Today the studies of the hadron yields containing heavy quarks are of particular interest for high-energy physics. These yields are characterized by small cross-sections for interaction with the nuclear medium. As a result, for the processes of relativistic nuclear collisions the information about the states of nuclear matter (arising in such processes) could be obtained. In this case, the...
After BM@N technical run in spring 2018, the first physical stage of the experiment will begin in 2021. For stop time Silicon tracking modules of BM@N Forward Silicon Detector are applied at muon stand to test and measure R-t characteristics of straw detectors (6 mm diameter, produced by JINR, Dubna) by reconstructing cosmic rays tracks (based on bmnroot software). Muon stand consists of...
The BM@N is a fixed target experiment for studies of baryonic matter at the Nuclotron (JINR, Dubna). According to upgrade plans for BM@N, vacuum beam pipe will be added into experimental setup. To determine the coordinates of incident “trigger ion” and to tune the beam, it is necessary to develop three coordinate stations of beam tracker and two coordinate stations of beam profilometer...
BM@N (Baryonic Matter at Nuclotron) is the first experiment to be realized at the accelerator complex of NICA-Nuclotron at JINR (Dubna). The aim of the experiment is to study interactions of relativistic heavy ion beams with a kinetic energy from 1 to 4.5 AGeV with fixed targets.
In the report an algorithm for global tracks reconstruction in the BM@N experiment are described. The core of the...
BM@N experiment of the NICA accelerator complex at the Joint Institute for Nuclear Research, Dubna is aimed at studying heavy ion collisions with fixed targets. The BmnRoot software package [1, 2] is used in the BM@N experiment and it plays a crucial role both in event simulations and in track and event reconstruction [3]. Event reconstruction may take significant time per event. Time of...
BM@N experiment at Nuсlotron in Dubna is currently being upgraded for the study of dense nuclear matter in heavy-ion collisions. One of the major upgrades is a new hybrid tracking system consisting of large-area Silicon Tracking System (STS) with fast data-driven readout to be installed in-front of seven GEM planes currently partially installed. The STS contains of four position-sensitive ...
In order to study the high-density nuclear equation-of-state in collisions between gold nuclei at Nuclotron beam energies (2– 4.5A GeV), the existing BM@N experiment at JINR in Dubna has to be substantially upgraded. The measurement of high-multiplicity events at interaction rates up to 5 MHz requires the installation of four new tracking stations equipped with double-sided micro-strip silicon...
Today the silicon-based detector systems are playing a key role in experimental studies of the nuclear matter properties. Using thin silicon pixel detectors for the precise identification of charged particles opens completely new opportunities to investigate the states of nuclear matter arising in processes of relativistic nuclear collisions. For stable operational conditions of such...
CLAS Physics Data Base (CLAS DB) has been developed in collaboration between the SINP at MSU and the Hall B at Jefferson Lab [1,2]. CLAS DB contains most experimental results on inclusive semi-inclusive and exclusive reaction off proton and nuclei obtained with the CLAS detector. The substantial part of these experimental results represent the only available in the world data sets. The results...
Nickel-63 is perspective isotope to produce microsized radioisotope power source [1]. Advantage of nickel-63 is combination of long half-life (T1/2 = 100 y), low beta-particle energies and absence of accompanying gamma-emissions. In industry nickel-63 is produced by nuclear reactor irradiation of nickel-62 [2].
Nickel-63 has been produced with nuclear power plant irradiation of nickel-62....
The spatial distribution of neutrons with the maximum energies from 3.3 to 5.3
MeV was investigated using a two-coordinate 10B detector. The detector was
located at the 119 cm distance from the 1000 cm3 beryllium target at the output of
on electron accelerator based photoneutron source. Between the 10B detector and
the target the collimator of 3 cm diameter was located. The contribution of...
There are serious contradictions in the theoretical and experimental data on the prompt fission neutron spectra for a number of fissile isotopes. Particularly large discrepancies are observed in the experimental data for the region of low (<0.5 MeV) and high (> 6 MeV) neutron energies. This is due to the large influence of systematic errors on the results of the neutron spectra measurements...
The possibility of control the maximum energy in the neutron flux by analyzing the pulse height spectra of the $^{10}$ B-detector [1] was investigated. Two possible nuclear reactions were considered: direct reaction and reaction throuh the exited $^{11}$B* nucleus with the production of $^{4}$He and $^{7}$Li. The ionization losses of nuclei in two detector gaps were calculated. A change in the...
