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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.

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.

Fomichev A.S.,Joint Institute for Nuclear Research | Bezbakh A.A.,Joint Institute for Nuclear Research | Chudoba V.,Silesian University in Opava | Egorova I.A.,Joint Institute for Nuclear Research | And 24 more authors.
EPJ Web of Conferences | Year: 2012

The 1H(6Li,6Be)n charge-exchange reaction and the 3H(8He, p)10He two-neutron transfer reaction were recently carried out at the ACCULINNA fragment separator (FLNR, Dubna) to populate the ground and excited states of 6Be and 10He nuclei, respectively. The 6Be ET spectrum (ET is the 6Be energy above its 4He+p+p decay threshold) was obtained with high statistics and described by the well-known 0+ ground state of 6Be at ET = 1.37 MeV, the 2+ state at ET = 3.05 MeV and a broad structure extending from 4 to 16 MeV which could be interpreted as the isovector soft dipole mode associated with the 6Li ground state. In the 10He case the 0+ ground state was found at about 2.1(2) MeV (T ∼ 2 MeV) above the 8He+n+n breakup threshold. Angular correlations observed for 10He decay products show prominent interference patterns allowing to draw conclusions about the structure of low-energy excited states: 1- (E T ∼ 5 MeV) and 2+ (ET > 6 MeV). © Owned by the authors 2012.

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.

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