Physics of Atomic Nuclei最新文献

{"title":"Minimal Analytical Model of Neutrino Distribution Function in Supernova","authors":"A. A. Dobrynina,&nbsp;E. A. Koptyaeva,&nbsp;I. S. Ognev","doi":"10.1134/S1063778825700164","DOIUrl":"10.1134/S1063778825700164","url":null,"abstract":"<p>The possibility of an analytical approximation of nonequilibrium neutrino distribution under core-collapse supernova conditions is considered. In minimal model, an analytical approximation depends on four parameters at each point of the supernova. Within this model, three approximations of the energy neutrino distribution and three variants of angular neutrino distribution are analyzed, and their accuracy is estimated. Based on this analysis, two variants of total four-parametric approximation for inner and outer part of supernova are constructed. In case of outer part of supernova, the approximation parameters are presented as function of the radial coordinate. The time dependence of the approximation parameters is determined from their correlation with the radius of the core of the protoneutron star and the spatial scale of neutrinosphere for electron neutrinos. This approach allows to apply obtained results for wide range of supernova models.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"171 - 177"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100220","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":"Galactic Center Shadows: Beyond the Standard Model","authors":"A. F. Zakharov","doi":"10.1134/S106377882570019X","DOIUrl":"10.1134/S106377882570019X","url":null,"abstract":"<p>In 2005 Zakharov et al. predicted an opportunity to reconstruct a shadow in Sgr A* with ground based or space—ground interferometer acting in mm or sub-mm band (the Millimetron was mentioned for such needs). The prediction was confirmed in May 2022 since the Event Horizon Telescope (EHT) Collaboration presented results of a shadow reconstruction for our Galactic Center (the shadow around the supermassive black hole in M87 was reconstructed in 2019). These reconstructions were based on EHT observations done in 2017. In 2005 Zakharov et al. also derived analytical expressions for shadow size as a function of charge for Reissner–Nordström metric and later these results were generalized for a tidal charge case. We discuss opportunities to evaluate parameters of alternative theories of gravity with shadow size estimates done by the EHT Collaboration, in particular, a tidal charge could be estimated from these observations. We also discuss opportunities to use Millimetron facilities for shadow reconstructions in M87* and Sgr A*. In our recent studies we discuss shadow formations for cases where naked singularities, wormholes or more exotic models substitute conventional black holes in galactic centers.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"154 - 170"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S106377882570019X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100197","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":"Study of the ({}^{{8}})Li Low-Lying Excited States","authors":"A. S. Demyanova,&nbsp;A. N. Danilov,&nbsp;S. A. Goncharov,&nbsp;N. T. Burtebayev,&nbsp;V. I. Starastsin,&nbsp;T. I. Leonova","doi":"10.1134/S1063778825700073","DOIUrl":"10.1134/S1063778825700073","url":null,"abstract":"<p>The root-mean-square radii of <span>({}^{8})</span>Li in the short-lived excited states were experimentally deduced from the analysis of <span>({}^{8}textrm{Li}+{}^{2})</span>H and <span>({}^{8}textrm{Li}+{}^{12})</span>C diffraction scattering. Differential cross sections of the elastic and inelastic scattering were analyzed by the Modified diffraction model (MDM). No significant radius enhancement was observed for the first excited state 0.98 MeV 1<span>({}^{+})</span>. At the same time 40<span>(%)</span> radius enhancement was estimated for the second excited state 2.26 MeV 3<span>({}^{+})</span>. This result is argument to possible halo structure of this state.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"6 - 10"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100217","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":"Analysis of the Search Results for Pentaquarks in the Zeus Experiment","authors":"R. K. Dementiev,&nbsp;I. A. Korzhavina","doi":"10.1134/S1063778825700024","DOIUrl":"10.1134/S1063778825700024","url":null,"abstract":"<p>The results of the search for the pentaquarks <span>(Theta^{+})</span> and <span>(bar{Theta}^{+})</span> in the ZEUS experiment are analyzed within the framework of the model of formation of five-quark states. The criteria for selecting pentaquarks, leading to different results of observing the resonant signal, are considered. Possible reasons for the negative results of the search for pentaquarks are identified.