• ## Novel method for searching critical vicinity of relativistic heavy-ion collision parameters, where dense hadronic matter transits into quark-gluon matter, and proposal for its implementation at the ВM@N and MPD experiments at the NICA accelerator complex

Experimental detection of the critical vicinity of the phase transition of dense hadronic matter into
quark-gluon matter is one of the main goals of the relativistic heavy-ion collisions physics. A novel
method for searching such a vicinity is proposed. Its essence is in selection of ultracentral collision
events, based on the azimuthal isotropy of the distribution of the particles produced in an event and
in search for the behaviour regime change of, for instance, two-dimensional dependence of a certain
observable on the collision energy and mass of one of the colliding nuclei. Location and size of the
critical vicinity can be estimated using an appropriate parametrization, while identification of the
phase transition will stem from the physical contents of the models, most adequately reproducing the
observed dependence, including the regime change. The advantage of the centrality criterion, based
on the azimuthal isotropy, — its independence, to a large extent, of the collision energy and of the
masses of the colliding nuclei, as well as of physics of the models, used for the method calibration, in
contrast to criteria, based on multiplicity.

Document number: 2018-2/893

Authors: A. N. Solomin

File size: 295.44 KB, updated 07.12.2018 14:42
• ## Local Magic Nuclei

In this study, a new kind of atomic nuclei has been discovered, local magic nuclei. A theory of these nuclei has been developed as well. The named nuclei have same observed peculiarities as traditional magic nuclei but, unlike the latter ones, have no magic isotopes or isotones and manifest themselves at new magic numbers. These nuclei are 52,54Ca, 68Ni, 96Zr, and 114Sn in the Z = 20 – 50 region. To describe the new phenomena, we introduce ‘miraculous pairs’ (N, Z) etc., where the underline denotes a number losing its magicity in another pair. It is shown that these nuclei arise due to the one-time appearance of gaps within shells. The shell evolution is driven by two-particle nucleon-nucleon interactions. The proton-neutron tensor force makes a decisive contribution. Diagrams of the nucleon orbit energies have been constructed. New magic numbers N = 32, 34 in nuclei Z ≈ 40 are predicted. An evolving shell scheme which develops the traditional Goeppert-Mayer – Jensen scheme has been constructed.

Document number: 2018-1/892

Authors: Igor Boboshin

File size: 2.49 MB, updated 09.02.2018 15:45
• ## FOUR-POINT FUNCTION IN GENERAL KINEMATICS THROUGH GEOMETRICAL SPLITTING AND REDUCTION

It is shown how the geometrical splitting of N-point Feynman diagrams can be used to
simplify the parametric integrals and reduce the number of variables in the occurring functions. As
an example, a calculation of the dimensionally-regulated one-loop four-point function in general
kinematics is presented.

Document number: 2017-1/891

Authors: Andrei I. Davydychev

File size: 281.68 KB, updated 17.11.2017 11:21
• ## GEOMETRICAL SPLITTING AND REDUCTION OF FEYNMAN DIAGRAMS

A geometrical approach to the calculation of N-point Feynman diagrams is reviewed. It is shown that the geometrical splitting yields useful connections between Feynman integrals with different momenta and masses. It is demonstrated how these results can be used to reduce the number of variables in the occurring functions.

Document number: 2016-2/890

Authors: Andrei I. Davydychev

File size: 309.12 KB, updated 13.05.2016 19:05
• ## ELECTRON SOURCE WITH HIGH BRIGHTNESS BEAM

This work describes the design and results of the calculation of electron source with high
brightness beam, which generate a sequence of 4 bunches of charge 1 nC each following with
repetition rate 50 Hz. RMS normalized transverse emittance of the bunch does not exceed 4 mm mrad,
rms duration of 3 ps, beam energy is adjustable in the range 35-50 MeV.

