bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultra-high energy cosmic rays from supermassive black holes: particle flux on the Earth and extragalactic diffuse emission
Authors: Uryson A V 
Published: November 2019

Abstract
Cosmic rays accelerated to ultra-high energies (E >4⋅1019 eV) in electric fields in accretion discs around supermassive black holes are discussed. Particle injection spectra are assumed to be harder than those formed in acceleration at shock fronts. It turned out that cosmic rays with injection spectra supposed contribute a little in the particle flux detected with ground-based arrays. But in the extragalactic space particles generate a noticeable flux of the diffuse gamma-ray emission compared with the data obtained with Fermi LAT instrument (onboard the Fermi space observatory). The intensity of neutrinos generated by cosmic rays propagating in the extragalactic space is also derived. The model intensity of cascade neutrinos is much lower than that of astrophysics neutrino. It is concluded that possibly supermassive black holes are cosmic ray sources which contribute slightly to the particle flux detected on the Earth, but these sources should be taken into account analyzing components of extragalactic diffuse gamma-ray emission.
Comparing EAS registered with PRISMA-32 array and CWC NEVOD
Authors: Gromushkin D M , Bogdanov F A , Bulan A V , Yurin K O 
Published: November 2019

Abstract
Results of comparing events detected with two detectors of the Experimental complex NEVOD: PRISMA-32 array and Cherenkov water calorimeter (CWC) NEVOD – are presented. The PRISMA-32 is an array for simultaneous registration of the EAS electron-photon and neutron components. It consists of 32 en-detectors deployed over the area of about 500 m2, along the perimeter of the CWC NEVOD. The CWC NEVOD is a detector of a calorimetric type with a volume of 2000 cubic meters in which the registration system of 91 quasispherical modules (546 FEU-200 photomultipliers) is placed. CWC provides measurement of the intensity of Cherenkov radiation from any direction with practically the same efficiency.
Influence of magnetic field and density of environment on collimation of laboratory jet
Authors: Shatalov N A , Chechetkin V M , Kalashnikov I Yu , Krauz V I 
Published: November 2019

Abstract
In this work a numerical simulation of the propagation of a plasma bunch in the experimental plasma focus facility was carried out to determine the parameters influencing on the value of an opening angle. Both the experiment and the numerical simulations are supposed to have the same dimensionless parameters as astrophysical jets. The dependence of the jet opening angle on the magnitude of the magnetic field and the ratio of the densities of the jet itself and the surrounding plasma was investigated. Due to the obtained results, it became possible to determine the dominant factor responsible for jet collimation.
Radiative transitions of electrons between Landau levels in a moderately strong magnetic field
Authors: Kuznetsov A V , Zabrodina O I 
Published: November 2019

Abstract
We investigate the processes of radiative electron transitions between Landau levels in a moderately strong magnetic field. Under such conditions, it is necessary to take into account transitions in which both the initial and final electrons can be in states corresponding to arbitrary Landau levels. The results obtained can be used in calculating the efficiency of electron-positron plasma generation under the conditions of a Kerr black hole accretion disk.
Cosmic muons measurements in the DANSS experiment
Authors: Samigullin Eduard 
Published: November 2019

Abstract
DANSS is a highly segmented detector, which contains 2500 one meter long plastic scintillator strips. The DANSS detector is placed under an industrial reactor of the Kalininskaya Nuclear Power Plant. The distance to the core is varied on-line from 10.7 to 12.7 m, and the primary task of the experiment is a search for short-distance neutrino oscillations. This work contains results of the cosmic muons study based on the data obtained with the DANSS detector. In order to achieve these results, the specific algorithm of muon track reconstruction with 97 % efficiency was developed. We also present some preliminary results on the annual variability in the flux of cosmic muons, an evaluation of the < Ethrcosθ > parameter and the correlation coefficient.
A cluster approach to the analysis of experimental data of the NEVOD-EAS shower array
Authors: Shulzhenko I A , Ardashev V A , Chiavassa A , Dobrynchuk L V , Gromushkin D M , Likiy O I 
Published: November 2019

