bluuebunny/crossref_metadata_2025_split huggingface dataset:
Magnetoresistive properties of exchange biased spin valve caused by helical magnetic ordering in dysprosium layer
Authors: Ustinov V V , Milyaev M A , Zavornitsyn R S , Krinitsina T P , Proglyado V V , Naumova L I 
Published: November 2019

Abstract
Spin valves containing CoFe/Dy/CoFe nanostructure as a pinned layer were prepared by magnetron sputtering. Investigations of microstructure and magnetoresistive properties were performed. The magnetoresistive properties of the spin valve were used as the instrument to study the changes in magnetic state of the dysprosium layer. The existence of noncollinear magnetic ordering in dysprosium polycrystalline nanolayer was observed. The angle between the magnetic moments in a top and bottom part of the dysprosium layer was estimated.
Strong indication of true quaternary fission of 252Cf (sf)
Authors: Pyatkov Yu V , Kamanin D V , Tomas A V , Alexandrov A A , Alexandrova I A , Goryainova Z I , Malaza V , Kuznetsova E A , Strekalovsky A O , Strekalovsky O V , Zhuchko V E 
Published: November 2019

Abstract
In our previous publications we discussed possible physical scenario standing behind rectangular–like structures in the fission fragments mass-correlation distributions from 252Cf(sf). The rectangle is bounded by the known magic nuclei such as 68Ni, 84Se and others. The fission events aggregated in the rectangle show extremely low total kinetic energies. Previously only decay mode with two Ni clusters in the exit channel was discussed. A more complete analysis is presented which gives additional arguments in favour of true quaternary fission of 252Cf (sf).
Investigation of the interaction of ion beams and X-ray quanta with deuterated crystal structures at the HELIS facility
Authors: Dalkarov O D , Negodaev M A , Rusetskii A S , Chepurnov A S , Kirsanov M A , Kishin I A , Kubankin A S , Kudryashov I A , Selivanova D A 
Published: November 2019

Abstract
The results of studies of the interaction of ion beams and X-ray quanta with deuterated crystal structures at the HELIS facility (LPI) are presented. Results on research of DD-reactions in deuterated crystal structures at deuteron energies 10 - 25 keV show significant enhancement effect. It is shown that the effect of the beams of ions Ne+ and H+ at energies in the range of 10 - 25 keV and a beam of X-radiation of 20 - 30 keV for deuterated target leads to stimulation of DD-reaction. For the target of CVD-diamond it is showed that the orientation of the sample with respect to the deuteron beam affects the neutron yield. Targets (deuterated CVD diamond, palladium, zirconium and titanium) were irradiated with both ion beams and X-ray quanta using an X-ray tube with an energy of up to 30 keV. Analysis of X-ray fluorescence spectra from deuterated targets of CVD diamond and palladium revealed "additional" peaks that are not identified by any of the characteristic radiation lines. Their appearance cannot be connected with any known element, as well as with diffraction processes.
Total reaction cross sections of neutron-rich light nuclei measured by the COMBAS fragment-separator
Authors: Erdemchimeg B , Artukh A G , Davaa S , Hue B M , Isataev T , Klygin S A , Kononenko G A , Khuukhenkhuu G , Lukyanov S M , Mikhailova T I , Maslov V A , Mendibaev K , Sereda Yu M , Penionzhkevich Yu E , Vorontzov A N 
Published: November 2019

Abstract
Preliminary results of measurements of the total reaction cross sections σR for nuclei 4He, 6He, 8He, 7Li, 8Li, 9Li, 1Li, 11Be, 9Be, 10Be, 11Be, 12Be, 8B, 10B, 11B and 12B nuclei at energy range (10-50) A MeV with 28Si target is presented. The secondary beams of light nuclei were produced by bombardment of the 15N (50 A MeV) primary beam on Be target and separated by COMBAS fragment-separator. In dispersive focal plane a horizontal slit defined the momentum acceptance as 1% and a wedge degrader of 600 μm Al was installed. The Bρ of the second section of the fragment-separator was adjusted for measurements in energy range (10-45) A MeV. The strong absorption model reproduces the A-dependence of ψR, but not the detailed structure. We are comparing our experimental data with predictions of microscopic (dashed line) and strong absorption model, Glauber multiple scattering theory and preliminary results are obtained.
Neutron lifetime: experimental problem or anomaly?
Authors: Serebrov A. P. 
Published: November 2019

