Physics of Atomic Nuclei最新文献

{"title":"Search for Light Sterile Neutrinos","authors":"Igor Alekseev","doi":"10.1134/S1063778825602173","DOIUrl":"10.1134/S1063778825602173","url":null,"abstract":"<p>Neutrino physics is one of the rare sectors of the modern physics, where there are experimental discrepancies with the Standard Model (SM) with statistical significance exceeding 5 sigmas. Oscillations between 3 active neutrinos are already well established experimentally and measured with percent precision. This settles a minimal extension of SM, which introduces massive neutrinos. This paper reviews the current experimental situation in the search for an effect which is well beyond SM. Three groups of anomalies could be considered: an appearance anomaly, which occurs when accelerator experiments find an excess of electron neutrino observed in the mainly muon neutrino beam; a gallium anomaly, when a shortage of neutrinos from a radioactive source is observed in gallium-based neutrino detection experiments; a reactor antineutrino anomaly, when a shortage of reactor antineutrinos is observed. A possible explanation of all these anomalies could be neutrino oscillation to a new, so-called sterile, state with mass <span>({sim}1)</span> eV, giving oscillations with characteristic <span>(L/Esim 1)</span> m/MeV.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S281 - S291"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579190","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":"The Photoabsorption Cross Sections for ({}^{{130,132}})Sn","authors":"N. N. Arsenyev,&nbsp;A. P. Severyukhin","doi":"10.1134/S1063778825602240","DOIUrl":"10.1134/S1063778825602240","url":null,"abstract":"<p>The <span>(E1)</span> strength distributions of <span>({}^{130,132})</span>Sn are studied. The coupling between one- and two-phonon terms in the wave functions of <span>(1^{-})</span> states is taken into account within the quasiparticle–phonon model based on the Skyrme energy density functional. The new calculation is extended by enlarging the variational space for the <span>(1^{-})</span> states. We found a reasonable agreement between the <span>(E1)</span> strength distribution, obtained within the model and the experimental data. It is shown that the inclusion of two-phonon configurations gives a considerable contribution to the low-energy <span>(1^{-})</span> spectrum.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S245 - S250"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579260","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":"Results of the Development of the SPHERE-3 Detector for Studying the PCR Mass Composition in the 1–1000 PeV Energy Range. The Status of 2025","authors":"D. V. Chernov,&nbsp;E. A. Bonvech,&nbsp;O. V. Cherkesova,&nbsp;E. L. Entina,&nbsp;V. I. Galkin,&nbsp;V. A. Ivanov,&nbsp;T. A. Kolodkin,&nbsp;N. O. Ovcharenko,&nbsp;D. A. Podgrudkov,&nbsp;T. M. Roganova,&nbsp;M. D. Ziva","doi":"10.1134/S1063778825602239","DOIUrl":"10.1134/S1063778825602239","url":null,"abstract":"<p>The SPHERE-3 setup is destined to register the EAS Cherenkov light (CL), both the direct and the reflected from the snow surface. A set of methods and new approaches in the measurement technique enable substantial progress in the study of the primary cosmic ray composition in the energy range 1–1000 PeV. The present work reveals the current status of the project development and detector performance modelling.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S267 - S273"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579629","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":"Production of Heavy Quark Bound States in Rare Exclusive Decays of Higgs Boson","authors":"F. A. Martynenko,&nbsp;A. P. Martynenko,&nbsp;A. V. Eskin","doi":"10.1134/S1063778825602392","DOIUrl":"10.1134/S1063778825602392","url":null,"abstract":"<p>The processes of pair production of <span>(S)</span>- and <span>(P)</span>-wave charmonium, as well as the production of the tetraquark <span>((ccbar{c}bar{c}))</span> in the Higgs boson decays are investigated within the framework of relativistic quark model. Relativistic decay amplitudes are constructed and decay widths are calculated taking into account relativistic corrections both in the decay amplitude and in the wave function of mesons.