Physics of Atomic Nuclei最新文献

{"title":"Model Uncertainty in Measuring the Gluon Jet Fraction at the Hadron Collider","authors":"S.G. Shulha","doi":"10.1134/S1063778824700443","DOIUrl":"10.1134/S1063778824700443","url":null,"abstract":"<p>The work proposes a new method for measuring the gluon jet fraction in jet sample produced at the hadron collider. This method uses model quark/gluon templates—distributions of quark and gluon jets over the jet macro parameter. Within the framework of this method, it is possible to find a model uncertainty of measurement associated with the deviation of model quark/gluon templates from the true ones. The issue of data-motivated corrections to the model quark/gluon templates is discussed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 4","pages":"509 - 512"},"PeriodicalIF":0.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198583","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":"Dynamics of Energy Release in a Nuclear-Reactor Core","authors":"V. I. Kopeikin,&nbsp;D. V. Popov,&nbsp;M. D. Skorokhvatov","doi":"10.1134/S106377882470039X","DOIUrl":"10.1134/S106377882470039X","url":null,"abstract":"<p>The development of reactor technologies and neutrino physics by means of nuclear reactors requires unceasingly refining and extending knowledge of reactors as an antineutrino source. By employing new data on the reactor-antineutrino spectrum and updated nuclear databases and upon taking into account special features of fuel burnup, the thermal energy released in the reactor core per fission event is calculated for a standard operating period of a thermal-neutron reactor.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 4","pages":"389 - 398"},"PeriodicalIF":0.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198568","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 New Symmetries of Hadron Production in High Energy Collisions of Protons and Nuclei","authors":"Mikhail Tokarev,&nbsp;Imrich Zborovský","doi":"10.1134/S1063778824700431","DOIUrl":"10.1134/S1063778824700431","url":null,"abstract":"<p>The status of <span>(z)</span>-scaling theory is briefly reviewed. Basic physical principles of self-similarity, locality, and fractality are discussed. The microscopic scenario of interactions of hadrons and nuclei at a constituent level in terms of dimensionless variables is studied. Applicability of the <span>(z)</span>-scaling approach for the description of polarization processes is justified. A conservation law for new quantity—fractal cumulativity—is formulated. The statistical properties and crossing symmetry of fractal dimensions are investigated.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 4","pages":"513 - 517"},"PeriodicalIF":0.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198581","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":"On Bjorken Sum Rule with Analytic Coupling at Low ({Q}^{{2}}) Values","authors":"I. R. Gabdrakhmanov,&nbsp;N. A. Gramotkov,&nbsp;A. V. Kotikov,&nbsp;D. A. Volkova,&nbsp;I. A. Zemlyakov","doi":"10.1134/S1063778824700388","DOIUrl":"10.1134/S1063778824700388","url":null,"abstract":"<p>Below, we present a brief review of the recent studies of the polarized Bjorken sum rule <span>(Gamma_{1}^{p-n}left(Q^{2}right))</span> for small values of <span>(Q^{2})</span>. Our careful analysis reveals an excellent agreement between the experimental data and the predictions recently obtained in the framework of analytic QCD. Well-known perturbative expressions for coupling constant on the contrary lead to a strong difference between these data and turn out to be inapplicable. To estimate calculated phenomenological values, we discussed the photoproduction limit.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 4","pages":"536 - 540"},"PeriodicalIF":0.