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Dubna, Russia

The Joint Institute for Nuclear Research, JINR , in Dubna, Moscow Oblast , Russia, is an international research centre for nuclear science, with 5500 staff members, 1200 researchers including 1000 Ph.D's from eighteen member states . Most scientists, however, are eminent Russian scientists. The Institute has seven laboratories, each with its own specialisation: theoretical physics, high energy physics , heavy ion physics, condensed matter physics, nuclear reactions, neutron physics, and information technology. The institute has a division to study radiation and radiobiological research and other ad hoc experimental physics experiments.Principal research instruments include a nuclotron superconductive particle accelerator , three isochronic cyclotrons , a phasotron and a synchrophasotron . The site has a neutron fast-pulse reactor with nineteen associated instruments receiving neutron beams. Wikipedia.

Pokotilovski Yu.N.,Joint Institute for Nuclear Research
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

A new limit is presented on the axion-like monopole-dipole P, T-non-invariant coupling in a range (10- 4 - 1)   cm. The gradient of spin-dependent nucleon-nucleon potential between 3He nucleus and nucleons and electrons of the walls of a cell containing polarized 3He gas should affect its spin relaxation rate. The limit is obtained from the existing data on the relaxation rate of spin-polarized 3He. © 2010 Elsevier B.V. All rights reserved. Source

Selyugin O.V.,Joint Institute for Nuclear Research
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

On the basis of the representation of the generalized structure of nucleons a new model of the hadron interaction at high energies is presented. A new t dependence of the generalized parton distributions is obtained from the comparative analysis of different sets of the parton distribution functions, based on the description of the entire set of experimental data for the electromagnetic form factors of the proton and neutron. Taking into account the different moments of the generalized parton distributions of the hadron, quantitative descriptions of all existing experimental data of the proton-proton and proton-antiproton elastic scatterings from s=9.8GeV to 8 TeV, including the Coulomb range and large momentum transfers up to -t=15GeV2, are obtained with a few free high-energy fitting parameters. The real part of the hadronic elastic scattering amplitude is determined only through the complex s that satisfies the dispersion relations. The negligible contributions of the hard Pomeron and the presence of the non-small contributions of the maximal Odderon are obtained. The non-dying form of the spin-flip amplitude is examined as well. The structures of the Born term and unitarized scattering amplitude are analyzed. It is shown that the black disk limit for the elastic scattering amplitude is not reached at LHC energies. Predictions for LHC energies are made. © 2015 American Physical Society. Source

Nesterenko A.V.,Joint Institute for Nuclear Research
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

The dispersive approach to QCD is applied to the study of the inclusive τ lepton hadronic decay. This approach provides the unified integral representations for the hadronic vacuum polarization function, related R function, and Adler function. These representations account for the intrinsically nonperturbative constraints, which originate in the kinematic restrictions on the functions on hand, and retain the effects due to hadronization, which play a valuable role in the analysis of the strong interaction processes at low energies. The dispersive approach proves to be capable of describing recently updated ALEPH and OPAL experimental data on inclusive τ lepton hadronic decay in vector and axial-vector channels. The vicinity of values of the QCD scale parameter obtained in both channels testifies to the potential ability of the developed approach to describe the aforementioned data in a self-consistent way. © 2013 American Physical Society. Source

Pfutzner M.,University of Warsaw | Karny M.,University of Warsaw | Grigorenko L.V.,Joint Institute for Nuclear Research | Riisager K.,University of Aarhus
Reviews of Modern Physics | Year: 2012

The last decades brought impressive progress in synthesizing and studying properties of nuclides located very far from the beta stability line. Among the most fundamental properties of such exotic nuclides, the ones usually established first are the half-life, possible radioactive decay modes, and their relative probabilities. When approaching limits of nuclear stability, new decay modes set in. First, beta decays are accompanied by emission of nucleons from highly excited states of daughter nuclei. Second, when the nucleon separation energy becomes negative, nucleons start being emitted from the ground state. A review of the decay modes occurring close to the limits of stability is presented. The experimental methods used to produce, identify, and detect new species and their radiation are discussed. The current theoretical understanding of these decay processes is reviewed. The theoretical description of the most recently discovered and most complex radioactive process-the two-proton radioactivity-is discussed in more detail. © 2012 American Physical Society. Source

Korobov V.I.,Joint Institute for Nuclear Research
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We consider a general procedure to evaluate the Bethe logarithm for a general few-body atomic or molecular system. As benchmarks we use calculations for the ground states of a helium atom and a H 2 + molecular ion. The obtained values are β He=4.37016022306(2) for the helium atom and βH 2 +=3.012230335(1) for the H 2 +molecular ion. Both results substantially improve the best-known values for these quantities. © 2012 American Physical Society. Source

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