All Russian Research Institute of Experimental Physics

Sarov, Russia

All Russian Research Institute of Experimental Physics

Sarov, Russia
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Sidorchuk S.I.,Joint Institute for Nuclear Research | Bezbakh A.A.,Joint Institute for Nuclear Research | Chudoba V.,Silesian University in Opava | Egorova I.A.,Bogolyubov Laboratory of Theoretical Physics | And 23 more authors.
Physical Review Letters | Year: 2012

The 0+ ground state of the He10 nucleus produced in the H3(He8,p)He10 reaction was found at about 2.1±0.2MeV (Γ∼2MeV) above the three-body He8+n+n breakup threshold. Angular correlations observed for He10 decay products show prominent interference patterns allowing us to draw conclusions about the structure of low-energy excited states. We interpret the observed correlations as a coherent superposition of a broad 1- state having a maximum at energy 4-6 MeV and a 2+ state above 6 MeV, setting both on top of the 0+ state "tail." This anomalous level ordering indicates that the breakdown of the N=8 shell known in Be12 thus extends also to the He10 system. © 2012 American Physical Society.

Krupko S.A.,Joint Institute for Nuclear Research | Fomichev A.S.,Joint Institute for Nuclear Research | Grigorenko L.V.,Helmholtz Center for Heavy Ion Research | Grigorenko L.V.,RAS Research Center Kurchatov Institute | And 21 more authors.
EPJ Web of Conferences | Year: 2014

The new facility fragment separator ACCULINNA-2 will be put into operation at the beginning of 2015 in FLNR JINR. The new separator is destined to add considerably to the studies of drip-line nuclei performed with the use of variety of direct reactions known to be distinctive to the 15 - 50 MeV/amu exotic secondary RIBs. Intense beams provided by the U-400M cyclotron will ensure the achievement of this objective. In addition to the RIB separation accomplished by means of the dipole-wedge-dipole selection, the addition of a zero-degree dipole magnet setup is foreseen. A long (13 m) straight section will provide precise time-of-flight measurements. © Owned by the authors, published by EDP Sciences, 2014.

Razin A.N.,All Russian Research Institute of Experimental Physics | Nevmerzhitskii N.V.,All Russian Research Institute of Experimental Physics | Sotskov E.A.,All Russian Research Institute of Experimental Physics | Sen'kovskii E.D.,All Russian Research Institute of Experimental Physics | And 5 more authors.
Journal of Applied Mechanics and Technical Physics | Year: 2017

The interaction of a shock wave with turbulent flow was experimentally investigated. The case where a shock wave formed at one end of the tube, passed through the interface between two quiescent gases with different densities (air–CO2 or air–Ar), was reflected from the end of the tube, and interacted with the zone of turbulent mixing formed at the interface. The Mach number of the shock wave incident on the interface in air was M ≈ 2.37–2.57. The flow field was recorded using the schlieren method and high-speed video recording. It was found that after passing the mixing zone, the shock-wave front was deformed and became unstable. © 2017, Pleiades Publishing, Ltd.

Yanilkin Y.V.,All Russian Research Institute of Experimental Physics | Goncharov E.A.,All Russian Research Institute of Experimental Physics | Kolobyanin V.Y.,All Russian Research Institute of Experimental Physics | Sadchikov V.V.,All Russian Research Institute of Experimental Physics | And 3 more authors.
Computers and Fluids | Year: 2013

In Arbitrary Lagrangian-Eulerian (ALE) methods for hydrodynamics with several materials, multiple-material Lagrangian cells invariably arise when the flow field is remapped onto a new mesh. One must close the system of equations for multi-material cells; this, in effect, constitutes a model-either explicit or implicit-for the sub-scale dynamics. We discuss several different multi-material closure model algorithms for Lagrangian hydrodynamics under the assumption of a single velocity for 1D, multiple-material cells. Russian researchers at the All-Russian Research Institute of Experimental Physics (VNIIEF) have developed several models, which we describe in some detail; recent work by US researchers was developed independent of the details of these models. This work contains a comparison of these different approaches, which we believe is unique in the literature. We compare these methods on two standard test problems and discuss the results. © 2012 Elsevier Ltd.

Garanin S.F.,All Russian Research Institute of Experimental Physics | Burenkov O.M.,All Russian Research Institute of Experimental Physics | Ivanova G.G.,All Russian Research Institute of Experimental Physics | Sofronov V.N.,All Russian Research Institute of Experimental Physics | And 3 more authors.
PPPS 2001 - Pulsed Power Plasma Science 2001 | Year: 2015

MHD plasma flow transverse to a magnetic field in a bounded domain, initially set in a form of a sole vortex, is solved numerically. This problem is of interest for dynamic magnetized plasma systems such as the MAGO/MTF system. For plasma subsequent compression issues in those systems, it is important to know how long the hydrodynamic motion persists in them. This can affect convective plasma cooling and result in impurities entering into the plasma due to wall washing by this flow. A case of large Reynolds numbers (and large magnetic Reynolds) and small Alfven-Mach number MA is considered, i.e. it is assumed that the initial relaxation due to magnetosonic shock waves has already occurred. In this case the MHD problem reduces to a problem of 2D hydrodynamic turbulence. Calculations showed that, as it should be for 2D turbulence and in contrast to the case of the 3D turbulence, kinetic energy dissipation proceeds very slowly at small MA, for times ∼ L2/v (L is the characteristic system size, v is kinematic viscosity). When MA is not small, the kinetic energy dissipation is caused by emission of magnetosonic waves and their subsequent nonlinear (shock-wave) damping. © 2002 IEEE.

