The CLAS Detector Experiments Database
The CLAS Detector Experiments Database
B. S. Ishkhanov$^{1,2}$, V. I. Mokeev$^3$, V. V. Chesnokov$^1$
The CLAS Physics Database has accumulated a vast array of data on cross sections, polarization asymmetries, structure functions, and many other observables obtained using the CLAS detector at the Jefferson Laboratory in photo and electroproduction of mesons on nucleons and atomic nuclei. The database has a web-interface that provides access to the data worldwide, as well as search capabilities, visualization and scientific data analysis. The accumulated data are of interest for testing the functioning of experimental facilities, planning future physical experiments, as well as for a number of related domains of fundamental physics.
Show AbstractExotic hole states of atoms created in the field of an X-ray free electron laser: Double K-vacancies in neon
Exotic hole states of atoms created in the field of an X-ray free electron laser: Double K-vacancies in neon
M. D. Kiselev$^1$, E. V. Gryzlova$^1$, A. N. Grum-Grzhimailo$^1$, O. .. Zatsarinny$^2$
Present article is dedicated to theoretical study of excitation and decay of a double K-vacancy during ionization of the Ne+(1s12s22p6) ion in the resonance Ne+(1s02s22p63p) region by the R-matrix method with B-splines. The resonance width in the photoabsorption cross section is crucially determined by Auger decay of the state Ne+(1s02s22p63p) with a spectator 3p electron. The Auger electron spectra from the decay of the double K-vacancy are obtained taking into account the photon beam width typical for such laser energies and the resolution of the electronic detector. The spectra correspond to the experiment with the detection of electrons for coincidences with the charge state of the ion. An experimental study of the process is available with modern X-ray free electron lasers.
Show AbstractPhotonuclear reactions on the yttrium isotope $^{89}$Y
Photonuclear reactions on the yttrium isotope $^{89}$Y
S. S. Belyshev$^2$, B. S. Ishkhanov$^{1,2}$, A. A. Kuznetsov$^{1,2}$, A. A. Prosnyakov$^2$, A. D. Fedorova$^2$, V. V. Khankin$^1$, N. Yu. Fursova$^1$
This paper presents the experimental research photodisintegration on the yttrium isotope 89Y. The absolute yields and average cross sections weighted by the bremsstrahlung spectrum for photoneutron reactions at the upper limit of the spectrum of the bremsstrahlung photons of 55 MeV are measured. Comparison of measured yields and average cross sections weighted by the bremsstrahlung spectrum was made with the yields of reactions calculated from theoretical sections of photoneutron reactions based on the TALYS model, as well as with the results of experiments performed on quasimonochromatic photons.
Show AbstractDevelopment and improvement of methods of physical laboratory practicum from the second half of XIX century to the present time
Development and improvement of methods of physical laboratory practicum from the second half of XIX century to the present time
I. V. Kuznetsova
Physics is an experimental science Methodological building of it is based on experimental confirmation of theoretical constructions. The explorations in experimental physics can be divided into three parts: preparation, measurement and processing of the results. Each of these parts requires special skills that need to be learned. A special role in the methodical system of modern physical education is occupied by practicum, where students get the skills necessary in each part of the experimental work. In the universities of natural profile and specialized schools has developed a system of teaching practical physics, which is based on the sequence of educational actions of the students. First, the student learns the theory necessary to perform the work of the physical research. Then receives the so-called "admission to work", talking with the teacher about the purpose of the work, the order of its implementation, instrumentation, etc. After performing in the allotted time, the experimental study, the processing of measurements, and then defend the results and receives an assessment for the work. This methodological triad has developed in all practicum. As noted by many teachers, currently interest to practical study decreased, which means the need to improve the methods used in them. In order to suggest ways to improve the methods of practical work, it is proposed to trace the historical retrospective of the emergence of physical practicums and their existing teaching methods from the moment of occurrence of it to the present time.