Abstract
The NEVOD-EAS array for the detection of extensive air showers in the energy range 1015–1017 eV is being created in MEPhI on the basis of the Experimental complex NEVOD. The array will allow independent estimations of the size, axis position and arrival direction of EAS registered by the detectors of the experimental complex. The NEVOD-EAS registering system is organized in a cluster principle, and data analysis is performed using a newly developed cluster approach. The features of this approach to the NEVOD-EAS experimental data analysis are discussed.
SMASH model and atmospheric neutrino mass splitting
Authors: Das C.R. , Huitu Katri , Kärkkäinen Timo 
Published: November 2019

Abstract
Five fundamental problems - neutrino mass, baryogenesis, dark matter, inflation, strong CP problem - are solved at one stroke in a model, dubbed as “SM-A-S-H” (Standard Model-Axion-Seesaw-Higgs portal inflation) by Andreas Ringwald et. al. The Standard Model (SM) particle content is extended by three right-handed SM-singlet neutrinos Ni
, a vector-like color triplet quark Q, a complex SM-singlet scalar field σ that stabilises the Higgs potential, all of them being charged under Peccei-Quinn (PQ) U (1) symmetry, the vacuum expectation value vσ
∼ 1011 GeV breaks the lepton number and the Peccei-Quinn symmetry simultaneously. We found that numerically SMASH model not only solves five fundamental problems but also the sixth problem “Vacuum Metastability” through the extended scalar sector and can predict approximately correct atmospheric neutrino mass splitting around 0.05 eV and the solar neutrino mass splitting around 0.009 eV.
Description of processes passing at finite space-time intervals in the framework of quantum field theory
Authors: Egorov V O , Volobuev I P 
Published: November 2019

Abstract
We consider a novel quantum field-theoretical approach to the description of processes passing at finite space-time intervals based on the Feynman diagram technique in the coordinate representation. The most know phenomena of this type are neutrino and neutral kaon oscillations. The experimental setting of these processes demands that the rules of passing to the momentum representation in the Feynman diagram technique be adjusted in accordance with it, which leads to a modification of the Feynman propagator in the momentum representation. The approach does not make use of wave packets: both initial and final particle states are described by plane waves, which simplifies the calculations considerably. We demonstrate the validity of the formalism by applying it to describing the decay of an unstable particle and neutrino oscillations. It is shown that the considered approach correctly reproduces the known results.
Reconnection of magnetic fields in neutron stars driven by the electron mass term in the triangle anomaly
Authors: Dvornikov Maxim , Semikoz Victor B. 
Published: November 2019

Abstract
The Adler-Bell-Jackiw anomaly for massive particles is studied in an external magnetic field. The contributions of the mean spin and the pseudoscalar are accounted for in the quasiclassical approximation. The equation for the evolution of the magnetic helicity with the new quantum corrections is derived. We show that the quantum contribution to the helicity evolution can overcome the classical one in the dense degenerate matter which can be present in the core of a neutron star. The application of the obtained results for the interpretation of magnetar bursts are discussed.
Kinks in the relativistic model with logarithmic nonlinearity
Authors: Belendryasova E , Gani V A , Zloshchastiev K G 
Published: November 2019

Abstract
We study the properties of a relativistic model with logarithmic nonlinearity. We show that such model allows two types of solutions: topologically trivial (gaussons) and topologically non-trivial (kinks), depending on a sign of the nonlinear coupling. We focus primarily on the kinks' case and study their scattering properties. For the kink-antikink scattering, we have found a critical value of the initial velocity, which separates two different scenarios of scattering. For the initial velocities below this critical value, the kinks form a bound state, which then decays slowly. If the initial velocities are above the critical value, the kinks collide, bounce and eventually escape to infinities. During this process, the higher initial velocity is, the greater is the elasticity of the collision. We also study excitation spectrum of the kink solution.
Footprints of Non-Inflationary Cosmology in Programs OLIMPIA and Synthesis of Heavy Elements
Authors: Avetissian Ara K 
Published: November 2019

Abstract
In this work we are going to apply one of main ideas of “Non-Inflationary Cosmology”, established by author as an alternative theory of cosmology – the analogue of the phenomenon of 6-photonic capture of Higgs bosons in Bose-Einstein condensate in the early Universe – as a possible scenario for the implementation and further possible development of two Russian programs “OLIMPIA” and “Synthesis of heavy elements”. Offered by us and thoroughly discussed phenomenon of “the cold trapping of baryons within 6-photonic potential well” may be additional or even possible alternative mechanism to the well-known “mechanism of cold synthesis of nuclei”.
Graviton-to-photon conversion effect in magnetized relativistic plasma
Authors: Postnov K A , Simkin I V 
Published: November 2019

