Conveners
Poster session: Modern nuclear physics methods and technologies
- Vitalii Petrov (St Petersburg State University (RU))
- Agniia Zviagina (St Petersburg State University (RU))
Application possibility of Library Least Square (LLS) approach in Prompt-Gamma Neutron Activation (PGNA) technique in bulk coal samples elemental analysis is investigated this work. 14 MeV neutrons were produced by a neutron generator via the T(d,n)4He reaction. A polyethylene block as a neutron moderator. The prompt gamma ray spectra from five different powders of pure compounds (namely...
The current developments in the field of very thin large area coordinate sensitive Si detectors for precise tracking of short-lived charged particles in future high-energy physics experiments requires the state-of-the-art solutions for systems of cooling, mechanics and engineering. This task represents a strong challenge due to contradictive demands of high thermo- and mechanical stability...
In August last year, the Radium Institute (ROSATOM) conducted an experiment on the extraction of transplutonium and lanthanides. In the experiment, a system consisting of centrifugal extractors was used, similar to the work [1]. To monitor the extraction of transplutonium elements, we used the estimation of the volume activity of solutions using gamma spectra from various stages of extractors,...
The results of an investigation of silicon carbide (SiC) detectors when irradiated with neutrons are presented. SiC detectors were manufactured on the basis of the epitaxial layer of 4H-SiC n-type conductivity [1, 2]. The thickness of n-type epitaxial layer was 25 µm. Schottky barrier contacts with a diameter of 3.0 mm were made by vacuum evaporation of a double layer of Ni and Au 10 and 20...
A compact calibration neutron source is highly required for a number of current and future nuclear and astrophysical experiments [1, 2]. An appropriate solution could be considered in a combination of $^{252}$Cf radionuclide source which undergoes $\alpha$-decay and spontaneous fission with a branching ratio of 97:3, whereas each spontaneous fission event liberates also a number of fast...
Using an autocorrelation delayed coincidence spectrometer [1], two types of time correlation of noise pulses associated with the photocathode and photomultiplier dynodes have been established. The time distributions of pulses from noise and external light sources in photomultiplier tubes ХР2020, ХР2232В, ХР1021, FEU-85, FEU-87, FEU-93, FEU-130, R7600U-200 have been studied. For some types of...
Enriched selenium used in low-background experiments [1] is expediently purified using ion exchange. This work is devoted to the study of the sorption of a number of traditional radioactive impurities in solutions of selenous acid on a cation exchange resin. The radioactive indicators Ra-223, Ac-225 and U-230 were obtained from a proton-irradiated thorium target [2]. The radionuclide Th-234...
The work is devoted to the EJ-276 plastic scintillator based neutron spectrometer with pulse shape discrimination (PSD) capability experimental development [1]. A DT neutron generator was used as a radiation source. The PSD method is carried out using a CAEN DT5730B digitizer.
An experiment was carried The maximum neutron flux density at which the spectrometric channel is capable to separate...
Tuning of the beam-beam collisions and fast, event-by-event monitoring are essential
both to achieve the high luminosity of colliders and to provide in the experiment the event selection, precise event timing information, determination of the event interaction point and the reaction plane, suppression of the beam-gas interaction events. To meet the challenges of the fast monitoring of the...
In the laboratory for the reprocessing of spent nuclear fuel (SNF, Radium Institute) a solutions of $^{238}$Pu - $^{239}$Pu with unknown concentration and relation of nuclides were studied. The research was carried out both on the laboratory equipment and the equipment of the metrological service of the Radium Institute. For alpha spectroscopy we used an ionization chamber and a PIPS detector,...
Cherenkov radiation detection is being used in the most experimental physics installations and, therefore, the detailed modeling to construct and study its properties is required. The methods of calculations in the time-spatial representation in the semiclassical approach were developed in [1-3] to simulate the electromagnetic field energy change in the passage of the primary particle and the...
Monitoring, Alarm and Control System for the ELIADE γ-ray spectrometer
G. Nitescu1, D. Testov1,2, F. Ramirez1
1 Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Romania
2 Joint Institute for Nuclear Research, Dubna
ELIADE (ELI-NP Array of Detectors) is the γ-ray spectrometer which will be used for Nuclear Resonance Fluorescence (NRF) studies at ELI-NP. The array consists of...
Use of PIN diodes in spectrometry of low heavy ions poses some methodological challenges. One of them is correctly accounting for the so-called plasma delay effect (PDE) which is due to generation of plasma in a heavy ion track in the PIN diode. The PDE prevents precise measurements of a particle’s time-of-flight (TOF). In this presentation, we discuss new algorithm of time pick-off when using...
The Short Range Correlation (SRC) program is the extension of the BM@N (Baryonic Matter at Nuclotron) experiment. It studies interactions of carbon beam with a liquid-hydrogen target. The data analysis in the SRC experiment requires a comparison of experimental data with Monte-Carlo information. Due to various reason the procedure of simulation doesn’t reproduce the experiment in some details....
