Subthreshold and near-threshold kaon and antikaon production in proton-nucleus reactions

The differential production cross sections of K^+ and K^- mesons have been measured at the ITEP proton synchrotron in p+Be, p+Cu collisions under lab angle of 10.5^0, respectively, at 1.7 and 2.25, 2.4 GeV beam energies. A detailed comparison of these data with the results of calculations within an appropriate folding model for incoherent primary proton-nucleon, secondary pion-nucleon kaon and antikaon production processes and processes associated with the creation of antikaons via the decay of intermediate phi mesons is given. We show that the strangeness exchange process YN->NNK^- gives a small contribution to the antikaon yield in the kinematics of the performed experiment. We argue that in the case when antikaon production processes are dominated by the channels with KK^- in the final state, the cross sections of the corresponding reactions are weakly influenced by the in-medium kaon and antikaon mean fields.Comment: 24 pages. accepted for publication at J.Phys.

Danilov Nicolai Igorievich – founder of the department "Energy saving" of USTU-UPI-URFU and scientific methodical school "Energy saving and enhancement of energy efficiency" in Sverdlovsk region and in the Ural region

Abstract: The main milestones and achievements of prof. Danilov N. I. – the founder of the department «Energy-saving» of the USTU-UPI-UrFU and the scientific-methodical school «Energy saving and enhancement of energy efficiency» in the Sverdlovsk region and in the Ural region.Представлены основные жизненные вехи и достижения проф. Данилова Н. И. – основателя кафедры «Энергосбережение» УГТУ-УПИ-УрФУ и научно-методической школы «Энергосбережение и повышение энергетической эффективности» в Свердловской области и в Уральском регионе

Measurement of J/ψ→γηcJ/\psi\to\gamma\eta_{\rm c} decay rate and ηc\eta_{\rm c} parameters at KEDR

Using the inclusive photon spectrum based on a data sample collected at the $J/\psi$ peak with the KEDR detector at the VEPP-4M $e^+e^-$ collider, we measured the rate of the radiative decay $J/\psi\to\gamma\eta_{\rm c}$ as well as $\eta_{\rm c}$ mass and width. Taking into account an asymmetric photon lineshape we obtained $\Gamma^0_{\gamma\eta_{\rm c}}=2.98\pm0.18 \phantom{|}^{+0.15}_{-0.33}$ keV, $M_{\eta_{\rm c}} = 2983.5 \pm 1.4 \phantom{|}^{+1.6}_{-3.6}$ MeV/$c^2$, $\Gamma_{\eta_{\rm c}} = 27.2 \pm 3.1 \phantom{|}^{+5.4}_{-2.6}$ MeV.Comment: 6 pages, 3 figure

Analysis of hadron production in nucleus-nucleus interactions up to and out of kinematical limit of free NN-collisions in the frame of FRITIOF model

In the framework of the modified FRITIOF model, the inclusive spectra of the cumulative $\pi ^0$-, $\pi ^-$-mesons and protons produced in the nucleus-nucleus interactions at 4.5 GeV/c/nucleon and 4.2 GeV/c/nucleon are calculated. It is shown that the model reproduces qualitatively, and in some cases quantitatively the main experimental regularities of $\pi$-mesons production, and "soft" part of the proton spectra. According to the model the production of the cumulative particles is connected with the mechanism of the "soft" nucleon-nucleon interaction.Comment: 12 pages, 11 figure

Measurement of B(J/psi->eta_c gamma) at KEDR

We present a study of the inclusive photon spectrum from 6.3 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of the radiative decay J/psi -> eta_c gamma, eta_c width and mass. Taking into account an asymmetric photon line shape we obtain: M(eta_c) = (2978.1 +- 1.4 +- 2.0) MeV/c^2, Gamma(eta_c) = (43.5 +- 5.4 +- 15.8) MeV, B(J/psi->eta_c gamma) = (2.59 +- 0.16 +- 0.31)%$.Comment: 6 pages, 1 figure. To be published in the proceedings of the 4th International Workshop on Charm Physics (Charm2010), October 21-24, 2010, IHEP, Beijin

Low-energy Compton scattering on the nucleon and sum rules

The Gerasimov-Drell-Hearn and Baldin-Lapidus sum rules are evaluated in the dressed K-matrix model for photon-induced reactions on the nucleon. For the first time the sum $\alpha+\beta$ of the electric and magnetic polarisabilities and the forward spin polarisability $\gamma_0$ are explicitly calculated in two alternative ways -- from the sum rules and from the low-energy expansion of the real Compton scattering amplitude -- within the {\em same} framework. The two methods yield compatible values for $\alpha+\beta$ but differ somewhat for $\gamma_0$. Consistency between the two ways of determining the polarisabilities is a measure of the extent to which basic symmetries of the model are obeyed.Comment: 9 pages, 4 figures, using REVTeX. More concise version, results unchanged. To appear in Phys. Rev.

Measurement of J/psi to eta_c gamma at KEDR

We present a study of the inclusive photon spectra from 5.9 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of radiative decay J/psi to eta_c gamma, eta_c width and mass. Our preliminary results are: M(eta_c) = 2979.4+-1.5+-1.9 MeV, G(eta_c) = 27.8+-5.1+-3.3 MeV, B(J/psi to eta_c gamma) = (2.34+-0.15+-0.40)%.Comment: To be published in Proceedings of the PhiPsi09, Oct. 13-16, 2009, Beijing, Chin

MAIN RESULTS OF THE INTERNATIONAL YOUTH DANILOVSKY ENERGY FORUM – OLYMPIADS AND CONFERENCES “ENERGY AND RESOURCE SAVING. POWER SUPPLY. NON-TRADITIONAL AND RENEWABLE SOURCES OF ENERGY. NUCLEAR ENERGY” – 2018 IN URFU

Представлены краткие итоги Международного молодежного Даниловского энергетического Форума, проведенного в УрФУ, г. Екатеринбург 10-14 декабря 2018 г. Изложены основные результаты олимпиады по дисциплинам «Энерго- и ресурсосбережение», «Нетрадиционные и возобновляемые источники энергии», «Атомная энергетика» и конференции «Энерго- и ресурсосбережение. Энергообеспечение. Нетрадиционные и возобновляемые источники энергии. Атомная энергетика».Brief results of the International Youth Danilov Energy Forum held in UrFU Yekaterinburg, December 10-14, 2018 are presented. The main results of the Olympiad in the disciplines “Energy and Resource Saving”, “Alternative and Renewable Energy Sources”, “Nuclear Energy” and conferences are presented “Energy and resource saving. Power supply. Unconventional and renewable energy sources. Nuclear power"

MAIN RESULTS OF THE INTERNATIONAL YOUTH DANILOV ENERGY FORUM — 2019

Brief results of the International Youth Danilovsky Energy Forum held at Ural Federal University (Yekaterinburg, December 9–13, 2019) are presented. The main results of the student Olympiad and conferences “Energy and Resource Saving. Power supply. Non-traditional and renewable energy sources. Nuclear power” are presented.Представлены краткие итоги Международного молодежного Даниловского энергетического форума, проведенного в Уральском федеральном университете (Екатеринбург, 9–13 декабря 2019 г.). Изложены основные результаты студенческой олимпиады и научно-практической конференции, рассматривающих следующие темы: энерго- и ресурсосбережение, нетрадиционные и возобновляемые источники энергии, атомная энергетика