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"67 - 77"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100216","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 (Sigma) Baryons in p–Pb and pp Collisions at the LHC with ALICE","authors":"Pavel Gordeev,&nbsp;the ALICE Collaboration","doi":"10.1134/S1063778824700996","DOIUrl":"10.1134/S1063778824700996","url":null,"abstract":"<p>During the LHC Run 2 several methods to identify charged <span>(Sigma)</span> have been developed by ALICE. The main challenge of <span>(Sigma)</span> measurements is the reconstruction of (anti-)neutrons, neutral mesons and soft photons produced in the decays using the electromagnetic calorimeter and photon conversion method. A novel method to detect anti-neutrons in the Photon Spectrometer (PHOS) was proposed, allowing the <span>(bar{Sigma}^{pm}rightarrowbar{n}pi^{pm})</span> decays to be reconstructed. We present the transverse momentum spectra of <span>(bar{Sigma}^{pm})</span> in minimum bias <i>pp</i> and <i>p</i>–Pb collisions at <span>(sqrt{s}=5.02)</span> TeV compared with predictions from state-of-the-art Monte Carlo models. Also, results related to <span>(Sigma^{+}rightarrow ppi^{0})</span> and <span>(Sigma^{0}rightarrowgammaLambda)</span> spectra and integrated yields measurements in Run 2 are presented.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3 supplement","pages":"S432 - S437"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570937","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":"Holographic Model for Color Superconductivity in ({d})-Dimension Bulk without Confinement Phase","authors":"Nguyen Hoang Vu","doi":"10.1134/S1063778824701060","DOIUrl":"10.1134/S1063778824701060","url":null,"abstract":"<p>We generalize the concept of holography for the color superconductivity (CSC) phase by considering <span>(d)</span>-dimensional Anti de Sitter (AdS) space instead of the traditional 6 dimensions. The corresponding dual field theory is a gauge theory with <span>(SU)</span>(<span>(N_{c})</span>) symmetry defined in (<span>(d-1)</span>)-dimensions that, despite lacking a confinement phase, retains characteristics consistent with quantum chromodynamics (QCD) CSC. We then use a holographic model based on Einstein–Maxwell gravity and the standard Maxwell interaction in <span>(d)</span>-dimensional AdS space to investigate this phenomenon for the number of colors <span>(N_{c}geq 2)</span> without confinement phase, identifying the dimensions where the model remains valid for <span>(N_{c}=2)</span>.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3 supplement","pages":"S483 - S488"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570936","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":"Study of the ({}^{{6}})Li ({0}^{{+}}) Excited State","authors":"S. S. Stukalov,&nbsp;Yu. G. Sobolev,&nbsp;Yu. E. Penionzhkevich,&nbsp;N. Burtebayev,&nbsp;S. A. Goncharov,&nbsp;Yu. B. Gurov,&nbsp;A. N. Danilov,&nbsp;A. S. Demyanova,&nbsp;S. V. Dmitriev,&nbsp;M. Nassurlla,&nbsp;V. I. Starastsin,&nbsp;A. V. Shakhov,&nbsp;S. K. Raidun","doi":"10.1134/S1063778824701011","DOIUrl":"10.1134/S1063778824701011","url":null,"abstract":"<p>\u0000 <span>({}^{7})</span>Li elastic scattering and the lithium-induced reaction of one-nucleon transfers from <span>({}^{10})</span>B(<span>({}^{7})</span>Li, <span>({}^{6})</span>Li)<span>({}^{11})</span>B have been measured at <span>(E_{textrm{LAB}})</span>(<span>({}^{7})</span>Li) = 58 MeV using U-400 accelerator beam of the FLNR JINR, Dubna. Angular distribution for reaction <span>({}^{10})</span>B(<span>({}^{7})</span>Li, <span>({}^{6})</span>Li)<span>({}^{11})</span>B with excitation of the 3.56 MeV state (<span>({}^{6}textrm{Li}^{*})</span>) is presented for the first time. The ‘‘Finite Range Distorted Wave Born Approximation’’ (FRDWBA) analysis of the differential cross section of the <span>({}^{10})</span>B(<span>({}^{7})</span>Li, <span>({}^{6})</span>Li)<span>({}^{11})</span>B ground state (g.s.) transition and excited (<span>(J^{pi}=0^{+})</span>, <span>(T=1)</span>, <span>(E=3.56)</span> MeV) state of <span>({}^{6})</span>Li transition was performed. Phenomenological approach based on solving an approximate equation for the reaction form factor was used to determine its radial dependence and empirical values of asymptotic normalization coefficient (ANC). The obtained values of ANC for the <span>({}^{6})</span>Li<span>({}_{textrm{g.s}})</span> and <span>({}^{6}textrm{Li}^{*})</span>(3.56 MeV) states are in agreement with the literature ones. Comparison of the radial dependences of form factors shows that the wave function of the <span>({}^{6})</span>Li nucleus in excited (<span>(J^{pi}=0^{+})</span>, <span>(T=1)</span>, <span>(E=3.56)</span> MeV) state has increased spatial dimension compared to the ground state. This result is an argument in favor of a halo existence in <span>({}^{6}textrm{Li}^{*})</span>(3.56 MeV) state, while the question of a halo in <span>({}^{6})</span>Li<span>({}_{textrm{g.s.}})</span> still stays open.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3 supplement","pages":"S426 - S431"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571083","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":"Experimental Study of Interaction of the Proton and Deuteron with the Atomic Nuclei of Lithium and Boron","authors":"G. M. Ostreinov,&nbsp;S. Yu. Taskaev,&nbsp;Ia. M. Kolesnikov,&nbsp;E. O. Sokolova,&nbsp;T. A. Bykov,&nbsp;D. A. Kasatov,&nbsp;M. I. Bikchurina,&nbsp;S. S. Savinov","doi":"10.1134/S1063778824701059","DOIUrl":"10.1134/S1063778824701059","url":null,"abstract":"<p>At the electrostatic accelerator at the Institute of Nuclear Physics, the differential cross-sections of nuclear reactions with deuteron and proton beams on light nuclei in the energy range of 0.3–2.2 MeV were measured by <span>(alpha)</span>-detector.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3 supplement","pages":"S409 - S417"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570995","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":"Recent Progress in Asymptotic Safety","authors":"Alfiia Mukhaeva","doi":"10.1134/S106377882470100X","DOIUrl":"10.1134/S106377882470100X","url":null,"abstract":"<p>Free and interacting fixed points of the renormalization group play an important role in particle and statistical physics. High energy fixed points such as in asymptotic freedom or asymptotic safety are crucial for a fundamental definition of quantum field theory. Low energy fixed points relate to (quantum) phase transitions and critical phenomena. In this contribution, we explain the arising of weakly interacting fixed points in general 4d QFTs. This covers necessary and sufficient conditions for existence, and explicit examples. In addition, we also review the last progress in calculation of beta functions, anomalous dimensions up to four loop in the gauge and three loop in the Yukawa and scalar couplings. Moreover, we will overview the status of functional renormalization group and its implications for gravity.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3 supplement","pages":"S489 - S494"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571078","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":"DosePreview Software for Rapid Planning of Radiation Processing of Biological Objects and Materials","authors":"S. A. Zolotov,&nbsp;U. A. Bliznyuk,&nbsp;N. A. Antipina,&nbsp;A. D. Nikitchenko,&nbsp;A. A. Nikolaeva,&nbsp;F. R. Studenikin,&nbsp;A. P. Chernyaev","doi":"10.1134/S1063778824701047","DOIUrl":"10.1134/S1063778824701047","url":null,"abstract":"<p>To optimize the radiation processing planning process, the software ‘‘DosePreview by IRT’’ has been developed, which calculates depth dose distributions based on the specified energy spectrum of the electron beam. This software is built on a database of depth dose distributions from monoenergetic electrons, covering energy levels from 0.1 to 20 MeV and calculated using the Geant4 simulation toolkit. The created tool can make the planning of radiation processing easier and faster. This will help to make the use of electron beam technology for food processing more accessible and contribute to food security.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 3 supplement","pages":"S452 - S460"},"PeriodicalIF":0.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570935","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}