Abstract
The review of experimental measurements of neutron lifetime is presented. Latest measurements with gravitational trap (PNPI NRC KI) and magnetic trap (LANL, USA) confirmed the result obtained by PNPI group in 2005. The results of measurements performed using UCN storing method are in good agreement; however there is a significant discrepancy at 3.5σ (1% of decay probability) level with beam method experiment. That discrepancy is mentioned in scientific literature as "neutron anomaly". The possible sources of the discrepancy are discussed.
Dissociation of6,7Li nuclei in nuclear photographic emulsion
Authors: Mekhimar M , Ahamed Y , El-Sharkawy S , Hegab M K , Osman O M 
Published: November 2019

AbstractDiffraction dissociation process of6Li at incident momentum 4.5 AGeV/c and7Li at incident momentum 3 AGeV/c, provided by the JINR Synchrophastron, were studied using the photographic emulsion technique. The two stable isotopes of6Li and7Li were treated as two weakly-bound systems composed of (4He+d) and (4He+t) cluster configurations, respectively. Along the track double scanning method was carried out in order to search for6,7Li interactions in emulsion( Em). For6Li-Em and7Li-Em about 1050 and 1015 events were recorded with mean free path 14.5±0.5 cm and 15.1±0.6 cm respectively. The measured angular distributions of the outgoing fragments were compared with that calculated theoretically and good agreement between the experimental and theoretical values is obtained. This agreement supported the presence of6,7Li nuclei in a cluster mode at high energy reactions.
Observation of cluster structure of fission fragments
Authors: Strekalovsky A O , Pyatkov Yu V , Kamanin D V , Alexandrov A A , Alexandrova I A , Goryainova Z I , Malaza V , Kuznetsova E A , Strekalovsky O V , Zhuchko V E 
Published: November 2019

AbstractThe manifestation of a new original effect appearing at crossing of the metal foils by fission fragments is reported. The effect takes place predominantly at front impacts. The obtained results suggest that a fragment from conventional binary fission is borne in shape-isomer state which looks like a di-nuclear system with magic core.
Clusterization in heavy cold nuclei
Authors: Pyatkov Yu V , Kamanin D V 
Published: November 2019

AbstractA cluster is broadly understood to be an object which keeps its identity in a larger scale system. Manifestations of clustering can be revealed in very different size systems from exotic nuclei to galaxies. In our work we search for cluster effects in low energy fission of heavy nuclei. In the series of experiments carried out with the spectrometers based both on the gas filled (FOBOS spectrometer and its modifications) detectors and mosaics of solid-state detectors (setups at the beams of alpha-particles and deuterons, COMETA spectrometer) using the “missing mass” method and with the direct detection of three decay partners, we have discovered a new type of the ternary decay of heavy nuclei dubbed by us “collinear cluster tri-partition (CCT)”. The most interesting aspects of both the original methodic used and the physics of the effect observed are discussed in the presented report.
Spectroscopy of 7He in the reactions of stopped pion absorption by 12,14C nuclei
Authors: Chernyshev B , Gurov Yu , Lapushkin S , Karpukhin V , Sandukovsky V , Schurenkova T 
Published: November 2019

Abstract
The production of the 7He states was studied in the reactions of stopped pion absorption by carbon isotopes: 12C(π−, p4He)7He, 12C(π−, d3He)7He and 14C(π−, t4He)7He. Measurements were performed using two-arm multilayer semiconductor spectrometer. The ground and excited states were observed in all three reactions. Narrow (Γ < 2 M∍B) state with the high excitation energy ≈ 16 MeV was observed in the 14C(π−, t4He)7He reaction.
Anisotropic flow measured in Pb-Pb collisions with the NA49 and NA61/SHINE experiments at CERN SPS
Authors: Golosov Oleg , Klochkov Viktor , Kashirin Evgeny , Selyuzhenkov Ilya 
Published: November 2019