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S431 - S438"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579630","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":"The Process of the Z-Boson Decay into Two Leptons and Photon and Charge Asymmetry","authors":"A. G. Kharlamov,&nbsp;T. A. Kharlamova,&nbsp;P. A. Krachkov,&nbsp;V. N. Zhabin,&nbsp;A. S. Kupich","doi":"10.1134/S1063778825602422","DOIUrl":"10.1134/S1063778825602422","url":null,"abstract":"<p>The paper is devoted to the interpretation of experimental data from the ATLAS detector on the decay of the <i>Z</i>-boson into two leptons and photon. The main interest is in the distribution over the lepton and photon invariant mass. In this paper, we compare it with another modern generator that includes electroweak corrections—ReneSANCe. We consider the experimentally obtained asymmetry between the distributions of the invariant masses <span>(M(l^{+}gamma))</span> and <span>(M(l^{{-}}gamma))</span> and compare it with the result from ReneSANCe. We also propose taking into account previously measured angular coefficients to improve the description of the initial state of the <i>Z</i>-boson, produced in <i>pp</i> collisions.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S337 - S342"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579121","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":"Mean Depth of Shower and Interaction Characteristics","authors":"Lev Kheyn","doi":"10.1134/S1063778825602434","DOIUrl":"10.1134/S1063778825602434","url":null,"abstract":"<p>Analytical expression for the mean shower length of the shower produced by the proton in air, obtained with use of the cascade theory, is used for studying connection of the hadronic interaction characteristics with the longitudinal shower development. Two hadronic generators, EPOS-LHC and QGSJETII-04, are intercompared. It is analyzed how interaction characteristics are related to the difference in the mean shower length energy dependence. Results of the calculations are also compared with results of simulations.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S343 - S349"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579135","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":"The Search of the Process ({e^{+}e^{-}to(omega,rho)toeta e^{+}e^{-}}) at 680–820 MeV c.m. Energy Range with the CMD-3 Detector","authors":"D. N. Grigoirev,&nbsp;V. F. Kazanin,&nbsp;V. L. Ivanov,&nbsp;A. N. Narvatkina,&nbsp;D. V. Shoukavy","doi":"10.1134/S1063778825602379","DOIUrl":"10.1134/S1063778825602379","url":null,"abstract":"<p>We report a search for the rare Dalitz decays <span>(omegatoeta e^{+}e^{-})</span> and <span>(rhotoeta e^{+}e^{-})</span> using data from the CMD-3 detector at the VEPP-2000 <span>(e^{+}e^{-})</span> collider. These decays probe the electromagnetic structure of vector mesons and test the Vector Dominance Model (VDM) in low-energy QCD. A blind analysis technique, combined with kinematic constraints and multivariate methods, suppresses dominant backgrounds from <span>(omegato 3pi)</span> and <span>(omegatoetagamma)</span> following with photon conversions. Preliminary results for the 2013 (12 pb<span>({}^{-1})</span>) and 2018 (21 pb<span>({}^{-1})</span>) datasets yield background estimates of <span>(N_{text{bg}}=0.7pm 0.4)</span> and <span>(1.9pm 0.6)</span> events, respectively. This study demonstrates sensitivity to branching ratios at the <span>(10^{-6})</span> level, establishing CMD-3 as a key instrument for precision tests of VDM predictions.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S386 - S393"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579599","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":"Obtaining of the Medical Radioisotopes Using the Linear Proton Accelerator of DARIA Project","authors":"V. E. Zamyshlyaeva,&nbsp;N. V. Markov,&nbsp;T. V. Kulevoy","doi":"10.1134/S1063778825100497","DOIUrl":"10.1134/S1063778825100497","url":null,"abstract":"<p>The possibility of expanding the application of DARIA compact neutron source installation based on a high-current linear proton accelerator to the field of radioisotope production for the needs of nuclear medicine is evaluated. The primary application area of this facility is a wide range of neutron research for fundamental and practical purposes. The calculation of the 18F isotope activities potentially generated at the accelerator of DARIA project was performed analytically and using software packages. The results of calculations and conclusions about the possibility of using the accelerator for medical radioisotopes production are presented.