Physics of Atomic Nuclei最新文献

{"title":"Quark Counting Rules for the Production of Cumulative Pions with Large Transverse Momenta","authors":"Semyon Yurchenko,&nbsp;Vladimir Vechernin","doi":"10.1134/S1063778825700462","DOIUrl":"10.1134/S1063778825700462","url":null,"abstract":"<p>Pion production in <i>AA</i> collisions in a new cumulative region of central rapidities and large transverse momenta accessible for experimental study at the SPD and MPD facilities of the NICA collider is considered. The asymptotic behavior of the inclusive cross section at high initial energies near the kinematic boundary is calculated and quark counting rules for this process are formulated. The obtained expressions give an explicit dependence of the inclusive cross section of cumulative pion production on the initial energy and cumulative number near the kinematic boundary of the <i>AA</i> collision.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"349 - 355"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164794","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":"Commissioning of 3D-Segmented Neutrino Detector SuperFGD in the T2K Neutrino Beam","authors":"A. Chvirova,&nbsp;A. Dergacheva,&nbsp;D. Fedorova,&nbsp;S. Fedotov,&nbsp;G. Erofeev,&nbsp;A. Izmaylov,&nbsp;M. Kolupanova,&nbsp;Y. Kudenko,&nbsp;A. Mefodev","doi":"10.1134/S1063778825700267","DOIUrl":"10.1134/S1063778825700267","url":null,"abstract":"<p>The Super Fine-Grained neutrino Detector (SuperFGD) is a novel fully active neutrino detector and a key element of the upgraded near off-axis detector ND280 of the T2K experiment. SuperFGD is made of approximately 2000000 optically-isolated plastic scintillator 1 cm<span>({}^{3})</span> cubes each one read out by three orthogonal wavelength shifting (WLS) fibers coupled to about 56000 silicon photomultipliers. The detector provides 4<span>(pi)</span> particle tracking with a proton detection threshold of about 300 MeV/<i>c</i>. A nanosecond single-channel time resolution allows to detect neutrons produced by neutrino interactions by time-of-flight. This paper presents the results of the calibration of SuperFGD readout channels using LED system and cosmic muons, as well as the detection of muon neutrinos through charged current interactions in the T2K neutrino beam. Special attention is paid to the reconstruction of muons and stopped protons in SuperFGD.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"260 - 268"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164836","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":"Neutron–Proton Scattering Length Data Extracted from the ({n+{}^{2}}mathbf{H}{to n+n+p}) Reaction at ({E_{n}=5}) MeV","authors":"A. A. Kasparov,&nbsp;M. V. Mordovskoy,&nbsp;A. A. Afonin,&nbsp;V. V. Mitsuk","doi":"10.1134/S106377882570022X","DOIUrl":"10.1134/S106377882570022X","url":null,"abstract":"<p>The <span>(nd)</span> breakup reaction at an energy of 5 MeV was studied on the RADEX neutron channel of the Institute for Nuclear Research of the Russian Academy of Sciences. As a result of comparing the experimental data with the simulation results, the energy of the virtual <span>({}^{1}S_{0})</span>\u0000 <span>(np)</span> state <span>(E_{np}=40pm 2)</span> keV and the corresponding singlet <span>(np)</span> scattering length <span>(a_{np}={-}30.9pm 0.8)</span> fm were extracted. It was assumed that the obtained <span>(a_{np})</span> value, together with the data of other experiments on the study of <span>(nd)</span> and <span>(dd)</span> breakup reactions at different energies, are subject to the influence of <span>(3N)</span> forces. The work was carried out as part of a series of studies on internucleon interactions at low energies.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"374 - 382"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164844","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 Reactions Induced by Fast Neutrons on ({}^{{10}})B Nucleus with Tritium Emission Using Coordinate Detector","authors":"S. I. Potashev,&nbsp;I. V. Meshkov,&nbsp;Yu. M. Burmistrov,&nbsp;A. I. Drachev,&nbsp;S. Kh. Karaevsky,&nbsp;A. A. Kasparov,&nbsp;E. A. Permyakov,&nbsp;V. N. Ponomarev","doi":"10.1134/S1063778825700401","DOIUrl":"10.1134/S1063778825700401","url":null,"abstract":"<p>The interaction of fast neutrons with the <span>({}^{10})</span>B nucleus at energies from 3 to 7 MeV is studied with the aim of isolating the reaction with the production of the <span>({}^{8}textrm{Be}^{*})</span> nucleus in an excited state. This reaction stands out from the three-body reaction with the emission of triton and two <span>(alpha)</span> particles. Simulation of ionization losses of secondary <span>({}^{3})</span>H and <span>({}^{4})</span>He nuclei in solid and gas layers of position-sensitive multiwire detectors with sensitive sizes of both <span>(100times 100)</span> and <span>(50times 50)</span> mm<span>({}^{2})</span> showed that events are localized in different areas in diagrams plotted from losses in two gas layers. Experimental result, with <span>(100times 100)</span> mm<span>({}^{2})</span> detector showed the possibility of isolating a reaction with the emission of <span>({}^{3})</span>H and <span>({}^{8}textrm{Be}^{*})</span> nuclei.