Physics of Atomic Nuclei最新文献

{"title":"PMT/WLS Plate Optical Modules for Cherenkov Detectors","authors":"Y. Stroke,&nbsp;G. Erofeev,&nbsp;S. Fedotov,&nbsp;A. Izmaylov,&nbsp;A. Khotjantsev,&nbsp;Y. Kudenko,&nbsp;O. Mineev,&nbsp;N. Shvarev,&nbsp;N. Yershov","doi":"10.1134/S1063778825600745","DOIUrl":"10.1134/S1063778825600745","url":null,"abstract":"<p>The aim of the study is to create an optical module made of a wavelength shifting (WLS) plate, an acrylic plate with a wavelength shifting dopant, and a photomultiplier (PMT) that meets the requirements for usage in water Cherenkov detectors. Preliminary results of the characteristics of PMT for usage as an element of a module with WLS plate are presented and the optimal design of the plate is developed. The choice of WLS dopants and their concentrations, as well as types of reflectors, are based on the tests performed. An assessment of the wavelength shifting plates’ aging properties was also done.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"482 - 488"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstruction of the Scalar-Torsion Gravity Version from the Frame of Exact Cosmological Solutions","authors":"I. V. Fomin,&nbsp;S. V. Chervon,&nbsp;E. S. Dentsel","doi":"10.1134/S1063778825600538","DOIUrl":"10.1134/S1063778825600538","url":null,"abstract":"<p>We consider cosmological models based on the scalar-torsion gravity implying non-minimal coupling between torsion and the scalar field with certain relations between model’s parameters. Based on observational constraints on the values of the parameters of cosmological perturbations, the type of the coupling was determined. It was noted that any inflationary models constructed on the basis of the proposed approach can be verified by observational constraints.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"494 - 499"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Search for Heavy Neutrinos Using T2K Near Detector ND280","authors":"K. Gorshanov,&nbsp;A. Izmaylov","doi":"10.1134/S106377882560068X","DOIUrl":"10.1134/S106377882560068X","url":null,"abstract":"<p>The presented analysis aims at study of heavy neutrinos <span>((N))</span> with masses <span>(m_{N}&lt;493text{ MeV/}c^{2})</span>. These particles can be produced in <span>(K^{pm})</span> and <span>(pi^{pm})</span> decays in the standard neutrino beam and then they subsequently decay in T2K’s near detector ND280. Considered heavy neutrino two- and three-body decay modes are <span>(Nrightarrow l^{pm}_{alpha}pi^{mp})</span>, <span>(Nrightarrow l^{+}_{alpha}l^{-}_{beta}nu(overline{nu}))</span>, where <span>((alpha,beta=e,mu))</span>. Search for these events is performed in Time Projection Chambers of ND280 in order to significantly reduce background from neutrino interactions. Usage of new tracking method in TPC among other reconstruction improvements, updated neutrino interaction model and additional statistics will allow to improve experiment sensitivity. Signal selection efficiencies and preliminary systematic uncertainties are shown.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"418 - 424"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neutrino Spin Oscillations near a Black Hole","authors":"Mridupawan Deka,&nbsp;Maxim Dvornikov","doi":"10.1134/S1063778825600770","DOIUrl":"10.1134/S1063778825600770","url":null,"abstract":"<p>In this work, we study neutrino spin oscillations in the case when they are gravitationally scattered off a rotating Kerr black hole surrounded by a thick magnetized accretion disk. We consider only toroidal magnetic field inside the disk. Neutrino spin precession is caused by the interaction of the neutrino magnetic moment with the magnetic field in the disk. Our treatment of spin oscillations of the observed neutrino fluxes, is based on numerical simulations of the propagation of a large number of incoming test neutrinos using High Performance Parallel Computing. We briefly discuss our results and their applications in the observations of astrophysical neutrinos.