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Vol 88, No 2 (2025)
ЯДРА. Эксперимент
Diagnostics of the structure of a nuclear power plant unit using muonography
Abstract
In 2022, a hybrid muon hodoscope with a sensitive area of 3 × 3 m2 for studying the internal structure of large-scale objects using the muonography method was created at MEPhI. The hodoscope’s detecting system has a hybrid structure. It consists of a scintillation strip detector and a drift tube detector and is designed to record tracks of charged particles. The muonography method is based on the use of cosmic ray muons as penetrating radiation for “translucence” (analogous to radiography) of large-scale objects. Experimental studies of the internal structure of the Kalinin NPP power unit using the muonography method were carried out in 2022–2023. The paper presents a brief description of the design of a hybrid muon hodoscope, as well as the results of an experiment on diagnostics of the power unit structure using this method, which was carried out during the scheduled power unit’s maintenance. The purpose of the experiment was to develop a method for real-time detection of changes in the structure of a reactor unit during its maintenance.
169-184
Optimization of the composition of Nd-containing scintillator to increase its light output and stability
Abstract
Based on Nd(III) 3,5,5-trimethylhexanoate and an additional solvent TBP, the composition of a liquid organic scintillator for the determination of double neutrinoless β-decay was developed in LAB. IR spectroscopy has shown that TBP forms additional coordination bonds with neodymium carboxylate and thereby prevents its hydrolysis and polymerization. It has been shown that the optimal method for studying the purity and stability of a scintillator is UV spectrophotometry. The light yield of the scintillator composition [LAB + BPO (3 g/l) + TBP (6.3%) + Nd (5.9 ± 0.2 g/l)] is 78% relative to the scintillator [LAB + BPO (3 g/l)].
185-196
ЯДРА. Теория
Properties of the “remote” even–even nuclei close to 78Ni
Abstract
In this paper, in the framework of the random phase approximation, we investigate the properties of even–even nuclei in the vicinity of the “remote” doubly-magic nucleus 78Ni. The energies of the levels and probabilities of electromagnetic transitions in the considered nuclei have been calculated. A comparison of the obtained results with the currently available few experimental data has been carried out.
197-202
Masses of 92 1s-hadrons in the chiral invariant phase space model
Abstract
In the Chiral Invariant Phase Space Model, the constituent quarks of hadrons are surrounded by nonperturbative vacuum with the boiling temperature Tc. The color-electric binding energy ECE is proportional to the reduced energy of quarks εij. The spin-products of the color-magnetic splitting ECM are calculated according to the simplified rules of para-statistics. The masses of the 61 hadrons are fitted by 8 parameters including the Tc value and the 5 masses of quarks. The masses of 21 hadrons are predicted including hadrons with two and three heavy quarks.
203-214
PROCEEDINGS OF 74TH INTERNATIONAL CONFERENCE ON NUCLEAR PHYSICS “NUCLEUS-2024: FUNDAMENTAL PROBLEMS AND APPLICATIONS”, 1–5 JULY 2024, DUBNA, RUSSIA. Nuclei. Theory
215-219
PROCEEDINGS OF 74TH INTERNATIONAL CONFERENCE ON NUCLEAR PHYSICS “NUCLEUS-2024: FUNDAMENTAL PROBLEMS AND APPLICATIONS”, 1–5 JULY 2024, DUBNA, RUSSIA. Elementary particles and fields. Experiment
Determining low-energy characteristics of the pp interaction in the d + 1H → p + p + n reaction
Abstract
The study results of the d + 1H → p + p + n reaction are presented. A kinematically complete experiment with using a deuteron beam energy of 15.3 MeV at the U-120 accelerator of the MSU SINP was carried out. A proton from the breakup of the singlet pp state and a secondary neutron were registered in coincidence. As a result of the study, the low-energy characteristics of pp interaction, namely, the energy value of the virtual singlet pp state and the corresponding value of the pp scattering length were determined.
220-227
Neutron–proton scattering length data extracted from the n + 2H → n + n + p reaction at En = 5 MeV
Abstract
The nd breakup reaction at an energy of 5 MeV was studied on the RADEX neutron channel of the INR RAS. As a result of comparing the experimental data with the simulation results, the energy of the virtual 1S0 np state Enp = 40 ± 2 keV and the corresponding singlet np scattering length anp = −30.9 ± 0.8 fm were extracted. It was assumed that the obtained anp value, together with the data of other experiments on the study of nd and dd breakup reactions at different energies, are subject to the influence of 3N forces. The work was carried out as part of a series of studies on internucleon interactions at low energies.
228-236
Study of reactions induced by fast neutrons on 10B nucleus with tritium emission using coordinate detector
Abstract
The interaction of fast neutrons with the 10B nucleus at energies from 3 to 7 MeV is studied with the aim of isolating the reaction with the production of the 8Be* nucleus in an excited state. This reaction stands out from the three-body reaction with the emission of triton and two α-particles. Simulation of ionization losses of secondary 3H and 4He nuclei in solid and gas layers of position-sensitive multiwire detectors with sensitive sizes both a 100 × 100 and 50 × 50 mm2 showed that events are localized in different areas in diagrams plotted from losses in two gas layers. Experimental result with 100 × 100 mm2 detector showed the possibility of isolating a reaction with the emission of 3H and 8Be* nuclei.
237-242