Document number: 2016-1/889

Authors: I.Yu. Vladimirov, B.S. Ishkhanov, L.Yu. Ovchinnikova, V.I. Shvedunov, D.S. Yurov

File size: 1.02 MB, updated 31.03.2016 15:38
• ## ION RANGES IN GASES AND NUCLEAR PHOTO EMULSION

This work presents a compilation, systematic and analysis of experimental data on ranges of He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, P, Ar, K, Br, Kr ions in gases (hydrogen, helium, argon, air), hydrocarbons (methane, benzene vapor) and nuclear photo emulsion, obtained in Laboratory of Atomic Collisions of Scobeltsyn Nuclear Physics Research Institute. The general features of range variation, depending on the energy and nuclear charge of ions and atomic number of media, are analyzed.

Document number: 2015-1/888

Authors: Yu.A.Belkova, Ya.A.Teplova

File size: 466.44 KB, updated 29.06.2015 16:23
• ## HIGGS-RADION SIMILARITY IN PRODUCTION PROCESSES INVOLVING OFF-SHELL FERMIONS

Document number: 2014-2/886

Authors: E. Boos, S. Keizerov, E. Rahmetov, K. Svirina

File size: 654.12 KB, updated 29.06.2015 15:34
• ## Canonical forms of the catastrophe theory for the two-Higgs-doublet model potential

The catastrophe theory describing sudden abrupt changes of a system has well-developed methods of investigation of the critical regimes. An application of these methods to the minimal supersymmetric standard model finite-temperature Higgs potential gives some interesting results. The nonlinear axes-conserving transformations are derived, which reduce the finite-temperature Higgs potential to canonical forms of the catastrophe theory.

Document number: 2014 – 3/887

Authors: M.N. Dubinin, E.Yu. Petrova

File size: 960.88 KB, updated 18.11.2014 12:58
• ## MIXING OF HYPERONIC STATES IN A NEUTRON-RICH LITHIUM HYPERNUCLEUS

$\Sigma^-$ hyperon component of the $^{10}_\Lambda$Li wave function is studied. The

$\Sigma^-$ admixture is vital for production of neutron-rich $\Lambda$ hypernuclei via

mesonic beams. We use a simplified shell model wave function for the $\Lambda$ channel

and calculate the $\Sigma^-$ admixture directly from coupled equations. Probability of the

$\Sigma^-$ admixture for realistic repulsive $\Sigma^-$-nucleus potentials is less by several

times than that for attractive potentials and does not exceed 0.1\%. We conclude that the

cross sections of the $^{10}\mbox{B}(\pi^-,K^+){}^{10}_\Lambda\mbox{Li}$ reaction

measured at KEK cannot be explained by production via $\Sigma^-$ admixture as a doorway

state.

Document number: 2014-1/885

Authors: D.E.Lanskoy, A.Sinyakova

File size: 433.65 KB, updated 13.01.2014 16:34
• ## SYSTEMATIC DISAGREEMENTS BETWEEN PARTIAL PHOTONEUTRON REACTIONS CROSS SECTIONS: NEW APPROACH TO ANALYSIS AND EVALUATION

There are well-known systematic disagreements in partial photoneutron reaction cross sections
data obtained in experiments with quasimonoenergetic annihilation photons using methods of

Document number: 2013–1/884

Authors: B.S.Ishkhanov, V.N.Orlin, N.N.Peskov, M.E.Stepanov, V.V.Varlamov

File size: 7.04 MB, updated 16.09.2013 15:13
• ## DEVELOPMENT OF RESTFUL-WEB SERVICES FOR REMOTE ACCESS TO DATA STORAGE RESOURCES FOR DISTRIBUTED SYSTEMS IN EARTH SCIENCES

RESTful-web services for remote access to data storage resources for distributed systems in
the Earth sciences are presented.

Document number: 2012-4/882

Authors: A.P.Kryukov, M.N.Zhizhin, FA.A.Poyda, D.Yu.Mishin, D.P.Medvedev, A.P.Demichev, D.S.Kokovin

File size: 1.09 MB, updated 23.11.2012 17:16
• ## PHOTONUCLEAR REACTIONS ON PALLADIUM ISOTOPES

Activation technique is used to measure the yields of photonuclear reactions on palladium
isotopes. Nutural palladium saple is used as a target.