Abstract
The graviton-to-photon conversion effect in a magnetized relativistic lepton plasma is considered. This effect can be important for the possible generation of electromagnetic radiation accompanying coalescence of relativistic compact neutron star – black hole binaries. The relativistic electron-positron plasma can be generated near the surface of a rotating magnetized neutron star (a radio pulsar). The formation of a relativistic compact binary containing a pulsar and a black hole is predicted by the evolution of massive binary stars. Prior to the coalescence of such a binary due to gravitational wave (GW) emission, a fraction of the GW power can be converted in the plasma outflow into a low-frequency electromagnetic (EM) waves, which can lead to additional radio power prior to the coalescence. Using the graviton- to-photon conversion mechanism in an external magnetic field, we calculate the fraction of GW power converted into the EM radiation in the relativistic plasma. The result is found to depend on the neutron star spin period P, plasma Lorentz factor γ and the cascade multiplicity λ, but independent of the neutron star magnetic field: K ≃ 10−35(P/1 s)2(γ/105)2(λ/105)−2. The possibility of the detection of the non-thermal EM counterparts from neutron star – black hole coalescences in the forthcoming GW observations by aLIGO/Virgo detectors is briefly discussed.
Search for events in the LVD detector coinciding with gravitational signals from the collapse of close binary systems
Authors: Agafonova N Yu , Ashikhmin V V , Dobrynina E A , Enikeev R , Malgin A S , Ryazhskaya O G , Shaliryanova I R , Yakushev V F 
Published: November 2019

Abstract
The results of the search for events detected by the Large Volume Detector coinciding with the gravitational signals from the GW150914, GW151226, GW170104, GW170608, GW170814 and GW170817 are presented.
On Firewalls in quantum-corrected General Relativity
Authors: Nurmagambetov A J , Park I Y 
Published: November 2019

Abstract
We consider the information loss paradox at different angles, from the standard semi-classical approximation of General Relativity to the recently proposed scenarios of black holes evolution caused by effects of gravity quantization. Focusing on the Firewall proposal, we study the loop effects on the geometry and boundary conditions in black hole spacetimes and analyze the energy measured by an infalling observer near their horizons. As a result we obtain a trans-Planckian energy transition for the time-dependent black hole solution on the quantum-induced AdS background, the importance of which for the black hole (in)formation is discussed.
Magnetic field contribution to black-hole-hedgehog’s solution in GraviWeak unification
Authors: Das C.R. , Laperashvili L.V. , Nielsen H.B. , Sidharth B.G. 
Published: November 2019

Abstract
In the framework of Multiple Point Principle (MPP), where the existence of the two degenerate vacua of the Universe, the first, ElectroWeak vacuum with ≈ 246 GeV (“true vacuum”), and the second at Planck scale ∼ 1018 GeV (“false vacuum”); we investigated the gravitational black-hole-hedgehog's solution with magnetic field contribution in the GraviWeak unification model described by f(R) gravity. We have considered the phase transition from the “false vacuum” to the “true vacuum” and confirmed the stability of the ElectroWeak vacuum. The “false vacuum” defect configurations for the black-hole-hedgehog have given a global monopole and this monopole has been “swallowed” by the black-hole with core mass M

BH
≈ 3.65 × 1018 GeV and radius δ ≈ 6 × 10−21 GeV−1. The horizon radius of the black-hole-hedgehog is around rh
≈ 1.14δ.
Gravitational Hertz experiment in dielectrics, excited by intense laser pulses
Authors: Gorelik V S 
Published: November 2019

Abstract
The possibility of generating and detection of high-frequency gravitational waves based on parametric optical processes in dielectric media excited by intense laser emission is analyzed. The theory predicts the feasibility of the Hertz gravitational laboratory experiment in dielectric media at the presence of strong constant magnetic field with illumination of this media by intense ultra short laser pulses of visible or ultraviolet ranges. Parametric conversion of ultra short intense laser pulses with frequency ω0 to a gravitational wave with frequency ωg=2ω0 and reconversion process of gravitational radiation to optical radiation at resonance condition for some dielectrics and photonic structures are predicted
Studying the possibility of FSR suppression in DM decay in dependence of the mass of intermediate particle and vertex
Authors: Solovyov M L , Belotsky K M , Kamaletdinov A H , Esipova E A 
Published: November 2019

