovskite at normal pressure and temperature conditions. The MD calculations were performed on a system of 16,000 particles (3200Ca + 3200Ti + 96,00O), initially in an orthorhombic-Pbnm structure. The orthorhombic MD box had edges Lx = 53.4 Å, Ly = 53.4 Å and Lz = 61.12 Å, which provided a density matching the experimental value of ρ = 4 g/cm3. Starting with this structure and using proposed interatomic potentials the MD system stabilizes at room temperature in its initial configuration. The aim of the present study to explore the effect of potential function representations on structural equilibrium properties for the perovskite models including hybrid halide ones outlined above. Concerning the perovskite equilibrium state we

关键词： Perovskites Halides Potential Functions Structural Properties MD Simulations