Natural Sci. Rev. 2 100305 (2025) DOI: 10.54546/NaturalSciRev.100305
Natural Sci. Rev. 2 100304 (2025) DOI: 10.54546/NaturalSciRev.100304
3D segmented neutrino detector SuperFGD
The near neutrino detector ND280 of the long-baseline accelerator experiment T2K has been upgraded to improve the precision of measurement of the neutrino oscillation parameters. A key component of the upgrade is a novel segmented plastic scintillator detector, Super Fine Grained Detector (SuperFGD), made of approximately 2 million optically isolated 1 cm 3 cubes read out by three orthogonal wavelength-shifting fibres and multi-pixel photon counters. The SuperFGD provides 3D images of neutrino interactions by tracking the final-state charged particles including protons down to a threshold of about 300 MeV/c. Due to the fine segmentation and the sub-nanosecond time resolution, the SuperFGD is able to detect neutrons from neutrino interactions and to reconstruct their kinetic energy by measuring the time of flight. In this paper, the details of the detector design, construction and performance in the T2K neutrino beam are described.
Natural Sci. Rev. 2 100303 (2025) DOI: 10.54546/NaturalSciRev.100303
Characterization of micro-SPECT system based on Timepix detector
In this work, the characteristics of a prototype SPECT system based on the Timepix readout chip, with a MURA-type encoding mask, were evaluated. The setup has a small FoV and can be used in preclinical studies of drugs on small laboratory animals. Despite many existing test protocols developed and described in pertinent documents of national standard bodies and IAEA recommendations, they are not suitable for microtomographic systems based on semiconductor pixel detectors due to different detector technology, high spatial resolution and small area of interest. To measure their characteristics, special phantoms were developed, with a small “hot region”. Such micro-SPECT parameters as spatial resolution, contrast, linearity, and system efficiency were studied using 99m Tc source. The detector calibration and data preprocessing are described.
Natural Sci. Rev. 2 100302 (2025) DOI: 10.54546/NaturalSciRev.100302
Bogoliubov method in description of nuclear rotation
The problem of identifying and extracting the dynamic variables associated with symmetry transformations from the full set of dynamic variables is considered. It is demonstrated that employing a boson representation of bifermion operators enables the problem to be solved using the canonical transformation of dynamic variables proposed by N. N. Bogoliubov. The results obtained justify the application of the cranking model for the description of the rotational excitations of nuclei.
Natural Sci. Rev. 2 100301 (2025) DOI: 10.54546/NaturalSciRev.100301
