Preprints

  • 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

    The appearance of the radion field and of the radion, the corresponding lowest Kaluza-Klein (KK) mode, is a generic prediction of stabilized brane world models. In such models the radion plays the role of the dilaton, and its mass may be somewhat smaller than that of all the KK modes of other particles propagating in the multidimensional bulk. Due to its origin, the radion couples to the trace of the energy-momentum tensor of the Standard Model, the interaction Lagrangian of the radion and the Standard Model fermions being similar to that of the SM Higgs-fermion interactions except for additional terms, which come into play only in the case of off-shell fermions. In the present paper it is shown that all the contributions due to these additional terms to perturbative amplitudes of physical processes with emitted single radion and an arbitrary number of gauge bosons are canceled out for both massless and massive off-shell fermions. Thus in this case the additional fermion-radion terms in the interaction Lagrangian do not alter any production and decay properties of the radion compared to those of the Higgs boson.

    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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • MECHANISMS OF CHEMILUMINESCENCE IN FENTON REACTION

    A scheme of the processes in Fenton solution with various substances is offered, and the channels of light formation registered by the luminometer are analyzed.

    Document number: 2011-12/876

    Authors: N.A.Aristova, I.P.Ivanova, S.V.Trofimova, I.M.Piskarev, O.E.Burhina, O.O.Soshnikova

    File size: 902.08 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 №1 SATELLITES MEASUREMENTS

    According to the simultaneous experiments carried out in November, 2009 onboard a solar
    observatory "CORONAS-PHOTON" and an artificial satellite «the Meteor N №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
  • 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
  • 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
  • EXPERIMENTAL REQIREMENTS FOR THE CLAS12 SILICON VERTEX TRACKER

    The silicon vertex tracker is a key element of the detector complex upgrade for the CLAS12 experiment in Jefferson Lab Hall B.

    Document number: 2011-6/870

    Authors: B.S. Ishkhanov, S.V. Rogozhin

    File size: 587.04 KB, updated 23.11.2012 17:16
  • STATUS OF 1 MeV CONTINUOUS-WAVE LINEAR ELECTRON ACCELERATOR

    We describe development of industrial continuous-wave linear electron
    accelerator with beam energy 1 MeV and maximum beam current 25 mA.

    Document number: 2011-7/871

    Authors: A.S. Alimov, N.I. Pakhomov, V.I. Shvedunov, D.S. Yurov

    File size: 1 MB, updated 23.11.2012 17:16