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198585","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":"Positron Supercritical Resonances and Spontaneous Positron Creation in Slow Collisions of Heavy Nuclei","authors":"D. A. Telnov,&nbsp;N. K. Dulaev,&nbsp;Y. S. Kozhedub,&nbsp;I. A. Maltsev,&nbsp;R. V. Popov,&nbsp;I. I. Tupitsyn,&nbsp;V. M. Shabaev","doi":"10.1134/S1063778824700261","DOIUrl":"10.1134/S1063778824700261","url":null,"abstract":"<p>We present a theoretical and computational study of positron supercritical resonances in systems consisting of two highly-charged bare nuclei. The resonance positions and widths depending on the internuclear separation are calculated with the help of the complex-scaling generalized pseudospectral method in modified prolate spheroidal coordinates. The results are applied to estimate the probability of spontaneous positron creation in slow U<span>({}^{92+})</span>–U<span>({}^{92+})</span> and Cm<span>({}^{96+})</span>–Cm<span>({}^{96+})</span> collisions.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3","pages":"319 - 326"},"PeriodicalIF":0.3,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574207","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":"Determination of Asymptotic Normalization Coefficients by Analytic Continuation of the ({R})-Matrix","authors":"L. D. Blokhintsev,&nbsp;D. A. Savin","doi":"10.1134/S1063778824700042","DOIUrl":"10.1134/S1063778824700042","url":null,"abstract":"<p>The method of finding the values of asymptotic normalization coefficients (ANC) is proposed based on the analytic continuation of the <span>(R)</span>-matrix that describes the elastic nuclear scattering into the unphysical region of the negative energy of collision (<span>(E&lt;0)</span>). The formula is derived, expressing the partial-wave scattering amplitude through the <span>(R)</span>-matrix and modified Coulomb functions. This formula allows, when continuing the amplitude to the region <span>(E&lt;0)</span>, to overcome difficulties associated with irregular behavior of the scattering amplitude near <span>(E=0)</span> if the Coulomb interaction is present. The proposed method is used to determine the ANC for the channel <span>({}^{16}textrm{O}toalpha+{}^{12})</span>C.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3","pages":"352 - 358"},"PeriodicalIF":0.3,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1063778824700042.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Possibility of Detecting TeV Electrons and Positrons of Galactic Cosmic Rays Using the Earth’s Magnetic Field","authors":"A. P. Stuzhin,&nbsp;V. V. Mikhailov","doi":"10.1134/S106377882470011X","DOIUrl":"10.1134/S106377882470011X","url":null,"abstract":"<p>The research of the electron and positron spectrum of galactic cosmic rays is an important task of high-energy astrophysics. The necessity of using new methods of electron and positron registration is caused by insufficient statistical reliability of data from modern experiments in the TeV energy range. In the present work, one of the possible registration methods based on the use of synchrotron radiation of electrons and positrons in the Earth’s magnetic field is investigated. Using modeling of trajectories of high-energy electrons, positrons, and synchrotrons photons emitted by them, the detector count rate for the ISS and ROS orbits has been estimated. The possibility of separation of electrons and positrons using this method is shown.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3","pages":"160 - 164"},"PeriodicalIF":0.3,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574416","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":"Bose–Einstein Condensation and Muon Production in Ultrahigh Energy Cosmic Ray Particle Collisions","authors":"V. A. Okorokov","doi":"10.1134/S1063778824700108","DOIUrl":"10.1134/S1063778824700108","url":null,"abstract":"<p>Collisions of cosmic ray particles with ultrahigh initial energies with nuclei in the atmosphere open a wide room for appearing of the novel dynamical features for multiparticle production processes. In particular, the laser-like behavior of pions driven by Bose–Einstein condensation would result in the shift to larger multiplicities and, as a consequence, could provide, in general, the enhanced yield of cosmic muons. In the present work the critical value of the space charged particle density for onset of Bose–Einstein condensation of the boson (pion) wave packets into the same wave-packet state is estimated within the model with complete multiparticle symmetrization for the energy domain corresponding to the ultrahigh energy cosmic rays (UHECR). Energy dependence of mean density of charged pions is evaluated for the cases of absence of the Bose–Einstein effects and for presence of laser-like behavior of pions. The possible influence of the Bose–Einstein condensation is discussed for the muon production in UHECR particle collisions with the atmosphere.