Abstract
Results are presented for directed flow v
1 of negatively charged pions measured relative to the spectator plane in Pb+Pb collisions at the beam energy 40A GeV recorded by the NA49 experiment at CERN. The measurements were performed as a function of rapidity and transverse momentum in two classes of collision centrality. The projectile spectator symmetry plane is estimated using the transverse segmentation of the forward hadron calorimeters. Analysis details related to event selection and particle identification are provided along with a description of the procedure used to apply corrections for the limited detection efficiency. Additionally a systematic study of effects due to detector non-uniformity on pion directed flow measurement is presented.
QCD phase diagram with chiral imbalance in NJL model: duality and lattice QCD results
Authors: Khunjua T G , Klimenko K G , Zhokhov Roman N 
Published: November 2019

Abstract
In addition to temperature and baryon chemical potential there exist other parameters that are essential in the real quark matter. One of them is isospin asymmetry, which does exist in nature, for example, in the compact stars or in heavy ion collisions. Chiral imbalance, the difference between left- and right-handed quarks, is another phenomenon that could occur in quark matter. We have shown that lattice QCD results support the existence of the approximate duality (found in effective models) in real QCD. The rise of pseudo-critical temperature with increase of chiral chemical potential μ
5 (the much debated effect recently, a lot of studies on this contradict each other) has been established in terms of just duality notion, hence reinforce confidence in this result and put it on the considerably more solid ground.
Search for critical behavior of strongly interacting matter in the NA61/SHINE experiment
Authors: Prokhorova Daria 
Published: November 2019

Abstract
NA61/SHINE is a fixed-target experiment at CERN SPS which studies strongly interacting matter. The search for experimental signatures of the critical point is performed via a comprehensive two-dimensional scan of the phase diagram of strongly interacting matter by changing beam momenta (13A - 150A GeV/c) and the size of colliding systems (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb). Recent NA61/SHINE results on the search for critical behavior search in two-particle correlations, multiplicity and transverse momentum fluctuations, femtoscopy studies and intermittency analysis were presented.
NA61/SHINE experiment at CERN SPS: Recent results, current status and perspectives
Authors: Brzychczyk Janusz 
Published: November 2019

Abstract
The NA61/SHINE experiment at the CERN SPS studies hadron production properties in hadron-nucleus and nucleus-nucleus collisions. Recent results from p+p, Be+Be and Ar+Sc interactions provide new data on the system size and energy dependence of hadron multiplicities, spectra and fluctuations. In particular, they indicate a threshold for formation of large clusters interpreted as the onset of fireball. A scaled-factorial-moment analysis of the proton density fluctuations in Ar+Sc collisions at 150A GeV/c shows an intermittency signal, which may be a first trace of critical behavior. The main objective of the future NA61/SHINE program is to obtain high-precision data on charm hadron production. This new program is planed to start in 2021, after the Long Shutdown 2 of the CERN accelerators. It requires significant upgrades of the NA61/SHINE detectors in order to increase the data readout rate tenfold.
Coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions with ALICE at the LHC
Authors: Lavicka Roman 
Published: November 2019

Abstract
There are several predictions for the behaviour of the gluon distribution in nuclei at small Bjorken-x and experimental data are needed to choose among them. This is achieved by measuring the cross section of processes specially sensitive to this parton distribution.
The high flux of photons from lead ions at the LHC allows us to study photon-induced reactions in ultra-peripheral collisions of Pb–Pb nuclei, in particular of those producing a J/ψ meson exclusively. The study of these collisions, where projectiles do not overlap, provides information about the initial state of nuclei.
The newest ALICE results on vector meson photoproduction are presented. The increased statistics and higher collision energy of

s

N
N

=
5.02

TeV

of Run 2 allow us to put new constraints on available models.
Femtoscopic scales of particle-emitting source in small and large systems
Authors: Semenova V K , Khyzhniak E V , Nigmatkulov G A 
Published: November 2019

Abstract
The femtoscopy technique allows one to measure the spatial and temporal scales of the particle-emitting source produced in high-energy collisions. In non-central ultra-relativistic heavy-ion collisions, emitting source may be tilted in the reaction plane. The orientation of freeze-out distributions is interesting because it provides complementary information about quark-gluon matter properties. In the experiment, the tilt can be extracted by measuring femtoscopic radii as a function of the pair angle with respect to the first-order event plane.
In this talk, we will present results of azimuthally sensitive femtoscopic analysis of Au+Au and Cu+Au collisions at

s

N
N

=
200

GeV

. We will also present the transverse momentum and multiplicity dependence of identical pion femtoscopic radii from d+Au, 3He+Au collisions at

s

N
N

=
200

GeV

. All data was obtained from the UrQMD model.
Heavy Flavor Physics at ATLAS and CMS
Authors: Chistov Ruslan 
Published: November 2019