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"383 - 388"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164851","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":"Small-({p}_{{T}}) Production of (eta_{{c}}) Mesons within the Soft Gluon Resummation Approach","authors":"V. A. Saleev,&nbsp;K. K. Shilyaev","doi":"10.1134/S1063778825700309","DOIUrl":"10.1134/S1063778825700309","url":null,"abstract":"<p>In this article we describe the <span>(eta_{c})</span> production in proton–proton collisions at small values of the transverse momentum of the charmonium. Soft gluon resummation is used as a TMD factorization approach. At small transverse momenta, the color singlet contribution dominates, allowing us to use <span>(eta_{c})</span> as a test of the resummation scheme for the noncollinear gluon PDF. The cross sections of <span>(eta_{c})</span> production at <span>(sqrt{s}=27)</span> GeV, <span>(115)</span> GeV and <span>(13)</span> TeV are predicted.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"338 - 341"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163960","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":"A Comprehensive Analysis of Alpha–Nucleon Phase Shifts Using Modified Hylleraas Potential","authors":"Debashish Saha,&nbsp;Smruti Ranjan Mishra,&nbsp;Amit Bikram Mohapatra,&nbsp;Jhasaketan Bhoi","doi":"10.1134/S1063778825700425","DOIUrl":"10.1134/S1063778825700425","url":null,"abstract":"<p>The burgeoning interest in theoretical physics, particularly within the microscopic domain and in the context of many-body systems, necessitates the employment of the <span>({}^{4})</span>He nucleus as an exemplar for the investigation of nuclear forces via an array of theoretical modelling methodologies. Rigorous importance of the study of alpha–nucleon system developed the curiosity among the physicists to deal with the problem by the formalism of two body scattering theory. The alpha–neutron system was analyzed using a modified Hylleraas potential as the nuclear interaction component, while the alpha–proton system incorporated an additional pure Coulomb potential to model the electromagnetic interaction. It is argued that the traditional phase function method (PFM) does not hold good for pure Coulomb and Coulomb-like interaction and needs modification. For brevity, it is conjectured here that local Coulomb-like potential is equally applicable for the traditional phase function method which will be examine through some model calculations. The scattering phase shifts for <span>({}^{2}S_{1/2})</span>, <span>({}^{2}P_{1/2})</span>, <span>({}^{2}P_{3/2})</span>, <span>({}^{2}D_{3/2})</span> and <span>({}^{2}D_{5/2})</span> states of both the alpha–neutron and alpha–proton systems at a laboratory energy of 12.5 MeV were computed using the Phase Function Method. The calculated phase shifts were then compared to previously reported data, revealing a strong agreement that emphasizes the validity and effectiveness of the present methodological approach.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"220 - 231"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164843","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":"Status of the Scintillation Experiment of the TAIGA Astrophysical Complex","authors":"E. A. Kravchenko,&nbsp;I. I. Astapov,&nbsp;P. A. Bezyazeekov,&nbsp;E. A. Bonvech,&nbsp;A. Blinov,&nbsp;A. N. Borodin,&nbsp;N. M. Budnev,&nbsp;A. V. Bulan,&nbsp;P. V. Busygin,&nbsp;D. V. Chernov,&nbsp;A. Chiavassa,&nbsp;A. N. Dyachok,&nbsp;V. A. Erofeeva,&nbsp;A. R. Gafarov,&nbsp;A. Yu. Garmash,&nbsp;V. M. Grebenyuk,&nbsp;E. O. Gress,&nbsp;O. A. Gress,&nbsp;T. I. Gress,&nbsp;A. A. Grinyuk,&nbsp;O. G. Grishin,&nbsp;A. D. Ivanova,&nbsp;A. L. Ivanova,&nbsp;M. A. Iliushin,&nbsp;I. A. Kabannik,&nbsp;N. N. Kalmykov,&nbsp;V. V. Kindin,&nbsp;S. N. Kiryukhin,&nbsp;N. I. Kolosov,&nbsp;K. G. Kompaniets,&nbsp;E. E. Korosteleva,&nbsp;V. A. Kozhin,&nbsp;A. P. Kryukov,&nbsp;L. A. Kuzmichev,&nbsp;A. A. Lagutin,&nbsp;M. V. Lavrova,&nbsp;Yu. E. Lemeshev,&nbsp;B. K. Lubsandorzhiev,&nbsp;N. Lubsandorzhiev,&nbsp;A. Lukanov,&nbsp;S. D. Malakhov