2025, Решетников, С. Ф., Афонин, А. Г., Барнов, Е. В., Васильев, А. Н., Маишеев, В. А., Мочалов, В. В., Семенов, П. А., Чесноков, Ю. А, Мочалов, Василий Вадимович, Семенов, Павел Александрович, Васильев, Александр Николаевич

Представлены результаты работ по управлению интенсивности пучка протонов, выводимого из ускорителя У-70 с помощью изогнутых монокристаллов кремния. Продемонстрирована устойчивая работа вывода пучка, с помощью кристаллов, для двух экспериментов, где требовалась плавная регулировка интенсивности пучка в большом динамическом диапазоне.

2021, Barucca, G., Davi, F., Lancioni, G., Mengucci, P., Mochalov, V., Semenov, P., Vasiliev, A., Мочалов, Василий Вадимович, Семенов, Павел Александрович, Васильев, Александр Николаевич

© 2021, The Author(s).The antiproton experiment PANDA at FAIR is designed to bring hadron physics to a new level in terms of scope, precision and accuracy. In this work, its unique capability for studies of hyperons is outlined. We discuss ground-state hyperons as diagnostic tools to study non-perturbative aspects of the strong interaction, and fundamental symmetries. New simulation studies have been carried out for two benchmark hyperon-antihyperon production channels: p¯ p→ Λ¯ Λ and p¯ p→ Ξ¯ +Ξ-. The results, presented in detail in this paper, show that hyperon-antihyperon pairs from these reactions can be exclusively reconstructed with high efficiency and very low background contamination. In addition, the polarisation and spin correlations have been studied, exploiting the weak, self-analysing decay of hyperons and antihyperons. Two independent approaches to the finite efficiency have been applied and evaluated: one standard multidimensional efficiency correction approach, and one efficiency independent approach. The applicability of the latter was thoroughly evaluated for all channels, beam momenta and observables. The standard method yields good results in all cases, and shows that spin observables can be studied with high precision and accuracy already in the first phase of data taking with PANDA.

2022, Meshchanin, A. P., Vasiliev, A. N., Mochalov, V. V., Rykov, V. L., Semenov, P. A., Васильев, Александр Николаевич, Мочалов, Василий Вадимович, Рыков, Владимир Львович, Семенов, Павел Александрович

2023, Ryazantsev, A. V., Bukreeva, S. I., Vasiliev, A. N., Mochalov, V. V., Semenov, P. A., Васильев, Александр Николаевич, Мочалов, Василий Вадимович, Семенов, Павел Александрович

2023, Мещанин, А. П., Васильев, А. Н., Гончаренко, Ю. М., Кормилицын, В. А., Минаев, Н. Г., Мочалов, В. В., Рыков, В. Л., Рябов, А. Д., Рябова, Т. Д., Рязанцев, А. В., Семенов, П. А., Сёмин, С. А., Симонова, З. Г., Рыков, Владимир Львович, Мочалов, Василий Вадимович, Васильев, Александр Николаевич, Семенов, Павел Александрович

Описана система из четырех магнитов, являющаяся частью экспериментальной установки СПА-СЧАРМ на ускорительном комплексе У-70 для исследования спиновых эффектов в адронных взаимодействиях. Уникальный магнит с полем 2.4 Тл и однородностью поля на уровне 10–4 в рабочем объеме 60 см3 служит для накачки и удержания поляризации в поляризованной протон-ной замороженной мишени. Специальный широкоапертурный магнит является центральной ча-стью спектрометра установки на основе дрейфовых трубок. Для прецизионного наведения пучка на центр мишени были изготовлены и введены в состав установки два небольших корректирующих магнита разработки НИИЭФА им. Д.В. Ефремова.

2021, Barucca, G., Davi, F., Lancioni, G., Mengucci, P., Mochalov, V., Semenov, P., Vasiliev, A., Мочалов, Василий Вадимович, Семенов, Павел Александрович, Васильев, Александр Николаевич

The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or PANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the non-perturbative regime remains one of the greatest challenges in contemporary physics. The antiproton-nucleon interaction studied with PANDA provides crucial tests in this area. Furthermore, the high-intensity, low-energy domain of PANDA allows for searches for physics beyond the Standard Model, e.g. through high precision symmetry tests. This paper takes into account a staged approach for the detector setup and for the delivered luminosity from the accelerator. The available detector setup at the time of the delivery of the first antiproton beams in the HESR storage ring is referred to as the Phase One setup. The physics programme that is achievable during Phase One is outlined in this paper.

2023, Abramov, V. V., Azhgirey, I. L., Borisov, A. A., Bukreeva, S. I., Vasiliev, A. N., Mochalov, V. V., Semenov, P. A., Bogdanov, A. A., Nurusheva, M. B., Okorokov, V. A., Rykov, V. L., Strikhanov, M. N., Васильев, Александр Николаевич, Мочалов, Василий Вадимович, Семенов, Павел Александрович, Богданов, Алексей Александрович, Нурушева, Марина Борисовна, Окороков, Виталий Алексеевич, Рыков, Владимир Львович, Стриханов, Михаил Николаевич

2021, Barucca, G., Davi, F., Lancioni, G., Mengucci, P., Mochalov, V., Semenov, P., Vasiliev, A., Мочалов, Василий Вадимович, Семенов, Павел Александрович, Васильев, Александр Николаевич

© 2021, The Author(s).The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards N∗ and Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the N∗ and Δ spectra. The future antiproton experiment P¯ANDA will provide direct access to final states containing a Ξ¯ Ξ pair, for which production cross sections up to μb are expected in p¯p reactions. With a luminosity of L= 10 31 cm- 2 s- 1 in the first phase of the experiment, the expected cross sections correspond to a production rate of ∼106events/day. With a nearly 4 π detector acceptance, P¯ANDA will thus be a hyperon factory. In this study, reactions of the type p¯p → Ξ¯ +Ξ∗ - as well as p¯p → Ξ¯ ∗ +Ξ- with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between 3 and 5%. This allows high statistics data to be collected within a few weeks of data taking.

2022, Abdul Khalek, R., Accardi, A., Adam, J., Adamiak, D., Mochalov, V., Okorokov, V., Мочалов, Василий Вадимович, Окороков, Виталий Алексеевич

This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon and nuclei where their structure is dominated by gluons. Moreover, polarized beams in the EIC will give unprecedented access to the spatial and spin structure of the proton, neutron, and light ions. The studies leading to this document were commissioned and organized by the EIC User Group with the objective of advancing the state and detail of the physics program and developing detector concepts that meet the emerging requirements in preparation for the realization of the EIC. The effort aims to provide the basis for further development of concepts for experimental equipment best suited for the science needs, including the importance of two complementary detectors and interaction regions. This report consists of three volumes. Volume I is an executive summary of our findings and developed concepts. In Volume II we describe studies of a wide range of physics measurements and the emerging requirements on detector acceptance and performance. Volume III discusses general-purpose detector concepts and the underlying technologies to meet the physics requirements. These considerations will form the basis for a world-class experimental program that aims to increase our understanding of the fundamental structure of all visible matter. © 2022 Elsevier B.V.

2024, Abramov,V.V., Moiseev,V.V., Alekseev,I.G., Bazhanov,N.A., Vasiliev,A.N., Mochalov,V.V., Nurusheva,M.B., Rykov,V.L., Semenov,P.A., Васильев, Александр Николаевич, Мочалов, Василий Вадимович, Нурушева, Марина Борисовна, Рыков, Владимир Львович, Семенов, Павел Александрович