Abstract
In this talk I report recent results on heavy flavor physics from ATLAS and CMS. It includes two topics: spectroscopy of open or hidden beauty hadrons and studies of rare B decays of the type b → sμ+μ−
. The former one is aimed to collect new information on the properties of beauty hadrons which helps to gain better understanding of QCD. And the latter one provides a good opportunity of searching for New Physics, the effects beyond the Standard Model. The discussed results were obtained with the Run 1 data

(

s

=
8

TeV
)

or Run 2 data

(

s

=
13

TeV
)

.
Hadronic production of double charmed baryons with excited diquark
Authors: Berezhnoy A V , Belov I N , Likhoded A K 
Published: November 2019

Abstract
We discuss the prospects of the observation of double heavy baryons Ξ
cc
, Ω
cc
with excited diquark (S and P excitations) in experiments at LHC. P-wave excitations of a diquark in double charmed baryons are supposed to be quite narrow since their decay into the ground state is highly suppressed. Relative yields of S-wave and P-wave excitations have been estimated within pQCD for the LHCb kinematics.
Reconstruction techniques in Supersymmetry searches with the ATLAS detector
Authors: Vermeulen Ambrosius 
Published: November 2019

Abstract
Many supersymmetric scenarios of the Standard Model feature final states which are difficult for standard particle reconstruction. The production of massive sparticles can for example lead to the production of boosted quarks or vector bosons. At the same time, transitions between nearly mass-degenerate sparticles challenges the standard event reconstruction because of the presence of very soft leptons or jets. This contribution to the conference proceedings will review the application of innovative reconstruction techniques to supersymmetry searches in ATLAS.
On separate chemical freeze-outs of hadrons and light (anti)nuclei in high energy nuclear collisions
Authors: Bugaev K. A. , Grinyuk B. E. , Ivanytskyi A. I. , Sagun V. V. , Savchenko D. O. , Zinovjev G. M. , Nikonov E. G. , Bravina L. V. , Zabrodin E. E. , Blaschke D. B. , Kabana S. , Taranenko A. V. 
Published: November 2019

Abstract
The multiplicities of light (anti)nuclei were measured recently by the ALICE collaboration in Pb+Pb collisions at the center-of-mass collision energy

s

N
N

=
2.76

TeV

. Surprisingly, the hadron resonance gas model is able to perfectly describe their multiplicities under various assumptions. For instance, one can consider the (anti)nuclei with a vanishing hard-core radius (as the point-like particles) or with the hard-core radius of proton, but the fit quality is the same for these assumptions. In this paper we assume the hard-core radius of nuclei consisting of A baryons or antibaryons to follow the simple law

R
(
A
)
=

R
b

(
A
)

1
3

, where Rb
is the hard-core radius of nucleon. To implement such a relation into the hadron resonance gas model we employ the induced surface tension concept and analyze the hadronic and (anti)nuclei multiplicities measured by the ALICE collaboration. The hadron resonance gas model with the induced surface tension allows us to verify different scenarios of chemical freeze-out of (anti)nuclei. It is shown that the most successful description of hadrons can be achieved at the chemical freeze-out temperature Th
= 150 MeV, while the one for all (anti)nuclei is TA
= 168.5 MeV. Possible explanations of this high temperature of (anti)nuclei chemical freeze-out are discussed.
Searches for electroweak production of higgsino with ATLAS
Authors: Todome Kazuki 
Published: November 2019

Abstract
Fine-tuning arguments suggest the mass of the supersymmetric partner of the Higgs boson, the Higgsino, is not too far from the weak scale. In most beyond standard model scenarios the Higgsinos are almost mass degenerate, and the search for Higgsinos represents an experimental challenge due to the near mass-degeneracy resulting in soft decay products, and the low production cross section. This proceeding presents recent ATLAS results of analyses explicitly targeting the Higgsino with a variety of experimental techniques.
Prospect for top quark FCNC searches at the FCC-hh
Authors: Mandrik Petr 
Published: November 2019

