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Physics of Atomic Nuclei最新文献

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Formation of the Multineutron Systems ({}^{{2}}{n}) and ({}^{{3}}{n}) in the Reactions of Stopped Pion Absorption 停止介子吸收反应中多中子体系({}^{{2}}{n})和({}^{{3}}{n})的形成
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825600046
Yu. B. Gurov, B. A. Chernyshev, S. A. Evseev, S. V. Rozov, V. G. Sandukovsky, M. V. Tel’kushev
{"title":"Formation of the Multineutron Systems ({}^{{2}}{n}) and ({}^{{3}}{n}) in the Reactions of Stopped Pion Absorption","authors":"Yu. B. Gurov,&nbsp;B. A. Chernyshev,&nbsp;S. A. Evseev,&nbsp;S. V. Rozov,&nbsp;V. G. Sandukovsky,&nbsp;M. V. Tel’kushev","doi":"10.1134/S1063778825600046","DOIUrl":"10.1134/S1063778825600046","url":null,"abstract":"<p>The formation of the multineutron systems <span>({}^{2}n)</span> and <span>({}^{3}n)</span> was studied in the reactions of stopped pion absorption by <span>({}^{9})</span>Be nuclei. Measurements were carried out at low energy pion channel of LANL using two-arm multilayer semiconductor spectrometer. The bound states of <span>({}^{2}n)</span> and <span>({}^{3}n)</span> have not been found. In the missing mass spectrum of the reaction <span>({}^{9})</span>Be(<span>(pi^{-})</span>, <span>(t^{4})</span>He), a peak was observed near the threshold, which is due to the formation of the <span>(s)</span>-wave virtual state of the dineutron. Indications of the existence of two states of the <span>({}^{3}n)</span> with resonant energies (<span>(E_{r}approx 6)</span> MeV, and <span>({approx}14)</span> MeV) were first obtained in the reactions <span>({}^{9})</span>Be(<span>(pi^{-})</span>, <span>(d^{4})</span>He) and <span>({}^{9})</span>Be(<span>(pi^{-})</span>, <span>(t^{3})</span>He). Comparison with theoretical and experimental results obtained by other authors was performed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"86 - 89"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100192","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}
引用次数: 0
Influence of Inverse Gluon Emission on Forward–Backward Asymmetry in Dilepton Production Process at LHC 对撞机双轻子产生过程中逆胶子发射对前后不对称性的影响
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700036
V. A. Zykunov
{"title":"Influence of Inverse Gluon Emission on Forward–Backward Asymmetry in Dilepton Production Process at LHC","authors":"V. A. Zykunov","doi":"10.1134/S1063778825700036","DOIUrl":"10.1134/S1063778825700036","url":null,"abstract":"<p>Inverse gluon emission in the dilepton production process in hadron collisions for Large Hadron Collider (LHC) experimental program is estimated in details. Numerical analysis of inverse emission effects on observable quantities (cross sections and, in more details, forward-backward asymmetry) is performed in a wide kinematic region including the CMS LHC experiment in Run3/HL regime which corresponds to ultrahigh energies and dilepton invariant masses. Effective techniques for analyzing the influence of different radiative contributions on forward–backward asymmetry using two additive relative corrections is suggested.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"112 - 123"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100193","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}
引用次数: 0
Triply Heavy Tetraquark Spectroscopy 三重四夸克光谱
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700061
V. O. Galkin, E. M. Savchenko
{"title":"Triply Heavy Tetraquark Spectroscopy","authors":"V. O. Galkin,&nbsp;E. M. Savchenko","doi":"10.1134/S1063778825700061","DOIUrl":"10.1134/S1063778825700061","url":null,"abstract":"<p>Masses of the ground and orbitally excited states of triply heavy tetraquarks with one open heavy flavor are calculated within the relativistic quark model, based on the quasipotential approach and QCD. Tetraquark is treated as a bound state of the nonobservable nonpointlike diquark and antidiquark. The relativistic quasipotential equation takes into account all relativistic corrections (both spin-dependent and spin-independent) and the internal structure of the diquarks via the insertion of calculated diquark–gluon form factors. The obtained masses of tetraquarks are compared with the strong fall-apart decay thresholds into a pair of heavy and heavy-light mesons. The states that lie slightly above or under such thresholds and thus could be observed as narrow resonances in other decay modes are identified.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"124 - 129"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100195","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}
引用次数: 0
Nucleosynthesis of Transuranium Elements in Thermonuclear Explosions 热核爆炸中超铀元素的核合成
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S106377882570005X
Yu. S. Lutostansky, V. I. Lyashuk