Under developing new position-sensitive ionization detector of fast neutrons with energies above 1 MeV events of $^{7}$Li and $^{4}$He nucleus emission from $^{10}$B layer is simulated. Detector gives possibility to determine direction of nucleus emission due to signals from anode and pairs of cathodes and grids. Ionization signals from detector gas gaps is proportional to the partial and...
In [1], a laser plasma with electron temperature $\Theta_{e}$ ~ 1 keV and the lifetime of $\tau$ ≈ 0.5 ns was formed from rhenium metal containing ${}^{186m}$Re isomer nuclei ($T_{1/2}$ = 2×$10^{5}$ years) with an isomer concentration of ~ $10^{–3}$ %. In this plasma the stimulated de-excitation of ~ $10^{–5}$ % isomeric nuclei was observed. The experimental results made it possible to assume...
It is expected that PIK reactor, being a powerful source of neutrons, will be able to produce exotic neutron-rich nuclides in quantities greater than ever achievable or expected at other planned facilities. If one use extremely sensitive equipment, synergy can be achieved in the study of the properties of nuclides, including as yet unknown ones. Such extraordinary sensitivity on the level of...
One of the numerous perspective experimental implementations of the high-flux PIK- research reactor in Gatchina (Russian Federation) is connected with high-precision mass spectroscopy measurements, at the future planned facility PITRAP[1], of beta-unstable short-lived exotic nuclides. The study and measurement of the basic physical properties of exotic nuclides far from the line of stability...
Penning trap is a powerful device for measuring properties of ions and
subatomic particles. Presently it can reach the highest accuracy in a
determination of the mass of a nuclide.
The typical Penning-trap system for on-line mass measurements requires two
dedicated traps. The first trap – preparation trap (PT) – serves for the
purification and cooling of the captured ions via the...
The GALS set-up [1] uses a high-pressure gas cell for stopping heavy ion reaction products. In the dense ionized medium initially high-charged reaction products thermalize and neutralize. By the gas flow they move to the electrically isolated ion-free region, where part of them selec-tively reionize using three step laser resonant ionization process.
To perform an effective mass...
The experiment directed to the study of a new carbon nanomaterials application was performed on the U-400M heavy ion beam at MASHA facility, FLNR, JINR. In the present speech a new technical improvements will be discussed such as usage of thin carbon nanotubes paper (thickness 6.4 mg/cm2) and graphene (thickness 1.1 mg/cm2) in reaction products catcher block unit. The main goal of the...
During the radiometry of emission fluxes by recording the sequence of counts $\textit{K}({\Delta}{t})$ in time intervals ${\Delta}{t}$ the procedure of forming the sequence of random vectors $(n_{0}{...}n_{i}{...}n_{l})_j$ is performed, where $n_{i}$ $(k_{i}=i)$ is a random number of equal values of $k_{i}$ in one random sample of the size $n=n_{0}+{...}n_{i}+{...}n_{l}$. With a small sample...
Manufacturing of ionizing radiation source Ir-192 activity 50100 Ci has been begun that 20-30 pieces of disks of natural iridium (=2.7 mm, h=0.2 mm, m=31.7 mg) was placed in aluminum foil packing, then aluminum container with packaging in vertical channel of the WWR-SM reactor was irradiated by neutrons at following regime: special container EK-10 with iridium disks loading place is into...
A W-Be-photoneutron neutron source IN-LUE based on a linear electron accelerator was created and installed at the Institute for Nuclear Research of RAS [1]. The shape of the neutron spectrum and flux estimation was obtained earlier as a result of simulation [2]. Due to the impossibility of measuring the neutron spectrum in a wide range of energies within the source, various methods of spectrum...
The article describes the main characteristics of small-sized semiconductor spectrometers for performing real-time measurements directly in the channels of nuclear physics facilities and the results of their application.
Variants of using such spectrometers in experiments on an electron accelerator are considered.
The aim of this work was to measure the parameters of Si detectors and study their dependences on the bias voltage. It was measured the amplitude and time resolution, signal-to-noise ratio in the fast and slow channels, the value of the signal front and surface temperature for each detector.
When studying reactions on light nuclei at the SINP accelerator we use a two-arm spectrometer...
The current theory of scintillation spectrometers with one photodetector, the quintessence of which is generalized in the book [1], has a number of fundamental drawbacks. The correct mathematical description of the process of converting the energy of a primary particle into the signal at the output of a scintillation spectrometer allows overcoming these drawbacks. In this work, the...