,&nbsp;R. R. Mirgazov,&nbsp;R. D. Monkhoev,&nbsp;E. A. Okuneva,&nbsp;E. A. Osipova,&nbsp;A. L. Pakhorukov,&nbsp;L. V. Pankov,&nbsp;A. Pan,&nbsp;A. D. Panov,&nbsp;A. A. Petrukhin,&nbsp;D. A. Podgrudkov,&nbsp;I. Poddubny,&nbsp;V. A. Poleschuk,&nbsp;E. G. Popova,&nbsp;E. B. Postnikov,&nbsp;V. V. Prosin,&nbsp;A. A. Pushnin,&nbsp;R. I. Raikin,&nbsp;A. V. Razumov,&nbsp;G. I. Rubtsov,&nbsp;E. V. Ryabov,&nbsp;V. S. Samoliga,&nbsp;I. Satyshev,&nbsp;A. A. Silaev,&nbsp; A. A. Silaev,&nbsp;A. Yu. Sidorenkov,&nbsp;A. V. Skurikhin,&nbsp;A. V. Sokolov,&nbsp;L. G. Sveshnikova,&nbsp;A. Shaikovsky,&nbsp;M. V. Shulga,&nbsp;V. A. Tabolenko,&nbsp;L. G. Tkachev,&nbsp;A. B. Tanaev,&nbsp;M. Yu. Ternovoy,&nbsp;N. A. Ushakov,&nbsp;P. A. Volchugov,&nbsp;N. V. Volkov,&nbsp;D. M. Voronin,&nbsp;V. Zirakashvili,&nbsp;A. V. Zagorodnikov,&nbsp;D. P. Zhurov,&nbsp;I. I. Yashin","doi":"10.1134/S1063778825600496","DOIUrl":"10.1134/S1063778825600496","url":null,"abstract":"<p>The scintillation experiment of the TAIGA astrophysical complex comprises two systems: Tunka-Grande and Taiga-Muon. The main objective of these systems is to study the energy spectrum and mass composition of cosmic rays in the energy range of <span>(10^{15}{-}10^{18})</span> eV, as well as to search for gamma radiation in the same energy range. An additional task of the experiments is to search for a signal from gamma quanta in the sub-PeV energy range in conjunction with wide angle Cherenkov detectors TAIGA-HiSCORE and Tunka-133. The report presents the objectives and status of the facility and a description of the design of scintillation counters and clusters. The results of the study of EAS with an unusual spatiotemporal structure are presented together with the results of a study of the joint operation of the Tunka-Grande and TAIGA-HiSCORE setups in order to search for sub-PeV gamma quanta. Estimates are made of the expected number of registered gamma quanta from the Crab Nebula.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"242 - 248"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163963","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":"Determining Low-Energy Characteristics of the (boldsymbol{pp}) Interaction in the ({d+{}^{1}}mathbf{H}{to p+p+n}) Reaction","authors":"A. A. Kasparov,&nbsp;M. V. Mordovskoy,&nbsp;V. V. Mitsuk,&nbsp;V. M. Lebedev,&nbsp;A. V. Spassky","doi":"10.1134/S1063778825700218","DOIUrl":"10.1134/S1063778825700218","url":null,"abstract":"<p>The study results of the <span>(d+{}^{1}textrm{H}to p+p+n)</span> reaction are presented. A kinematically complete experiment with using a deuteron beam energy of 15.3 MeV at the U-120 accelerator of the Skobeltsyn Institute of Nuclear Physics of the Lomonosov Moscow State University was carried out. A proton from the breakup of the singlet <span>(pp)</span> state and a secondary neutron were registered in coincidence. As a result of the study, the low-energy characteristics of <span>(pp)</span> interaction, namely, the energy value of the virtual singlet <span>(pp)</span> state and the corresponding value of the <span>(pp)</span> scattering length were determined.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"367 - 373"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164796","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 and Spin–Flavor Oscillations in Nondipolar Magnetic Fields of Astrophysical Objects","authors":"Anastasiia Mukhamedshina,&nbsp;Konstantin Stankevich,&nbsp;Alexander Studenikin,&nbsp;Degang Wang","doi":"10.1134/S1063778825700437","DOIUrl":"10.1134/S1063778825700437","url":null,"abstract":"<p>The neutrino evolution in realistic magnetic fields of astrophysical objects such as supernova bursts and neutron stars is studied. For the first time, we have derived an effective Hamiltonian for neutrinos propagating in nondipolar magnetic fields and obtained appropriate probabilities for neutrino oscillations.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"280 - 284"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164040","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":"Democratic Decay of a Three-Neutron System","authors":"M. K. Efimenko,&nbsp;I. A. Mazur,&nbsp;A. M. Shirokov,&nbsp;A. I. Mazur","doi":"10.1134/S1063778825700231","DOIUrl":"10.1134/S1063778825700231","url":null,"abstract":"<p>An application of the SS-HORSE–NCSM approach with realistic nucleon–nucleon forces to the search of resonant states in three-nucleon system is discussed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 2","pages":"362 - 366"},"PeriodicalIF":0.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160474","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}