{"title":"Nucleosynthesis of Transuranium Elements in Thermonuclear Explosions","authors":"Yu. S. Lutostansky,&nbsp;V. I. Lyashuk","doi":"10.1134/S106377882570005X","DOIUrl":"10.1134/S106377882570005X","url":null,"abstract":"<p>Artificial rapid nucleosynthesis (r-process) in highly intensive neutron fluxes of thermonuclear explosions (<span>({sim}10{}^{24})</span> n/cm<span>({}^{2})</span> during the time <span>({sim}10^{-6})</span> s) is investigated within the developed dynamic model. Creation of transuranium nuclides is studied taking into account the time dependence of parameters and processes accompanying the beta decays of neutron-rich nuclei. The probabilities of beta-delayed processes are calculated based on the finite Fermi systems theory. Calculations of the transuranium nuclides’ yields <span>(Y(A))</span> are carried out for five large-scale explosive experiments in the United States (Mike, Anacostia, Par, Barbel, and Vulcan). Good or satisfactory agreement with experimental data is obtained. Even–odd anomaly in the observed transuranium yields at <span>(A&gt;250)</span> is explained by the effect of processes accompanying the beta decays of heavy neutron-rich isotopes.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"16 - 25"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S106377882570005X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100212","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}
引用次数: 0
The Unusual Events in X-Ray Emulsion Chamber Experiments x射线乳化室实验中的异常现象
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700048
S. E. Pyatovsky, E. A. Kanevskaya
{"title":"The Unusual Events in X-Ray Emulsion Chamber Experiments","authors":"S. E. Pyatovsky,&nbsp;E. A. Kanevskaya","doi":"10.1134/S1063778825700048","DOIUrl":"10.1134/S1063778825700048","url":null,"abstract":"<p>The article considers events in an experiment with X-ray emulsion chambers (XREC) to study the cores of extensive air showers (EASs) with energies of nuclei of primary cosmic radiation (PCR) <span>(E_{0}&gt;100)</span> TeV, which currently have no explanation within the Standard Model of nuclear interactions (SM). The XREC method is the only one that allows studying EAS cores with a high coordinate resolution of about 100 <span>(mu)</span>m. EAS cores contain the most complete information about primary acts of nuclear interactions, as a result of which all unusual events recorded by the XREC method are of great scientific interest. Several types of unusual events recorded by the XREC method are explained within the SM.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"39 - 46"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100214","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}
引用次数: 0
Optical Scheme of the Neutrino Channel with Magnetic Horns and Dipoles at the U-70 Accelerator Complex U-70加速器中磁角和偶极子中微子通道的光学方案
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700103
F. N. Novoskoltsev, R. Yu. Sinyukov, A. A. Sokolov
{"title":"Optical Scheme of the Neutrino Channel with Magnetic Horns and Dipoles at the U-70 Accelerator Complex","authors":"F. N. Novoskoltsev,&nbsp;R. Yu. Sinyukov,&nbsp;A. A. Sokolov","doi":"10.1134/S1063778825700103","DOIUrl":"10.1134/S1063778825700103","url":null,"abstract":"<p>The optical scheme of the channel based on two magnetic horns for the formation of neutrino beams with a narrow energy spectrum at the U-70 accelerator complex for the P2O experiment is considered. The far detector of the experiment is located at a distance of 2595 km from the end of the decay channel. To select the required momentum interval of <span>(pi)</span> mesons, it is proposed to use two dipole magnets with opposite polarity. The decay part of the channel is rotated relative to the direction of the primary proton beam to the target. The main calculated characteristics of neutrino beams at the far detector of the P2O experiment at an energy of the primary proton beam of 60 GeV are discussed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"105 - 111"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100194","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}
引用次数: 0
On the Clustering Method of Large Muon Events on the LVD Detector LVD探测器上大介子事件的聚类方法研究
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700140
Mark Simanovskiy, Natalia Agafonova
{"title":"On the Clustering Method of Large Muon Events on the LVD Detector","authors":"Mark Simanovskiy,&nbsp;Natalia Agafonova","doi":"10.1134/S1063778825700140","DOIUrl":"10.1134/S1063778825700140","url":null,"abstract":"<p>Hypotheses of detection and clustering of events at the LVD detector based on partially ordered time series of readings of scintillation counters are considered. Based on the ensemble technique, a method for separating events has been developed. A comparison of event fullness with respect to the fixed window method is discussed. The results can be useful in statistical analysis of the detector counters, automation of the search for neutrino bursts and high multiplicity muons.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"47 - 51"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100211","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}