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 12","pages":"2491 - 2495"},"PeriodicalIF":0.4,"publicationDate":"2026-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147352720","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":"Enhancing the Yield of Molecular Hydrogen during the Process of γ-Radolysis of Water","authors":"A. P. Elokhin","doi":"10.1134/S1063778825120014","DOIUrl":"10.1134/S1063778825120014","url":null,"abstract":"<p>The paper considers the problem of increasing the yield of molecular hydrogen during the process of water radiolysis. In order to increase the yield, the authors suggest using an evenly distributed constant magnetic field, in addition to ionizing radiation. The analysis of radiolysis products was based on five chemical elements: radicals of hydrogen <span>({{{text{H}}}^{ bullet }})</span> and hydroxyl group <span>({text{O}}{{{text{H}}}^{ bullet }})</span> as well as molecular hydrogen Н₂, oxygen О₂ and hydrogen peroxyde Н₂О₂. The analysis of Н radicals “recombination”, when a hydrogen molecule formed, was performed within the framework of a hydrogen atom and molecule (Н₂) model of N. Bohr. A physical “mechanism” for increasing the yield of molecular hydrogen and a calculation algorithm under magnetic field conditions are presented. The results of the calculations demonstrated that as the magnetic field intensity increased, the concentration of active and molecular hydrogen increased as well, while the concentration of other radiolysis products declined. Thus, the use of the magnetic field and increased ionizing radiation dose rate will contribute to further increase of energy efficiency of γ-radiolysis of water for further hydrogen production. The negative aspect of extracting such environmentally-friendly fuel using such technologies is that the applied water cannot be simply discharged back after the cycle to the sea or river since it will contain <span>({text{OH}}bullet )</span> hydroxyl group which is a fairly “hard” radical capable of attaching to different molecular structures and forming chemical compounds with unknown properties; it will also contain H₂O₂ hydrogen peroxide which, when dissolved in water, is a danger to wildlife and humans, and therefore it cannot be simply discharged onto the ground for the same reason. In addition, as calculations and experimental results show, during the process of water radiolysis, the amount of oxygen dissolved in the water decreases, which leads to the formation of properties that will negatively affect the life of aquatic flora and fauna.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 12","pages":"2545 - 2553"},"PeriodicalIF":0.4,"publicationDate":"2026-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147352745","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":"Managing the Aging of Dynamically Loaded Pipelines","authors":"S. B. Kravets,&nbsp;M. M. Kostikova,&nbsp;S. A. Kuzin,&nbsp;A. Y. Smolin,&nbsp;A. E. Dembitsky","doi":"10.1134/S1063778825100175","DOIUrl":"10.1134/S1063778825100175","url":null,"abstract":"<p>In the Russian Federation, the requirements for managing the aging (service life) of pipelines classified in the designs of nuclear power plant (NPP) units as elements of safety classes 1, 2, and 3 according to the federal regulations and rules are established in NP-096-15. For the dynamically loaded pipelines of nuclear power plants, one of the most “dangerous” loading factors is just vibration loads, as corrosion/erosion wear values are small for the real structures of NPP pipelines owing to the application of corrosion-resistant steels at a limited velocity of fluid flows (according to NP-068-05, the water flow velocity up to 5 m/s, and the steam and gas flow velocity up to 60 m/s). Some problems of managing the aging of dynamically loaded pipelines are considered. A calculation-experimental method of estimating the stress-strain state of a pipeline under vibration is proposed to determine its damageability under cyclic loads. It is recommended to use the values of accumulated and ultimate damage as a pipeline service life characteristic under vibration loading instead of normalized frequencies or amplitudes of vibrations.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 12","pages":"2354 - 2357"},"PeriodicalIF":0.4,"publicationDate":"2026-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147352746","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}