New accurate measurement of tensor analyzing power T_20 in the reaction γ + 𝐝→π ^0 +d has been performed at the VEPP-3 storage ring at Budker Institute, in an energy range 200<E_γ <500 MeV and a pion emission angle 90^∘<θ _π ^cm<140^∘ . Preliminary results of data analysis are presented and compared to theoretical calculations.

New accurate measurement of tensor analyzing power \(T_{20}\) in the reaction \(\gamma + \mathbf {d}\rightarrow \pi ^0 +d\) has been performed at the VEPP-3 storage ring at Budker Institute, in an energy range \(200<E_\gamma <500\) MeV and a pion emission angle \(90^\circ<\theta _\pi ^{cm}<140^\circ \). Preliminary results of data analysis are presented and compared to theoretical calculations.

Nucleon-antinucleon optical potential, which explains the experimental data for the processes e + e ! p p and e + e ! pions near the threshold of p p pair production, is suggested. To obtain this potential we have used the available experimental data for p p scattering, p p pair production in e + e annihilation, and the ratio of electromagnetic form factors of a proton in the timelike region. It turns out that nal-state interaction via the optical potential allows one to reproduce the available experimental data with good accuracy. Our results for the cross sections ofe + e ! 6 process near the threshold of p p pair production are in agreement with the recent experiments.

The differential decay rates of the processes J/ψ→ pp̅π^0 and J/ψ→ pp̅η close to the pp̅ threshold are calculated with the help of the NN̅ optical potential. The same calculations are made for the decays of ψ(2S). We use the potential which has been suggested to fit the cross sections of NN̅ scattering together with NN̅ and six pion production in e^+e^- annihilation close to the pp̅ threshold. The pp̅ invariant mass spectra is in agreement with the available experimental data. The anisotropy of the angular distributions, which appears due to the tensor forces in the NN̅ interaction, is predicted close to the pp̅ threshold. This anisotropy is large enough to be investigated experimentally. Such measurements would allow one to check the accuracy of the model of NN̅ interaction.

The differential decay rates of the processes J/ψ→pp¯π0 and J/ψ→pp¯η close to the pp¯ threshold are calculated with the help of the NN¯ optical potential. The same calculations are made for the decays of ψ(2S). We use the potential which has been suggested to fit the cross sections of NN¯ scattering together with NN¯ and six pion production in e+e− annihilation close to the pp¯ threshold. The pp¯ invariant mass spectrum is in agreement with the available experimental data. The anisotropy of the angular distributions, which appears due to the tensor forces in the NN¯ interaction, is predicted close to the pp¯ threshold. This anisotropy is large enough to be investigated experimentally. Such measurements would allow one to check the accuracy of the model of NN¯ interaction.

The differential decay rates of the processes J/psi -> p (p) over bar pi(0) and J/psi -> p (p) over bar eta close to the p (p) over bar threshold are calculated with the help of the N (N) over bar optical potential. The same calculations are made for the decays of psi(2S). We use the potential which has been suggested to fit the cross sections of N (N) over bar scattering together with N (N) over bar and six pion production in e(+)e(-) annihilation close to the p (p) over bar threshold. The p (p) over bar invariant mass spectrum is in agreement with the available experimental data. The anisotropy of the angular distributions, which appears due to the tensor forces in the N (N) over bar interaction, is predicted close to the p (p) over bar threshold. This anisotropy is large enough to be investigated experimentally. Such measurements would allow one to check the accuracy of the model of N (N) over bar interaction. (C) 2016 The Author(s). Published by Elsevier B.V.

The computation simulation results of operating RFID system with SAW tags using Barker encoded interrogation signal are presented. The particularity of the considered RFID system operation mode is the use of composite signal generated in the inquiry unit to interrogate SAW tag and the use of correlation processing when receiving tag response signal. This operation mode improves interference resistant and operating range of SAW RFID systems.