Abstract
FCC-hh is a proposed future energy-frontier hadron collider, which goal is to provide high luminosity proton collisions at a centre-of-mass energy of 100 TeV. The FCC-hh has an extremely rich physics program ranging from standard model (SM) measurements to direct searches for physics beyond the standard model (BSM). One of the processes sensitive to new physics is flavour-changing neutral currents (FCNC) that extremely rare in the SM but have enhanced behavior in several BSM scenarios. In this report we present results of projections of FCNC searches in top quark interactions to the FCC-hh conditions based on Monte-Carlo simulation of FCC-hh detector.
Searches for sterile neutrinos at very short baseline reactor experiments
Authors: Danilov M 
Published: November 2019

Abstract
For a long time there were 3 main experimental indications in favor of the existence of sterile neutrinos:

v
˜

e

appearance in the

v
˜

μ

beam in the LSND experiment,

v
˜

e

flux deficit in comparison with theoretical expectations in reactor experiments, and ve
deficit in calibration runs with radioactive sources in the Ga solar neutrino experiments SAGE and GALEX. All three problems can be explained by the existence of sterile neutrinos with the mass square difference in the ballpark of 1 eV2. Recently the MiniBooNE collaboration observed electron (anti)neutrino appearance in the muon (anti)neutrino beams. The significance of the effect reaches 6.0σ level when combined with the LSND result. Even more recently the NEUTRINO-4 collaboration claimed the observation of

v
˜

e

oscillations to sterile neutrinos with a significance slightly higher than 3σ. If these results are confirmed, New Physics beyond the Standard Model would be required. More than 10 experiments are devoted to searches of sterile neutrinos. Six very short baseline reactor experiments are taking data just now. We review the present results and perspectives of these experiments.
Reconstruction of the spectrum of cascades generated by VHE muons in the IceCube
Authors: Khokhlov Semyon 
Published: November 2019

Abstract
One of the best ways for the investigations of the VHE muons spectrum is measuring the spectrum of stochastic energy losses (cascades). IceCube is the detector capable of measuring the cascade spectrum in the energy region between tens of TeV and one PeV where manifestation of the prompt muon production mechanisms is predicted. In events with muon bundles, the longitudinal energy deposit profile reconstructed by means of a maximum likelihood method is analyzed. Cascade energies are estimated for the events in which the highest local energy deposit is much greater than the median energy deposit. The technique of cascade spectrum reconstruction has been tested with MC-simulated events. Criteria of the event selection, cascade parameters estimation accuracy and the efficiency of the spectrum reconstruction are discussed.
Analysis of thunderstorms based on the data obtained by MH URAGAN and DMRL-C
Authors: Kachur A P , Pavlyukov Yu B , Petrukhin A A , Serebryannik N I , Shutenko V V 
Published: November 2019

Abstract
Muon snapshots (muonographs) obtained by means of muon hodoscope URAGAN and meteorological maps from the Doppler weather radar DMRL-C during a thunderstorm event occurred in Moscow on August 30, 2018 are compared with each other in detail. Wavelet analysis of obtained muon data is performed. Search for possible predictors of a thunderstorm event is conducted.
Search for features in the cosmic-ray electron and positron spectrum measured by the Fermi Large Area Telescope
Authors: Mazziotta M. N. 
Published: November 2019

Abstract
Over its ten years of mission the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events. Possible features in their energy spectrum could be a signature of the presence of nearby astrophysical sources or of more exotic sources, such as annihilation or decay of dark matter (DM) particles in the Galaxy. We will present the results of the search for possible delta-like line features in the cosmic-ray electron and positron spectrum. We will also present the results of the search for possible features originating from DM particles annihilating into electron-positron pairs. We are able to set constraints on DM masses up to 1.7TeV/c2 and exclude the thermal value of the relic annihilation cross section for DM candidates lighter than 150 GeV/c2.
Search for Hidden Photon Dark Matter Using a Multi-Cathode Counter
Authors: Kopylov A , Orekhov I , Petukhov V 
Published: November 2019

Abstract
A search for hidden-photon (HP) dark matter using a multi-cathode counter is reported. The technique based on counting of single electrons emitted from outer cathode of the proportional counter by hidden-photons was used. The apparatus and the calibration of the counter by ultraviolet lamp are described. It is shown that this technique attains a maximum sensitivity in the energy range of Vacuum Ultraviolet. From the results of measurements we set an upper limit on the photon-HP mixing parameter η. A further progress of using a multicathode technique is discussed.