3^{3}HeDetectors in Experiments at the Powerful Pulsed Accelerators

A possibility of using a thermal neutron detector in the high gammaquantum and bremsstrahlung fields is considered. The design of the thermal neutron detector consisting of 10 counters filled with ^{3}He under the pressure of 2 atm and enclosed in the polyethylene moderator is described. The results of measuring the neutron recording efficiency and neutron lifetimes by this detector exposed to a neutron flux from the dtreaction and from the ^{252}Cf and PuvBesources are reported. The thicknesses of the polyethylene moderator and the Pblayer used for suppression of the background in the fields of powerful electromagnetic radiation are optimized

Deuterium Liner and Multiparameter Investigation of the Inverse ZPinch Formation Process

A description of the methods and results of the measurements of the ion energy distribution of the deuterium liner accelerated in the inverse Zpinch configuration are presented the liner plasma is radially accelerated from the outward small radius. The knowledge of the experiment deuteron energy distribution is crucially important for correct interpretation of the results on the study of the ddreaction at infralow collision energies using the liner plasma. Experiments were fulfilled in the HCEI (Tomsk, Russia) at a nanosecond pulsed high current generator (I=950 kA, pulse duration \tau=80 ns). The hollow deuterium liner of 20 mm length was accelerated from the initial radius of \sim 15 mm to 45 mm. Measurement of the liner characteristics was produced by means of the light detectors (detection of H_\alpha and H_\beta deuterium lines) and magnetic Bdot probes, placed on the various radii of the expanding liner. Besides, the measurement of the neutron radiation intensity due to reaction d+d\to^{3}He+n was fulfilled. The results of the investigations have shown the possibility of applying a sufficiently simple method for measurement of liner parameters accelerated up to energy 36 keV, by using the joint data analysis obtained by means of the magnetic probes, optical sensors and neutron detectors

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