Detection efficiency of a stilbene based neutron detector at neutron energy at 14 MeV for different amplitude thresholds is presented. Experiment was performed in Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research, Dubna, Russia using the VNIIA ING-27 generator of 14 MeV neutrons. Comparisons of the calculated neutron energy spectra with experimental data induced...
The new semiconductor detectors, which, based on CdZnTe crystals and CeBr3
scintillator, are presented in this work. The spectroscopic setup for testing measurements
was created, which consists of CdZnTe, CeBr3, and Si (measuring α and γ)
detectors. The main characteristics of these detectors including enegy resolution
FWHM/Eγ (keV) and efˇciency ε(%) were investigated and determined....
As part of the preparations for the LHC Run 3 and 4, the ALICE experiment at CERN is undertaking a thorough upgrade of the setup. In particular, all ALICE subsystems have to cope with the increased interaction rate of 50 kHz in Pb-Pb and up to 1 MHz in pp collisions. Compared to Run 2, this is up to two orders of magnitude more collisions. Although the solution for the majority of ALICE...
The radiation processing of food products is one of the most effective and universal technologies for extending the shelf life of meat and meat products during storage [1-4]. More than 1.3 million tons of various agricultural and food products, including meat, are irradiated annually in the world [5,6].
Currently, it has become a priority to optimize the exposure parameters, such as...
Ionizing radiation is commonly used to suppress the activity of phytopathogens in foodstuffs [1-3]. According to international standards, electron linear accelerators (linacs) with the energy up to 10 MeV are recommended as a safe and reliable technic for irradiation treatment of a wide range of agricultural products [4-6].
It is known that 10 MeV electrons have the penetration depth up to 10...
In nuclear and high energy physics many processes have statistical nature. In current paper statistical data analysis is considered in a nuclear spectrometry problem of radioactive element masses estimation.
The problem was solved independently by means of R programming language and using ROOT package libraries. Based on the lines of calibration Eu-152 and Am-241 sample, several variants of...
The nuclear isomeric state ${}^{186m}$Re with an energy of 149 keV and a half-life of 2×$10^{5}$ years is of great interest for experiments on the stimulation of de-excitation of nuclear isomers in plasma [1, 2]. In this work, the possibility of reactor production of a substance with a high concentration of ${}^{186m}$Re isomer is considered. A cross section of about 0.3 barn of excitation of...
The reactor production of the nuclear high-spin isomer ${}^{178m2}$Hf ($T_{1/2}$ = 31 years) was considered. According to [1], in the inelastic scattering of neutrons by ${}^{178}$Hf and in the (n, 2n) reaction by ${}^{179}$Hf, the ${}^{178m2}$Hf isomer is not formed, because this requires the transfer of too large angular momentum to the nucleus. For the formation of the ${}^{178m2}$Hf in the...
"Hot" particles have formed as a result of nuclear weapon testing, accidental releases at nuclear facilities, etc. In studying them much attention is paid to the analysis of transuranic elements (TUE) because they are long-lived alpha-emitting radionuclides, especially $^{238,239,240}$Pu and $^{241}$Am. The current accumulation and increase of the TUE content in the environment require to...
Existing chemical procedures are characterized by ambiguity in determining the content of rhenium due to competing manifestations of other elements. There is a need to develop independent methods for the analysis of rhenium-containing rocks. The complexity of this analysis also lies in the presence of naturally radioactive elements in the samples.
The composition and content of...
Of great interest are nuclides, in which there are excited state with extremely low energies, within the scale of e few eV or keV: 201Hg, 189Os, 237Np, 235U, 229Th and other nuclides. Such levels are isomeric owing to small their energies. They effectively mix up with close atomic levels, forming resonances in the optical domain [1]. This gives the chance to operate with the lifetimes of these...
The experiment was carried out at the electron accelerator (JINR, Dubna).
We studied the reaction products inside thin ${}^{238}$U sample irradiated by secondary gamma created from lead target by electron beam [1,2].
The mass distribution of uranium fission products on electron beam at energy of 140 MeV is shown in Fig. 1.
Fig. 1. Fission product yield of ${}^{238}$U on electron beam...
The Penning-trap mass spectrometer Pentatrap [1] located at the Max Planck Institute for Nuclear Physics in Heidelberg recently proved its capabilities performing first mass-ratio measurements with a relative uncertainty in the $10^{−11}$ regime using highly charged ions of $^{187}$Re [2] and different xenon isotopes [3]. Pentatrap will continue with mass measurements of dedicated nuclides...