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"513 - 519"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of Lepton Tracks from Neutrino Events in the Upgraded ND280 Detector Complex of the T2K Experiment","authors":"A. Shvartsman","doi":"10.1134/S1063778825600952","DOIUrl":"10.1134/S1063778825600952","url":null,"abstract":"<p>The upgraded near neutrino detector of the T2K experiment is briefly described. The central part is the 3D scintillator fine-grained detector (SuperFGD). The detector comprised of about 2 million <span>(1times 1times 1)</span> cm<span>({}^{3})</span> plastic scintillator cubes with three orthogonal holes for wavelength shifting fiber readout. It will be used as an active neutrino target to detect charged particles and photons. A combination of SuperFGD with the other subdetector systems in the ND280 detector provides a possibility to detect more neutrino events (due to an additional active target), as well as to increase the accuracy of the neutrino events reconstruction. In this work, the results of Monte Carlo simulation of the interactions of electron and muon neutrinos in the updated ND280 complex are presented. The efficiency of matching tracks between SuperFGD and other subdetectors of the upgraded ND280 will be discussed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"425 - 429"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of the ({e^{+}e^{-}topi^{0}gamma}) Cross Section near the ({phi}{(1020)}) Resonance with the SND Detector","authors":"M. N. Achasov,&nbsp;A. Yu. Barnyakov,&nbsp;K. I. Beloborodov,&nbsp;A. V. Berdyugin,&nbsp;D. E. Berkaev,&nbsp;A. G. Bogdanchikov,&nbsp;A. A. Botov,&nbsp;V. S. Denisov,&nbsp;T. V. Dimova,&nbsp;V. P. Druzhinin,&nbsp;V. N. Zhabin,&nbsp;V. V. Zhulanov,&nbsp;I. M. Zemlyansky,&nbsp;L. V. Kardapoltsev,&nbsp;A. A. Kattsin,&nbsp;A. N. Kirpotin,&nbsp;D. P. Kovrizhin,&nbsp;I. A. Koop,&nbsp;A. A. Korol,&nbsp;A. P. Kryukov,&nbsp;A. S. Kupich,&nbsp;N. A. Melnikova,&nbsp;N. Yu. Muchnoi,&nbsp;A. E. Obrazovsky,&nbsp;I. V. Ovtin,&nbsp;A. A. Oorzhak,&nbsp;E. V. Pakhtusova,&nbsp;E. A. Perevedentsev,&nbsp;K. V. Pugachev,&nbsp;Yu. A. Rogovsky,&nbsp;S. I. Serednyakov,&nbsp;Z. K. Silagadze,&nbsp;I. K. Surin,&nbsp;M. V. Timoshenko,&nbsp;Yu. V. Usov,&nbsp;L. B. Fomin,&nbsp;A. G. Kharlamov,&nbsp;Yu. M. Shatunov,&nbsp;D. A. Shtol,&nbsp;E. A. Eminov","doi":"10.1134/S1063778825600885","DOIUrl":"10.1134/S1063778825600885","url":null,"abstract":"<p>The <span>(e^{+}e^{-}topi^{0}gamma)</span> cross section has been measured in the center-of-mass energy range from 1000 to 1060 MeV with the SND detector at the VEPP-2000 electron-positron collider. At the maximum of the <span>(varphi)</span>(1020) resonance the systematic uncertainty of the cross section measurement is 1.3%, and the statistical uncertainty is 2.2%. To date, this is the most accurate measurement of the <span>(e^{+}e^{-}rightarrowpi^{0}gamma)</span> cross section. As a result of data approximation with the vector dominance model the decay branching ratio <span>(B(phitopi^{0}gamma)=(1.452pm 0.024pm 0.067)times 10^{-3})</span> has been measured.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"453 - 463"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation of Dark Atoms","authors":"Vitaly Beylin,&nbsp;Maxim Khlopov,&nbsp;Danila Sopin","doi":"10.1134/S1063778825600903","DOIUrl":"10.1134/S1063778825600903","url":null,"abstract":"<p>New stable heavy particles with even negative charge <span>(X^{-2n})</span> arise in several extensions of the Standard Model. The Thomson-like neutral bound states <span>(X)</span> He called dark atoms can be dark matter candidates, explaining the puzzles of direct dark matter searches. However, at present there is no comprehensive description of their formation at early stages of the cosmological evolution. The process of the <span>(X^{-2n})</span> excess generation depends significantly on a model, pending on the electroweak properties of <span>(X)</span>-particles. If these particles have nontrivial <span>(SU(2))</span> electroweak charges, such excess can be balanced with baryon asymmetry by sphaleron transitions. The successive development of the nucleosynthesis, modified by the presence of dark atoms, is determined by their nuclear interaction with the baryonic matter. We approach these open questions of dark atom cosmology in the present work.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"535 - 539"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generation of the Resonant Magnetic Fields in the T-15MD Tokamak","authors":"P. V. Savrukhin,&nbsp;E. A. Shestakov,&nbsp;V. I. Tepikin","doi":"10.1134/S1063778825130113","DOIUrl":"10.1134/S1063778825130113","url":null,"abstract":"<p>Requirements for generation of the resonant magnetic fields in tokamaks for controlling magnetohydrodynamic (MHD) plasma perturbations, stabilizing edge localized modes (ELM), and suppressing accelerated electron beams are considered. A preliminary design of a system for generating external resonant magnetic fields on the T-15MD tokamak is considered. The design is based on a system of 48 multipole coils located inside a vacuum vessel (16 windings around the equatorial plane, 16 windings in the upper cone, and 16 windings in the lower cone) to create resonant magnetic fields with poloidal and toroidal harmonics <i>m</i> = 1–8, <i>n</i> = 1–4.