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3","pages":"172 - 183"},"PeriodicalIF":0.3,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574419","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":"Properties of Octupole States ({}^{{238}})U","authors":"P. N. Usmanov,&nbsp;A. I. Vdovin,&nbsp;A. N. Nishonov","doi":"10.1134/S1063778824700182","DOIUrl":"10.1134/S1063778824700182","url":null,"abstract":"<p>The energies and electrical properties of the octupole states of the <span>({}^{238})</span>U nucleus are studied within the framework of a phenomenological model considering the Coriolis mixing of rotational bands. Mixing of the low-lying negative parity bands is considered. The energies, the structures of states of rotational bands with <span>(K^{{pi}}=0^{-})</span>, <span>(1^{-})</span>, <span>(2^{-})</span>, <span>(3^{-})</span>, and the reduced probabilities of <i>E</i>1 transitions are calculated. Theoretical energy values and <span>(E)</span>1 transitions’ probabilities are compared with the experimental data. Good agreement between experimental data and theoretical results is obtained.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3","pages":"131 - 141"},"PeriodicalIF":0.3,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574412","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 High-Energy Gamma Quanta from the Cygnus Cocoon Source in October–November 2020","authors":"E. Okuneva,&nbsp;L. Sveshnikova,&nbsp;I. Astapov,&nbsp;P. Bezyazykov,&nbsp;A. Blinov,&nbsp;A. Borodin,&nbsp;E. Bonvech,&nbsp;N. Budnev,&nbsp;A. Bulan,&nbsp;P. Busygin,&nbsp;A. Vaidyanatan,&nbsp;N. Volkov,&nbsp;P. Volchugov,&nbsp;D. Voronin,&nbsp;A. Gafarov,&nbsp;E. Gres,&nbsp;O. Gres,&nbsp;T. Gres,&nbsp;O. Grishin,&nbsp;A. Garmash,&nbsp;V. Grebenyuk,&nbsp;A. Grinyuk,&nbsp;A. Dyachok,&nbsp;D. Zhurov,&nbsp;A. Zagorodnikov,&nbsp;A. Ivanova,&nbsp;A. Ivanova,&nbsp;M. Ilyushin,&nbsp;N. Kalmykov,&nbsp;V. Kindin,&nbsp;V. Kiryukhin,&nbsp;R. Kokoulin,&nbsp;N. Kolosov,&nbsp;K. Kompaniets,&nbsp;E. Korosteleva,&nbsp;V. Kozhin,&nbsp;E. Kravchenko,&nbsp;A. Kryukov,&nbsp;L. Kuzmichev,&nbsp;A. Chiavassa,&nbsp;M. Lavrova,&nbsp;A. Lagutin,&nbsp;Y. Lemeshev,&nbsp;B. Lubsandorzhiev,&nbsp;N. Lubsandorzhiev,&nbsp;S. Malakhov,&nbsp;R. Mirgazov,&nbsp;R. Monkhoev,&nbsp;E. Osipova,&nbsp;A. Pakhorukov,&nbsp;A. Pan,&nbsp;A. Panov,&nbsp;L. Pankov,&nbsp;A. Petrukhin,&nbsp;D. Podgrudkov,&nbsp;I. Poddubny,&nbsp;E. Popova,&nbsp;E. Postnikov,&nbsp;V. Prosin,&nbsp;V. Ptuskin,&nbsp;A. Pushnin,&nbsp;A. Razumov,&nbsp;R. Raikin,&nbsp;G. Rubtsov,&nbsp;E. Ryabov,&nbsp;V. Samoliga,&nbsp;I. Satyshev,&nbsp;A. Silaev,&nbsp;A. Silaev, Jr.,&nbsp;A. Sidorenkov,&nbsp;A. Skurikhin,&nbsp;A. Sokolov,&nbsp;V. Tabolenko,&nbsp;A. Tanaev,&nbsp;M. Ternovoy,&nbsp;L. Tkachev,&nbsp;N. Ushakov,&nbsp;D. Chernov,&nbsp;I. Yashin","doi":"10.1134/S1063778824700194","DOIUrl":"10.1134/S1063778824700194","url":null,"abstract":"<p>In November 2020, the IceCube Neutrino Observatory registered a neutrino event with an energy of 150 TeV directed at the Cygnus Cocoon gamma-ray source. In the Carpet-2 experiment, as part of the Baksan Neutrino Observatory (BNO), a sharp increase in the flow of events with an energy above 300 TeV was recorded from the same direction within the angular accuracy of the events. This flux is 4 orders of magnitude higher than the expected intensity of gamma quanta of this energy region according to data in the region of less than 100 TeV. It was expected that such a powerful flare could be registered by the TAIGA-HiSCORE installation of the TAIGA astrophysical complex. We analyzed the events of the EAS recorded by the installation of TAIGA-HiSCORE for 18 h in October–November 2020 from the Cygnus Cocoon source. This article provides the upper limit of the expected excess flow.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3","pages":"165 - 171"},"PeriodicalIF":0.3,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141574417","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}