Abstract
In this proceedings we study possibility of final state radiation (FSR) in the process of dark matter (DM) decay/annihilation. Two possibilities are considered independently: one-cascade annihilation through intermediate particle (a), and parameterized interaction vertex. The mass of a and vertex parameters are used to try to suppression FSR. Suppression is necessary to avoid limit from cosmic gamma-radiation preventing DM explanation of positron anomaly in CR. Finally, it may seem that a little suppression can be reached by fine-tuning the mass of a, and vertex parameters do not help to do it in the considered cases.
Incoherent X-ray diffraction radiation for noninvasive diagnostics of transverse size of ultrarelativistic beams
Authors: Tishchenko A A , Sergeeva D Yu , Strikhanov M N 
Published: November 2019

Abstract
Polarization radiation, which includes diffraction radiation, transition radiation, Smith-Purcell radiation, and others, can be a good instrument for beam diagnostics. All information about the beam size is contained in the so-called form-factor of the beam. The form-factor represents the sum of two parts corresponding to the coherent and incoherent radiation. Contrary to the general opinion the incoherent part does not always equal unity. In this report we give theoretical description of the incoherent part of the form-factor both for Gaussian and uniform distribution of the ultrarelativistic particles in the bunch. We show that the incoherent form-factor depends on the transverse size of the beam, and discuss the new opportunities for non-invasive diagnostics of ultrarelativistic electron beams.
Fabrication of reactor target from enriched 50Cr for artificial neutrino source
Authors: Kozlova J P , Veretenkin E P , Gavrin V N , Danshin S N , Ibragimova T V , Komarov B A 
Published: November 2019

Abstract
The fabrication of the enriched 50Cr target for the artificial 51Cr neutrino source with activity > 3 MCi for the experiment BEST is presented. The processes of obtaining a target in the form of disks with a thickness of 4 mm and a diameter of 84 and 88 mm required to achieve the necessary activity using the reactor SM-3 are considered, including: enrichment of natural chromium in the form of oxyfluoride by gas centrifugation, electrolytic reduction and refining of metallic chromium, as well as the formation of chromium disks by spark plasma sintering.
Status of UCN supersource at WWR-M reactor
Authors: Serebrov A P , Lyamkin V A , Fomin A K , Koptyuhov A O , Prudnikov D V , Samodurov O Yu , Ilatovskiy V A , Keshishev K O , Boldarev S T 
Published: November 2019

Abstract
The WWR-M reactor at NRC «Kurchatov Institute» - PNPI is going to be equipped with high-density ultracold neutron source. Method of UCN production is based on their accumulation in the superfluid helium at 1.2 K temperature. Thus, the source will provide the UCN density at EDM spectrometer equals to ρ = 1.3⋅104 cm−3 which is 2 order magnitude greater than the output density of existing UCN source in the world. An extensive program of fundamental researches such as measuring of neutron lifetime and searching of neutron-antineutron oscillation is planned. In addition, CN and VCN beams are going to be equipped with condensed matter physics experimental setups. The design of the UCN source has been completed, complex tests at full-scale model showed that is possible to maintain superfluid helium under reactor heat load; calculations of an UCN source passive shielding, which ensures source safe operation, is completed. At the moment the process of UCN source manufacturing is taking place.
Hadronic shower properties in highly granular calorimeters with different absorbers
Authors: Chadeeva Marina 
Published: November 2019

Abstract
The CALICE collaboration develops and tests highly granular calorimeter prototypes for future collider experiments. The scintillator-SiPM-based prototypes of hadron calorimeters with steel and tungsten absorbers were exposed to test beams from the CERN SPS in 2007-2011. The paper presents a comparison of hadronic shower properties observed in the test beam data. The application of software compensation technique is discussed for the energy reconstruction in calorimeters with different level of compensation. It was observed from the experimental data that the achieved improvement of relative energy resolution is about 20% for the noncompensating calorimeter, while it is less than 5% for the compensating one.
Compact neutron generators for the calibration of low background experiments
Authors: Chepurnov AS , Gromov MB , Ionidi V Yu , Kaplii A A , Kirsanov MA , Klenin A A , Kolesnikov D A , Kubankin A S , Maslenkina A Yu , Oleinik A N , Selivanova D A , Shchagin A V 
Published: November 2019