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1 supplement","pages":"S13 - S20"},"PeriodicalIF":0.4,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145142369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical Analysis of Similarity of Profiles of Plasma Parameters at Quasi-Stationary Stage of Discharges in Globus-M2 Tokamak","authors":"G. S. Kurskiev,&nbsp;P. A. Sdvizhenskii,&nbsp;N. S. Zhiltsov,&nbsp;E. E. Tkachenko,&nbsp;N. V. Teplova,&nbsp;G. A. Troshin,&nbsp;A. K. Kryzhanovsky,&nbsp;A. B. Kukushkin,&nbsp;A. V. Sokolov,&nbsp;V. V. Voloshinov","doi":"10.1134/S106377882513006X","DOIUrl":"10.1134/S106377882513006X","url":null,"abstract":"<p>The similarity of spatial profiles of electron temperature <i>T</i>_e and electron density <i>n</i>_e at the quasi-stationary stage of electric current in plasma in 21 discharges in the Globus-M2 tokamak have been statistically analyzed. The analysis is similar to that carried out earlier with JET tokamak data. The existence of universal profiles of <i>T</i>_e and <i>n</i>_e depending on the normalized minor radius of the plasma column ρ has been shown. The discharge universal profiles (DUPs) are obtained by dividing the space-time-dependent profile by the space-averaged value of this parameter in the region ρ ≤ ρ_max = 0.5–1 and subsequent averaging over time at the quasi-stationary stage of each discharge. The machine universal profiles (MUPs) are obtained by additional averaging over time of all discharges. It has been shown that, in all considered discharges, the time-averaged <span>({{{{tilde {sigma }}}}_{{{{T}_{{text{e}}}}}}})</span>, the relative root-mean-square deviations of the <i>T</i>_e profile from the DUP and MUP, at ρ_max = 0.8 on radii of ρ = 0.1–0.7 do not exceed 10%, and at ρ = 0.9, accuracy decreases. Similar values of spatially averaged <span>({{{{tilde {sigma }}}}_{{{{T}_{{text{e}}}}}}})</span> exceed 10% only at one of 136 time points of all considered discharges. A similar picture has been observed for <i>n</i>_e profiles. A comparison of the MUP for <i>T</i>_e in JET and Globus-M2 has shown some difference in profiles, maximal at small ρ. Using the SvF method of balanced identification, the accuracy of the representation of <i>T</i>_e(ρ, <i>t</i>) as the product of two functions of only one variable, time and coordinate, has been found. The results illustrate the high degree of plasma self-organization in tokamaks.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1 supplement","pages":"S29 - S40"},"PeriodicalIF":0.4,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145142673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of the Sputtering Rate of the Tokamak First Wall by Atoms of Hydrogen Isotopes in the Near-Wall Plasma","authors":"R. I. Khusnutdinov,&nbsp;N. E. Efimov,&nbsp;I. A. Nikitin,&nbsp;Yu. M. Gasparyan,&nbsp;A. B. Kukushkin","doi":"10.1134/S1063778825130046","DOIUrl":"10.1134/S1063778825130046","url":null,"abstract":"<p>A method for calculating sputtering of the tokamak first wall by fast charge-exchange neutral atoms of hydrogen isotopes in the near-wall plasma has been proposed. The application of the method has been shown by the example of sputtering of the assumed first-wall materials under the near-wall plasma conditions in the ITER tokamak. Using the BM1D2V code based on the ballistic model of hydrogen recycling kinetics in the tokamak main vacuum chamber, the velocity distribution function (VDF) of neutral atoms and molecules of hydrogen isotopes in the near-wall plasma has been calculated. Using the calculated VDFs, the sputtering rate of beryllium, tungsten, and boron from the surface of the first wall of the tokamak vacuum chamber in a typical ITER divertor operating mode has been estimated. The reflection coefficients of atoms of hydrogen isotopes from the first wall used in the ballistic model and the sputtering coefficients have been calculated using the SDTrimSP code.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1 supplement","pages":"S101 - S111"},"PeriodicalIF":0.4,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145142675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}