The most reliable and long-term isolation of radioactive waste can be ensured by their burial in stable deep geological formations. The main factors which provide the stability of the geological formation during deep immobilization are absorbed by the protective container.
The natural quartzite was from the Ovruch deposit from the Ukrainian crystal shield. These natural quartzites were...
Gamma-spectrometric methods for measuring the content of radium-226 using a photopeak with an energy of 186 keV are well known. However, according to the complete decay scheme of radium-226, this gamma-ray photopeak accompanies the alpha decay of radium to radon with a low quantum yield for decay of 5.4%. An increase in the measurement error on a semiconductor gamma spectrometer is also due to...
Currently, devices that include electrophysical sources of neutron radiation, or, as they are also called, neutron generators, are widely used in applied research. Neutron radiation in these devices is obtained through the implementation of nuclear reactions such as d (d, 3He) n or d (t, 4He) n. Currently, generators based on sealed gas-filled neutron tubes (GFT) are becoming more and more...
The Multi-purpose Detector (MPD) is being created to study the properties of hot and dense nuclear matter at the interaction point of heavy ions beams at the NICA complex. The electromagnetic calorimeter in the new experimental setup is designed to identify photons and electrons by measuring their energy and coordinates, as well as separating them from hadrons. For the stable operation of...
L. Hrubčín1,2,a), B. Zat'ko1, Yu.B. Gurov2,3,
P. Boháček1, S.V. Rozov2, V.A. Skuratov2
1Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava, Slovakia;
2Joint Institute for Nuclear Research, Dubna, Russia;
3National Research Nuclear University (MEPhl), Moscow, Russia
a)Corresponding author: ladislav.hrubcin@savba.sk
In the last decade, silicon carbide (SiC)...
The territory of the Republic of Kazakhstan is characterized by a complicated radiation situation due to the active development of extractable natural resources (coal, non-ferrous metals and uranium), the geological features of the certain areas of ground surface, seismically activity and the highlands in the southern regions. In this context, radioactive gases and their decay products formed...
The study of environmental pollution processes is one of the geoecology’s key activities last decades. These studies are covered almost all components of the natural landscape. However, the most interesting results can be obtained during the study of the sediments samples taken from the different water objects. One of the fundamental issues in these investigations is to determine the age of...
The goal of the project is to investigate the new effect consisting in fission fragment's brake-up while passing the solid-state foil. According to the previous experiments [1-3], it is expected that masses of some brake-up residuals correspond to magic nuclei such as $^{128,132}Sn$ and $^{144}Ba$. The project aims to detect in coincidence all the products of fragment's brake-up using the...
Today’s searches of effective technology to deactivate irradiated reactor graphite are very acute due to the large volumes of accumulated irradiated graphite in the world (about 100 thousand tons) and the challenging problem of uranium-graphite reactors decommissioning period. It is also well known that 14C isotope makes the greatest contribution to the irradiated graphite residual activity...
The use of the gamma spectroscopy method for measuring the value of the indicator of the ratio of the activities of uranium and thorium A (U) / A (Th) makes it possible to estimate quantitatively the manifestations of various geological processes from the accumulation of thorium and uranium in the ore content to the formation of reservoirs favorable for the accumulation of hydrocarbons, and...
The aim of this study is to theoretically investigate radiation absorption parameters of six soil samples which have various depth as 0-10 cm, 10-30 cm, 30-50 cm, 50-70 cm, 70-100 cm and 100-200 cm. For this purpose, mainly used radiation absorption paramaters which are linear attenuation coefficient (LAC), mass attenuation coefficients (MAC), half value layer (HVL), tenth value layer (TVL),...
At present, the intrinsic energy resolution of a scintillation detector is understood by many authors differently. The terms of existing formulae for the energy resolution, on which the intrinsic energy resolution of the scintillation detector is determined, differ not only in their names, but also in the physical meaning of the processes they take into account. The main drawback of all...
In frame of the JINR scientific program on study dense baryonic matter a new accelerator complex the Nuclotron-based Ion Collider fAcility (NICA) is under realization at the Joint Institute for Nuclear Research (Dubna, Russia) [1]. Two interaction points are foreseen at NICA for two detectors. One of these detectors, the Multi-Purpose Detector (MPD), is optimized for investigations of...
The successful study and detection of radioactive nuclei, produced in nuclear reactions or transformations inside the body of a target source, is not solely dependent upon their high rates of production, but also from the high efficiency of transmission of the produced recoils through the target’s material. There exists an interest of correctly estimating the transmission efficiency of...
In high energy physic experiments the new detector complexes with large granularity and the highest radiation transparency should be used for tracking of charged particles, providing minimal distortions due to the multiple scattering effects. In this case the minimum material budget is required for all materials have to be used within the sensitive area of the detective volume. This means...
The serial of critical experiments of circle geometry were performed in 70th of the last century at Petersburg Nuclear Physics Institute of the Russian Academy of Science [1,2]. The reactor PIK fuel elements of reduced length were used. Along these experiments the size of the inner water trap were varied. The geometry and the nuclear content of the fuel element were carefully measured.
The...