Show AbstractMethodical aspects of educational practical work in physics, developed on the basis of open scientific data
Methodical aspects of educational practical work in physics, developed on the basis of open scientific data
I. V. Kuznetsova$^1$, M. E. Prokhorov$^2$
The modern approach to teaching of specialists in engineering, scientific and practical field of activity requires the development of research skills. Such skills students (and graduate students) receive in the study of natural and technical disciplines, as well as performing some laboratory work in specially created laboratories of institutes, universities and schools. In the study of natural Sciences, especially physics, experimental and practical activities are extremely important. Students learn to use measuring devices, to receive experimental data, to process results according to the methodical descriptions offered in these works. They should learn to draw their own conclusions from the experimental data, use educational and reference books. Methodical aspects of practical works on physics, developed on the basis of open scientific data, differ from traditional works both in the form of methodological techniques used in the organization of educational activities, and the scale of the use of various technical means for “experiments”. Proposed laboratory work should allow the student in the allotted time: • to learn the field of science or Sciences to which laboratory work relates; • to study the necessary part of the mathematical apparatus; • to receive and independently process raw data for laboratory work from open sources; • to bring the processing to the final conclusions and compare them with some results of similar professional studies. The article deals with a series of practical laboratory and / or (extra-laboratory) works based on the counting of craters on the surface of the Moon and Mercury.
Show AbstractWhat is liquid?
What is liquid?
P. N. Nikolaev
The paper examines the process of formation of the modern concept of fluid. The history of fundamental experimental and theoretical research in this area is considered. Particular attention is paid to the most relevant areas of research and current problems of describing a liquid.
Show AbstractOrigin of the giant dipole resonance width of atomic nuclei
Origin of the giant dipole resonance width of atomic nuclei
I. M. Kapitonov
Based on the analysis of the entire set of available experimental and theoretical studies of the Giant Dipole Resonance of atomic nuclei, the main factors of the formation of its width and structure were established
Show AbstractStructure, phase composition and functional characteristics of titanium-based coatings obtained via reactive magnetron sputtering
Structure, phase composition and functional characteristics of titanium-based coatings obtained via reactive magnetron sputtering
V. M. Avdyukhina$^1$, M. M. Khrushchov$^2$, I. S. Levin$^2$, E. V. Kashurkin$^1$
The results of a comprehensive study of the effect of phase composition and microstructure features on the mechanical and tribological properties of titanium coatings obtained by reactive magnetron sputtering in the atmosphere of acetylene and nitrogen are presented. It was established that all the coatings contain amorphous carbon, and different types of stoichiometric and non-stoichiometric carbide, nitride and oxide phases of titanium. The resulting coatings have a low coefficient of friction and remain operational at contact pressures up to 450 MPa during 6000 cycles of friction-fatigue tests.
Show AbstractOptical communication systems on helical beams
Optical communication systems on helical beams
P. V. Korolenko$^{1,2}$, A. V. Averchenko$^1$, A. M. Zotov$^1$, N. N. Pavlov$^{1,2}$, Yu. V. Ryzhikova$^1$
The features of light beams propagation with a helical wavefront structure in information laser systems are analyzed. Calculations using parallel computing technology on the CUDA platform that significantly speeds up the calculation process is performed. The requirements for the alignment of the optical system with the multiplexing of beams in open propagation channels are formulated. It is shown that when radiation propagates in a medium with random inhomogeneities, the standard deviations of a Gaussian beam are one and a half times larger than the deviations of a beam with a helical wave-front shape. This indicates a high degree of stability of helical beams at atmospheric turbulent lines. A new method of generating high-power helical beams using the radiation of multi-pass modes of laser resonators is proposed.
Show AbstractA new approach to the study of optical illusions in school
A new approach to the study of optical illusions in school
S. B. Ryzhikov$^1$, Yu. V. Ryzhikova$^2$
The current FGES pays great attention to interdisciplinary training. The authors consider the most effective approach when selecting an interesting problem for students, which is seen from the perspective of different disciplines. The article illustrates the application of this approach on the example of considering the problem of human vision. The study of the phenomenon of vision requires the integration of knowledge of mathematicians, physicists, physiologists, psychologists and other specialists. The purpose of training is to be no transfer of a large number of illusions, and to identify the causes of their appearance. It is necessary to convey to students the idea that our vision has unique capabilities, and illusions are side effects of the manifestation of these abilities.
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