Abstract
In the coming years, the compact monoenergetic neutron generators (CNG) producing up to 104 n/s may become an alternative to the standard neutron sources based on radioactive isotopes for the calibrations of neutrino and dark matter detectors. Such neutron generators have a typical size of about several centimetres, they may be manufactured using low-background materials and may require only low voltage power supply for operation. We discuss the advantages and disadvantages of two main types of the compact neutron generators, namely a pyroelectric neutron source and a high voltage neutron generator. Also the results of the technical analysis of the possibilities to apply such sources for the calibration of low-background experiments are given, the variant of the internal device design is shown and the full-size compact neutron generator prototype are presented.
Compact x-ray spectrometer based on thermoluminescent detectors
Authors: Grigoryeva I G , Khil’ko M V , Salakhutdinov G Kh 
Published: November 2019

Abstract
A small-sized pulsed x-ray spectrometer was designed and developed. The spectrometer is designed to study pulsed x-rays in the energy range of quanta 1-30 keV. The spectrometer is an assembly of thermoluminescent LiF detectors arranged one after another. Thermoluminescent detectors record x-ray radiation and are used as filters for selection of x-ray radiation in the spectrum. Thermoluminescent LiF detectors are immune to electromagnetic interference, and their response is linear in a wide dynamic range of the absorbed radiation dose (from 20 mSv to 10 Sv). Calibration measurements and test tests have shown good performance and reliability of the small-sized spectrometer.
Modernization of the pulse shape discrimination method for neutron and gamma quanta in scintillation detector
Authors: Chepurnov A S , Ivanenko M I , Kirsanov M A , Klimanov S G , Kubankin A S 
Published: November 2019

Abstract
In this paper, we investigated the efficiency of several known and new methods of digital pulse shape discrimination for neutrons and gamma quanta. Experimental data were obtained on a setup consists of a Pu-Be neutron source, organic p-terphenyl scintillation detector and 14 bits, 500 MHz sampling rate flash-ADC with capability to store and upload to the host computer long waveforms for further analysis. A comparison is made in between the results of using traditional and new methods for calculating the signal separation efficiency of Figure of Merit (FOM). The best known from the literature value of the efficiency of neutron and gamma quanta discrimination for the Pu-Be source is FOM = 1.5. We obtained the separation efficiency FOM = 1.77 in the scintillation detector with the p-terphenyl crystal, by a new method. Note also that for the known liquid scintillator BC-501A FOM≈1. A new method of scintillation detector pulse shape discrimination from neutrons and gamma quanta is used to detect the neutron yield from compact neutron generator that is created on the basis of carbon nanotubes.
Calibration and Performance of the ATLAS Tile Calorimeter
Authors: Petukhova Krystsina 
Published: November 2019

Abstract
The Tile Calorimeter (TileCal) of the ATLAS experiment at the LHC is the central hadronic calorimeter designed for the reconstruction of hadrons, jets, tau-particles and missing transverse energy. This sampling calorimeter uses steel plates as absorber and scintillating tiles as active medium. The light produced by the passage of charged particles is transmitted by wavelength shifting fibers to photomultiplier tubes (PMTs). The readout is segmented into about 5000 cells, each of them being read out by two PMTs in parallel. The TileCal calibration system comprises Cesium radioactive sources, laser, charge injection elements, and an integrator based readout system. Combined information from all systems allows to monitor and to equalize the calorimeter response at each stage of the signal evolution, from scintillation light to digitization. The performance of the calorimeter has been established with cosmic ray muons and the large sample of the proton-proton collisions. The response of high momentum isolated muons is used to study the energy response at the electromagnetic scale, isolated hadrons are used as a probe of the hadronic response. The calorimeter time resolution is studied with multi-jet events. A description of the different TileCal calibration systems and the results on the calorimeter performance during the LHC Run 2 will be presented.