There is a model that includes viscosity at the lambda point in the transition to the superfluid state. This viscosity is expressed in terms of composite operators of dimension 8, but composite operators of dimension 6 are mixed with them. In dynamics, composite operators were almost not considered, but dynamic operators of dimension 6 can be investigated without additional calculations.
We investigate electronic spectrum and superconductivity in the extended $t − J − V$ model where the intersite Coulomb repulsion and the electron-phonon interaction (EPI) are taken into account. The exact Dyson equation for the normal and anomalous (pair) Green functions (GFs) is derived for the projected Hubbard operator. The equation is found in the self-consistent Born approximation (SCBA)...
Today, low and middle energy accelerators (linac, cyclotron) play an important role for the study of the nuclei structure, for the radiation material science, for the production of radionuclides used in medical technologies and for the cancer treatment. One of the main goals for these accelerators operation is to improve the quality of the extracted beams. Therefore, one can develop the system...
Since the first detection of neutrino in 1956, scientists have discovered that there are three kinds (or flavors) of neutrino particles, that these particles have mass (in defiance of the Standard Model), and that they oscillate between the three types as they travel. Deep Underground Neutrino Experiment (DUNE) will be the world’s most advanced and comprehensive experiment dedicated to...
We propose higher-derivative dual representation for the massless spin two theory by the third-rank tensor with hook Young diagram. Using the general procedure for including Stueckelberg fields with reducible gauge symmetry, we demonstrate that we can switch between different dual formulations by the choice of gauge-fixing conditions in the Stueckelberg action. For the massless spin two field...
Fe-Ga compounds show high magnetostriction values depending on Ga content and thermal treatment. The physical cause of the giant magnetostriction effect is still not clear despite more than 20 years of research. The alloys have a complex phase diagram, which continues to be investigated by various methods, including electron, neutron, X-ray and synchrotron radiation diffraction. In a number of...
Lead iron tungsten oxide, Pb(Fe2/3W1/3)O3 (PFW), is one of the well-known magnetoelectric relaxors which may be considered as the prototype for fundamental understanding of the magnetoelectric interactions. It is a ferroelectric and antiferromagnetic perovskite, in which the cations (Fe3+ and W6+) are randomly distributed in the octahedral B-site positions. The ferroelectric Curie temperature...
The aggregation of the β-amyloid peptide (Aβ) is known to contribute to the accumulation of amyloid plaques in brain, which leads to the formation of a variety of diseases such as Alzheimer's. This work focuses on the conformational changes of Aβ (1-42) in the lipid membrane. The study was carried out by Raman spectroscopy, which is non-invasive, fast and does not require any sophisticated...
Standard radiotherapy for neoplasms is associated with a high risk of post-radiation damage. Due to this, the task of increasing the radiosensitivity of the tumor to radiation is relevant. One such promising medication is the synthetic nucleoside AraC (cytosine arabinoside). The aim of the work was to study the effect of the combined use of protons at a dose of 3 Gy and AraC on the...
We consider a statistical mechanics of a rotating gas of massive relativistic particles with nonzero spin. Applying the formalism of Gibbs ensembles, we derive a one-particle distribution function by positions, momenta, and directions of spin. For zero angular velocity, the distribution coincides with well-known Maxwell-Juttner distribution. For nonzero angular velocity, corrections caused by...
Reactions with 14.1 MeV neutrons are interest for fundamental research in nuclear physics. Due to the compactness and prevalence of modern neutron generators, reactions with neutrons of these energies have found wide application in applied work, for example, in elemental analysis. To perform such studies and plan new experiments, the complete and accurate databases of nuclear data are needed....
Rutherford Backscattering Spectrometry (RBS) is an ion scattering technique used for compositional thin film that are less than 1μm thick analysis. During an RBS analysis, high-energy He2+ ions with energies in the region from several hundred kiloelectron-volts to 2 - 3 MeV are directed onto the sample and the energy distribution and yield of the backscattered He2+ ions at a given angle is...
NETosis is a programmed cell death which occurs in response to various types of stimuli. Nowadays, studies devoted to the investigation of photoinduced NETosis activated predominantly by ultraviolet (UV) radiation are becoming increasingly important. This work is devoted to the study of the activation of neutrophils at two wavelengths to cause photoinduced NETosis at three different doses of...
During the last decade Lead Halide Perovskites (LHPs) have been widely researched in the photovoltaic and light emission fields due to their outstanding optoelectronic properties and exceptional performance. Owing to their low cost and easy fabrication, tremendous achievements were achieved in solar cell, photodetector, light‐emitting diode and laser research fields.
On the other hand, space...
The technological application of nanoscale functional elements made of individual molecules is a promising approach towards the miniaturization of electronic devices. In particular, there is a potential for exploiting quantum interference effects in controlling the charge transport in these molecular-scale devices.
The electronic conduction G=I/V is determined by the electronic current I...
We consider the motion of a non-relativistic charged particle with an arbitrary spin in central potential Ze/r in terms of classical mechanics. We show that the spin-orbital interaction causes the precession of the plane of orbit around the vector of total angular momentum. The angular velocity of precession depends on the distance of the particle from the center. The effective potential for...
Studies of nuclei with proton or neutron excess remain highly relevant in modern nuclear physics. New information about the nature of baryon-baryon interactions can be extracted from properties of hypernuclei near the stability limits. ΛN-interaction is attractive, therefore, addition of a Λ-hyperon to non-strange nuclei can lead to an increase in the binding energy and formation of a bound...
The NA-62 is a CERN fixed-target experiment upgraded from the NA-48 detector at the Super Proton Synchroton. The main scope of NA-62 is the study of the ultra-rare kaon decays in a higher luminosity context than the E-949 experiment of the C4 beamline (LESB III) at the AGS-Synchrotron (Brookhaven National Laboratory). Since in the Standard Model the branching ratios are almost completely...
This paper presents a model for determining the second critical field of superconductors, obtained on the basis of changes in the spin basis states of a system of two particles with spin 1/2 in a magnetic field. The obtained critical field estimate is consistent with experimental data for superconducting alloys, some metallic compounds, nitrides and Laves phases, fullerides and other...
Di-hadron angular correlations are a useful tool to study the mechanisms of particle production by observing the angular separation (∆η, ∆φ) between pairs of particles in an event. Different structures in the ∆η − ∆φ space are caused by various modes of particle production and interactions between particles shortly after production. Examining these structures can give us insight into the...
This study describes the detecting device development and approbation using for measurement of the flux density distribution in the transverse plane of the high-energy charged particle beams by the multi-angle scanning method. Currently, for the implementation of ion and proton radiotherapy procedures high-precision monitoring systems are needed to determine such characteristics of the beams...
The purpose of our experiment was to study physiological state of the body and morphofunctional changes in brain tissue of aged group of mice after 1 month of gamma irradiation. The experiment was conducted with 7 month old male mice, divided in 2 groups: control and irradiated one. One month after 2 Gy Gamma irritation we carried out behavioral test, blood analysis, and examined other...