引用次数: 0
T- and P-Symmetry of Total Cross Section of Polarized Deuteron–Deuteron Scattering 偏振氘核-氘核散射总截面的T对称性和p对称性
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700139
Yu. N. Uzikov
{"title":"T- and P-Symmetry of Total Cross Section of Polarized Deuteron–Deuteron Scattering","authors":"Yu. N. Uzikov","doi":"10.1134/S1063778825700139","DOIUrl":"10.1134/S1063778825700139","url":null,"abstract":"<p>Total cross section of the double polarized deuteron–deuteron scattering is considered assuming possible effects of time-reversal (<span>(T)</span>) and space reflection (<span>(P)</span>) invariance violation. A special attention is payed to the signal of <span>(T)</span>-invariance violating but parity conserving (TVPC) effect and a possibility of its extraction from the transmission of vector-polarized deuteron beam through a tensor-polarized deuteron target.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"150 - 153"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100221","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}
引用次数: 0
The Revision of Cumulative Spectra of Beta Particles from ({}^{235})U, ({}^{239})Pu, and ({}^{238})U Fission Products Based on the Updated Measurements of the Ratio of Spectra ({}^{235}text{U}/{}^{239})Pu 基于({}^{235}text{U}/{}^{239}) Pu谱比更新测量对({}^{235}) U、({}^{239}) Pu和({}^{238}) U裂变产物β粒子累积谱的修正
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700085
V. I. Kopeikin, D. V. Popov
{"title":"The Revision of Cumulative Spectra of Beta Particles from ({}^{235})U, ({}^{239})Pu, and ({}^{238})U Fission Products Based on the Updated Measurements of the Ratio of Spectra ({}^{235}text{U}/{}^{239})Pu","authors":"V. I. Kopeikin,&nbsp;D. V. Popov","doi":"10.1134/S1063778825700085","DOIUrl":"10.1134/S1063778825700085","url":null,"abstract":"<p>Based on new measurements of the ratio of cumulative spectra of <span>(beta)</span> particles fission products <span>({}^{235}text{U}/{}^{239})</span>Pu performed at the National Research Centre Kurchatov Institute (KI), the cumulative spectra of <span>(beta)</span> particles fission products of <span>({}^{235})</span>U, <span>({}^{239})</span>Pu, and <span>({}^{238})</span>U isotopes are updated. The presented spectra of <span>(beta)</span>-particles <span>({}^{235})</span>U and <span>({}^{239})</span>Pu of KI are compared with similar spectra measured at the Institute Laue–Langevin (ILL), and the spectrum of <span>(beta)</span> particles fission products <span>({}^{238})</span>U of KI are compared with the measurements performed at the Technical University of Munich (TUM). It is shown that the ILL ratio of spectra of <span>(beta)</span>-particles <span>({}^{235})</span>U/<span>({}^{239})</span>Pu is mistakenly overestimated by <span>({approx}5.4%)</span>.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"1 - 5"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100155","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}
引用次数: 0
Simulation of the MPD/ECal Setup for Cosmic Ray Calibration 宇宙射线校准MPD/ECal装置的仿真
IF 0.3 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-05-21 DOI: 10.1134/S1063778825700115
M. A. Martemianov, P. A. Bakhtin, V. M. Baryshnikov, S. A. Bulychjov, V. V. Kulikov, A. A. Kulikovskaya, M. A. Matsyuk, I. A. Tyapkin, G. E. Fomenko
{"title":"Simulation of the MPD/ECal Setup for Cosmic Ray Calibration","authors":"M. A. Martemianov,&nbsp;P. A. Bakhtin,&nbsp;V. M. Baryshnikov,&nbsp;S. A. Bulychjov,&nbsp;V. V. Kulikov,&nbsp;A. A. Kulikovskaya,&nbsp;M. A. Matsyuk,&nbsp;I. A. Tyapkin,&nbsp;G. E. Fomenko","doi":"10.1134/S1063778825700115","DOIUrl":"10.1134/S1063778825700115","url":null,"abstract":"<p>The cylindrical electromagnetic calorimeter of the MPD experiment being built within the framework of the NICA project, is assembled from 50 half-sectors, each contains 768 ‘‘shashlyk’’-type towers of different sizes and various spatial orientations. Methods for calibrating individual half-sectors with cosmic-ray muons under test-bench conditions are currently being developed. This article discusses the applicability of these methods to a fully assembled calorimeter ready for experiments on a heavy ion collider.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 1","pages":"96 - 100"},"PeriodicalIF":0.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100158","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}
引用次数: 0
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