The differential decay rates of the processes J/ψ→pp¯π0 and J/ψ→pp¯η close to the pp¯ threshold are calculated with the help of the NN¯ optical potential. The same calculations are made for the decays of ψ(2S). We use the potential which has been suggested to fit the cross sections of NN¯ scattering together with NN¯ and six pion production in e+e− annihilation close to the pp¯ threshold. The pp¯ invariant mass spectrum is in agreement with the available experimental data. The anisotropy of the angular distributions, which appears due to the tensor forces in the NN¯ interaction, is predicted close to the pp¯ threshold. This anisotropy is large enough to be investigated experimentally. Such measurements would allow one to check the accuracy of the model of NN¯ interaction.

An experiment to measure tensor analyzing power component T 20 of the coherent photoproduction reaction of a neutral pion on a tensor-polarized deuterium target \(\left( {\gamma \vec d \to d\pi ^0 } \right)\) is described. Measurements are made in two kinematic ranges: photon energy E γ = 200–500 MeV and neutral pion escape angle \(\Theta _{\pi ^0 }^{cm} = 100^ \circ - 140^ \circ\), E γ = 300–600 MeV, and \(\Theta _{\pi ^0 }^{cm} = 40^ \circ - 70^ \circ\). A hyperfine internal gas polarized target is used in the experiment. Detectors of neutral pions and deuterons register these particles when they coincide. The degree of target polarization and experimental luminosity are measured via the registration of elastic electron scattering on a deuteron at a low momentum of transfer. The preliminary experimental results are compared to certain theoretical predictions.

Russian Abstract: Материал источников позволяет утверждать, что «ночное» сражение под Сингарой, достаточно подробно описанное в панегириках Либания и Юлиана, а также (более сжато или фрагментарно, зачастую — на уровне краткого упоминания) в сочинениях Феста, Евтропия, Аммиана Марцеллина, Иеронима, Павла Орозия, Сократа Схоластика, Якова Эдесского, Иоанна Зонары и в «Константинопольской консулярии», произошло летом (в июле или августе) 344 г. на равнине, расположенной непосредственно к западу от Тигра в направлении Сингары. Дата «ночной» битвы, содержащаяся в хрониках Иеронима и Якова Эдесского, а также в «Константинопольской консулярии» (348 г.), должна быть отнесена к другому сражению, также произошедшему под Сингарой, но четырьмя годами позднее. На всех этапах битвы инициатива находилась в руках персов, император же Констанций действовал в русле персидской стратегии, что позволило Шапуру II достичь поставленной цели, заключавшейся, вероятнее всего, не в захвате Сингары или разорении римских владений, а в причинении противнику как можно более серьезных военных потерь. English Abstract: The material of the sources makes it possible to assert that the night battle at Singara, described in detail in the panegyrics of Libaniya and Julian and also (more concisely or fragmentarily) in the writings of Festus, Eutropius, Ammianus Marcellinus, Hieronymus, Paul Orosius, Socrates Scholastic, Jacob of Edessa, John Zonaras and in the Consularia Constantinipolitana, occurred in the summer (July or August) of 344 AD on the plain situated directly to the west of the Tigris in the direction of Singara (modern Sinjar). The date of the night battle, described in the chronicles of Jerome and Jacob of Edessa as well as in the Consularia Constantinipolitana (348 AD), should be attributed to another battle, also occurred near Singara, but four years later. At all stages of the battle, the initiative was in the hands of the Persians, while the emperor Constantius acted in the mainstream of the Persian strategy. So, shakhanshakh Shapur II achieved his goal, most likely not in capturing Singara or ruining the Roman fortresses but in inflicting of serious military losses to the Romans.