Document number: 2012-5/883

Authors: K. A. Stopani

File size: 938.57 KB, updated 23.11.2012 17:16
• ## SIMULATION OF THE GAMMA-ACTIVATION EXPERIMENTS

The paper describes a software package designed to simulate an experiment to study
photonucleon reactions by measuring the residual activity.

Document number: 2012-3/881

Authors: B.S. Ishkhanov, S.Y. Troschiev

File size: 2.31 MB, updated 23.11.2012 17:16
• ## THE RESULTS OF SOLAR ENERGETIC PARTICLES FLOW MEASUREMENTS AND METHODS OF THEIR INTERPRETATION

We study the reliability and validity of the measurements of fluxes of protons and heavy
ions of solar energetic particles, made using different experimental techniques and methods for
describing th

Document number: 2011-11/875

Authors: D.G. Baranov, Y.F. Gagarin, V.A. Dergachev, R.A. Nymmik, M.I. Panasyuk

File size: 442.11 KB, updated 23.11.2012 17:16
• ## Equilibrium and preequilibrium charge states of ions passing through gaseous and solid targets

This work presents a compilation, systematic and analysis of experimental data on equilibrium and preequilibrium charge fractions and mean charges of ions, passing through gaseous media and thin foils

Document number: 2011-14/878

Authors: Yu.A.Belkova, Ya.A.Teplova

File size: 2.5 MB, updated 23.11.2012 17:16
• ## INVESTIGATION OF 181Ta PHOTODISINTEGRATION USING METHODS OF INDUCED ACTIVITY AND NEUTRON MULTIPLICITY SORTING - DATA RELIABILITY AND AUTHENTICITY

For Tantalum isotope \$^{181}Ta partial photoneutron reaction cross sections were obtained using not only methods of neutron multiplicity sorting but alternative method of induced activity also.

Document number: 2012-1/879

Authors: V.V.Varlamov, V.N.Orlin, N.N.Peskov, T.S.Polevich

File size: 1.15 MB, updated 23.11.2012 17:16
• ## STRUCTURE OF LOW-LYING NUCLEAR STATES NEAR THE CLOSED SHELL Z=50

Different factors having effect on the structure of the ground and low energy states of Cd, Sn and Te isotopes were investigated.

Document number: 2012-2/880

Authors: B.S. Ishkhanov, A.A. Kostyukov

File size: 1011.57 KB, updated 23.11.2012 17:16
• ## PRACTICAL APPLICATIONS OF ELECTRON ACCELERATORS

The review of major practical applications of electron accelerators is presented.

Document number: 2011-13/877

Authors: S. Alimov

File size: 441.58 KB, updated 23.11.2012 17:16
• ## HIERARCHICAL APPROACH TO FORECAST RECURRENT SOLAR WIND STREAMS

The article presents a hierarchical approach for the predicting of high-speed quasistationary solar wind streams.

Document number: 2011-10/874

Authors: Yu. S. Shugay, I. S. Veselovsky, D. B. Seaton, D. Berghmans

File size: 581.97 KB, updated 23.11.2012 17:16
• ## DYNAMICS OF THE OUTER RADIATION BELT OF THE EARTH DURING NOBEMBER 2009 BASED ON CORONAS-PHOTON AND METEOR-M &amp;#8470;1 SATELLITES MEASUREMENTS

According to the simultaneous experiments carried out in November, 2009 onboard a solar
observatory "CORONAS-PHOTON" and an artificial satellite &#171;the Meteor N &#8470;1&#187

Document number: 2011- 9/873

Authors: V.O. Barinova, A.V. Bogomolov, V.V. Kalegaev, I.N. Myagkova., M.I. Panasyuk, D.А. Paranukian, M.O. Ryazantzeva, I.A. Rubinstein, L.I. Starostin

File size: 562.15 KB, updated 23.11.2012 17:16