Generalov L.N.,All Russian Research Institute of Experimental Physics | Zherebtsov V.A.,All Russian Research Institute of Experimental Physics | Taova S.M.,All Russian Research Institute of Experimental Physics
Bulletin of the Russian Academy of Sciences: Physics | Year: 2016

The OptModel high-precision optical-model program code aimed at solving a wide set of problems related to the elastic scattering and n, p, d, t, 3,4,6He, 6Li nuclear reactions on spherical nuclei (or ones close to spherical) is described. A phenomenological optical potential in the Woods–Saxon form is used in this code. The main features of the program are described. The technique for solving a Schrödinger radial equation in the interior region is given in detail. The results from tests and research calculations are described. The results from executing a simultaneous analysis of a great deal of experimental data on elastic scattering at different energies to obtain the energy dependence of optical potential parameters are also presented. © 2016, Allerton Press, Inc.

Bazanov A.A.,All Russian Research Institute of Experimental Physics | Ivanovskii A.V.,All Russian Research Institute of Experimental Physics | Shaidullin V.S.,All Russian Research Institute of Experimental Physics
Technical Physics | Year: 2014

A model of a disk-shaped explosive magnetic generator 400 mm in diameter with an initial energy storage capacity of about 40 MJ is considered. The generator is integrated with a cumulative current pulse shaper and is also equipped with a remote magnetodynamic interrupter. Calculations show that this generator is capable of forming current pulses with an amplitude of up to 20 MA and a rise time of about 130 ns in finiteinductance (~10 nH) dynamic loads. This allows rapid (for about 60 ns) compression of light (20-30 mg) liners to generate intense beams of soft X rays. Results obtained using a computational model of the magnetodynamic interrupter, which is the key component of the generator, are verified experimentally. © 2014 Pleiades Publishing, Ltd.

Anderson B.G.,Los Alamos National Laboratory | Anderson W.E.,Los Alamos National Laboratory | Atchison W.L.,Los Alamos National Laboratory | Bartsch R.R.,Los Alamos National Laboratory | And 18 more authors.
PPPS 2001 - Pulsed Power Plasma Science 2001 | Year: 2015

A liner implosion experiment was conducted on facility Pegasus-2, in which two perturbation type growth was compared. On one half (through height) of the cylindrical liner sinusoidal azimuthally symmetric perturbations were produced. On the other liner half the perturbations were of the same wavelength and the same amplitude, but the angle between the wave vector and the cylinder axis was 45° (screw perturbations). The experimental radiographs show that there is essentially no screw perturbation growth, while the azimuthally symmetric perturbations grow many-fold. This result agrees with the theoretical predictions. © 2002 IEEE.

Chernychev V.K.,All Russian Research Institute of Experimental Physics | Korchagin V.P.,All Russian Research Institute of Experimental Physics | Babich L.P.,RAS Federal Nuclear Center | Burenkov O.M.,RAS Federal Nuclear Center | And 18 more authors.
IEEE Transactions on Plasma Science | Year: 2016

Magnitnoe Obzhatie (MAGO)/magnetized target fusion (MTF) thermonuclear experiments executed with a goal of producing the target plasma heated up to temperatures of hundreds of electronvolts, intended for subsequent compression by an imploding liner accelerated by explosion products, are reviewed. In MAGO/MTF experiments, plasma chambers were used consisting of two or three compartments connected by narrow nozzles: acceleration cylinder compartment and deceleration/fusion compartments (cylindrical or hemispherical). A technology of plasma chamber laboratory conditioning is described. Neutron and soft X-ray pulses are presented and obtained in experiments with chambers powered by an explosive magnetic generator. Irrespective of the chamber geometry and number of compartments, the X-ray pulse consists of a highly intensive peak with a duration of 1 μs and more than a 10-μs-long low-intensity tail. The neutron pulse is time coincident with the X-ray peak. Yields up to 1013 neutrons were detected in experiments with two-compartment chambers. Three-compartment chambers with an intermediate compartment are believed to be more promising for the compression. The results are described of the latter MAGO-IX experiment, the only successful experiment with the three-compartment chamber, in which the yield of 2 × 1012 neutrons was detected in the third compartment and the yield in the middle compartment was many times lower. © 2016 IEEE.

Myakin S.V.,St Petersburg State Technological Institute | Zagranichek A.L.,St Petersburg State Technological Institute | Sychev M.M.,St Petersburg State Technological Institute | Vasil'Eva I.V.,Ltd Liability Company | And 5 more authors.
Russian Journal of Applied Chemistry | Year: 2011

Changes in the structure and optical and electrical properties of Apical brand polyimide films under the action in air of accelerated electrons with an energy of 0.5 MeV and absorbed dose varied in the range 1-300 MGy were studied. © 2011 Pleiades Publishing, Ltd.

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