A striking discrepancy between the results for the ratio of electric and magnetic form factors of the proton obtained by two approaches: the Rosenbluth extraction from the unpolarized cross section and the double-polarization measurements has led to a serious re-examination of the role played by two-photon exchange diagrams. The evaluation of such diagrams could not be done in model-independent way, which means an experimental verification is required. One of the direct ways to do this is to measure the ratio of positron–proton and electron–proton elastic scattering cross-sections for identical kinematics. Such a measurement has been performed at the VEPP-3 storage ring at Novosibirsk. There were two runs at beam energies of 1.6 and 1.0 GeV at several ranges of scattering angle. The measurements covered the transferred momentum Q2 up to 1.5 GeV2 and the virtual photon polarization parameter ϵ down to 0.2 . The VEPP-3 experimental approach is described and the results of the measurements are presented.

Электромагнитные формфакторы протона являются важнейшим источником наших знаний о его внутренней структуре. Два различных метода измерения этих формфакторов, метод Розенблюта и метод передачи поляризации, дают противоречивые результаты. Предполагается, что это противоречие может быть устранено при учете жесткой части вклада двухфотонного обмена в сечение упругого -рассеяния. Этот вклад может быть измерен экспериментально, путем прецизионного сравнения сечений упругого рассеяния позитронов и электронов на протонах. В настоящей работе описано такое измерение, проведенное на накопительном кольце ВЭПП-3, Новосибирск, при двух энергиях пучка, и ГэВ, и углах рассеяния позитронов/электронов , в первом случае и во втором случае. Приводятся предварительные результаты эксперимента и их сравнение с теоретическими предсказаниями.

The ratio of the elastic e(+)p to e(-)p scattering cross sections has been measured precisely, allowing the determination of the two-photon exchange contribution to these processes. This neglected contribution is believed to be the cause of the discrepancy between the Rosenbluth and polarization transfer methods of measuring the proton electromagnetic form factors. The experiment was performed at the VEPP-3 storage ring at beam energies of 1.6 and 1.0 GeV and at lepton scattering angles between 15° and 105°. The data obtained show evidence of a significant two-photon exchange effect. The results are compared with several theoretical predictions.

Proton electromagnetic form factors are among the most important sources of information about the internal structure of the proton. Two different methods for measuring these form factors, the method proposed by Rosenbluth and the polarization-transfer method, yield contradictory results. It is assumed that this contradiction can be removed upon taking into account the hard part of the contribution of two-photon exchange to the cross section for elastic electron-proton scattering. This contribution can measured experimentally via a precision comparison of the cross sections for the elastic scattering of positrons and electrons on protons. Such a measurement, performed at the VEPP-3 storage ring in Novosibirsk at the beam energies of 1.6 and 1.0 GeV for positron (electron) scattering angles in the ranges of θ e = 15°–25° and 55°–75° in the first case and in the range of θ e = 65°–105° in the second case is described in the present article. Preliminary results of this experiment and their comparison with theoretical predictions are described.

At BINP the construction of the tagging system for almost-real photons (TS) is in progress. The energy of tagging photons can be up to 1.5 GeV. The projected energy resolution of TS is better then 1%. For at least a half of photons the linear polarization can be determined. The tagging system will extend the possibilities for photoreaction studying at VEPP-3 significantly. TS would allow to perform a complete kinematics reconstruction, thus permitting a reliable rejection of the background processes; to extend the measurements to higher photon energy; to enabling Σ-asymmetry measurements and double polarization experiments.

We describe a precise measurement of the ratio of the ( e + p ) to ( e − p ) elastic scattering cross sections. This comparison is sensitive to the effect of two-photon exchange contributions which may be the cause for inconsistent extractions of the proton form factors obtained using different methods. The experiment was performed at storage ring VEPP–3, Novosibirsk at energies of positron/electron beams of 1.0 and 1.6 GeV with electron/positron scattering angles θ = 65÷105° for the first case and 15÷25° and 55÷75° for the second case. Details of the experiment and the preliminary results are presented.

We use the Paris nucleon-antinucleon optical potential for explanation of experimental data in the process e + e − → p p̄ near threshold. It turns out that final-state interaction due to Paris optical potential allows us to reproduce available experimental data. It follows from our consideration that the isoscalar form factor is much larger than the isovector one.