Production of {\pi}+ and K+ mesons in argon-nucleus interactions at 3.2 AGeV

First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on {\pi}+ and K+ meson production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse momentum distributions, rapidity spectra and multiplicities of {\pi}+ and K+ mesons are measured. The results are compared with predictions of theoretical models and with other measurements at lower energies.Comment: 29 pages, 20 figure

Approaches in assessing the investment attractiveness of small towns of Russia

Effective use of the territories’ resources depends on the development of small- and medium-sized business as the basis of high economic activity of the local population. In Russia small and medium-sized business is a priority vector of economic development, a factor of the gross domestic product increase, and of unemployment decline. The article describes a methodological approach to assess the development of small scale and medium-sized enterprises of the territory bearing in mind the adaptation of some known methods to the peculiarities of the regional economy. The authors also assessed the investment potential and investment attractiveness on the example of the town of Barabinsk of the Novosibirsk Region. The article proves that small and medium business has great potential for further development, giving rise to many promising projects; still the paper reveals some actual problems delaying the process of small and medium-sized enterprises expansion. In the conclusion some activities for further promotion and stimulation of small and medium business development in the town of Barabinsk are proposed

Approaches in assessing the investment attractiveness of small towns of Russia

Effective use of the territories’ resources depends on the development of small- and medium-sized business as the basis of high economic activity of the local population. In Russia small and medium-sized business is a priority vector of economic development, a factor of the gross domestic product increase, and of unemployment decline. The article describes a methodological approach to assess the development of small scale and medium-sized enterprises of the territory bearing in mind the adaptation of some known methods to the peculiarities of the regional economy. The authors also assessed the investment potential and investment attractiveness on the example of the town of Barabinsk of the Novosibirsk Region. The article proves that small and medium business has great potential for further development, giving rise to many promising projects; still the paper reveals some actual problems delaying the process of small and medium-sized enterprises expansion. In the conclusion some activities for further promotion and stimulation of small and medium business development in the town of Barabinsk are proposed

A detector system for studying nuclear reactions relevant to Single Event Effects

We describe a device to study reactions relevant for the Single Event Effect (SEE) in microelectronics by means of 200A and 300AMeV, inverse kinematics, Si + H and Si + D reactions. The work is focused on the possibility to measure Z = 2-14 projectile fragments as efficiently as possible. During commissioning and first experiments the fourth quadrant of the CELSIUS storage ring acted as a spectrometer to register fragments in two planes of Si strip detectors in the angular region 0 degrees-0.6 degrees. A combination of ring-structured and sector-structured Si strip detector planes operated at angles 0.6 degrees-1.1 degrees. For specific event tagging a Si+ phoswich scintillator wall operated in the range 3.9 degrees-11.7 degrees and Si Delta E-E telescopes of CHICSi type operated at large angles. (c) 2007 Elsevier B.V. All rights reserved

Unperturbed inverse kinematics nucleon knockout measurements with a carbon beam

From superconductors to atomic nuclei, strongly-interacting many-body systems are ubiquitous in nature. Measuring the microscopic structure of such systems is a formidable challenge, often met by particle knockout scattering experiments. While such measurements are fundamental for mapping the structure of atomic nuclei, their interpretation is often challenged by quantum mechanical initial- and final-state interactions (ISI/FSI) of the incoming and scattered particles. Here we overcome this fundamental limitation by measuring the quasi-free scattering of 48 GeV/c 12C ions from hydrogen. The distribution of single protons is studied by detecting two protons at large angles in coincidence with an intact 11B nucleus. The 11B detection is shown to select the transparent part of the reaction and exclude the otherwise large ISI/FSI that would break the 11B apart. By further detecting residual 10B and 10Be nuclei, we also identified short-range correlated (SRC) nucleon-nucleon pairs, and provide direct experimental evidence for the separation of the pair wave-function from that of the residual many-body nuclear system. All measured reactions are well described by theoretical calculations that do not contain ISI/FSI distortions. Our results thus showcase a new ability to study the short-distance structure of short-lived radioactive atomic nuclei at the forthcoming FAIR and FRIB facilities. These studies will be pivotal for developing a ground-breaking microscopic understanding of the structure and properties of nuclei far from stability and the formation of visible matter in the universe.Comment: Accepted for publication in Nature Physics. 28 pages, 19 figures, and 1 table including main text, Methods, and Supplementary material

Status and initial physics performance studies of the MPD experiment at NICA

The Nuclotron-based Ion Collider fAcility (NICA) is under construction at the Joint Institute for Nuclear Research (JINR), with commissioning of the facility expected in late 2022. The Multi-Purpose Detector (MPD) has been designed to operate at NICA and its components are currently in production. The detector is expected to be ready for data taking with the first beams from NICA. This document provides an overview of the landscape of the investigation of the QCD phase diagram in the region of maximum baryonic density, where NICA and MPD will be able to provide significant and unique input. It also provides a detailed description of the MPD set-up, including its various subsystems as well as its support and computing infrastructures. Selected performance studies for particular physics measurements at MPD are presented and discussed in the context of existing data and theoretical expectations