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Angular Distribution of Photons in Light-Particle-Induced Reactions on the ({}^{{12}})C Nucleus from Analysis of Particle–({gamma}) Correlations 光粒子诱导反应中光子在({}^{{12}}) C核上的角分布——来自粒子- ({gamma})相关性的分析
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600563
L. I. Galanina, N. S. Zelenskaya, V. M. Lebedev, N. V. Orlova, A. V. Spassky
{"title":"Angular Distribution of Photons in Light-Particle-Induced Reactions on the ({}^{{12}})C Nucleus from Analysis of Particle–({gamma}) Correlations","authors":"L. I. Galanina,&nbsp;N. S. Zelenskaya,&nbsp;V. M. Lebedev,&nbsp;N. V. Orlova,&nbsp;A. V. Spassky","doi":"10.1134/S1063778825600563","DOIUrl":"10.1134/S1063778825600563","url":null,"abstract":"<p>The angular-correlation function for a final particle <span>(y)</span> and a photon is used to analyze gamma radiation that deexcites the nucleus produced in a nuclear reaction. The experimentally measured and calculated angular distributions of gamma radiation accompanying the deexcitation of <span>({}^{12})</span>C(<span>(2^{+})</span>) nuclei in reactions of inelastic deuteron and neutron scattering are compared. In the inelastic scattering of 15.3-MeV deuterons, this analysis was performed with the aid of the experimental and calculated values that we determined earlier for the spin-tensor components <span>(A_{k0}(theta_{d}))</span> of the <span>({}^{12})</span>C(<span>(2^{+})</span>) density matrix. In the inelastic scattering of 14.1-MeV neutrons, the experimental angular distribution of photons that was obtained by the TANGRA Collaboration is contrasted against its counterpart calculated on the basis of the spin-tensor components <span>(A_{k0}(theta_{n}))</span> determined by means of the coupled-channel method. The normalized angular distributions of photons agree with the experimental ones both in deuteron and in neutron scattering. It is shown that the anisotropy of gamma radiation in inelastic neutron scattering is greater by a factor of about 1.5 than that in inelastic deuteron scattering.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"398 - 405"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248237","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 DANSS Collaboration: Resent Results and Perspectives DANSS合作：最近的结果和观点
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600605
I. Alekseev, DANSS Collaboration
{"title":"The DANSS Collaboration: Resent Results and Perspectives","authors":"I. Alekseev,&nbsp;DANSS Collaboration","doi":"10.1134/S1063778825600605","DOIUrl":"10.1134/S1063778825600605","url":null,"abstract":"<p>The DANSS experiment at Kalininskaya NPP is running for already 8 years since April 2016. The largest in the world in the single experiment statistics of 8.5 million inverse beta-decay events is already collected. The data sample covers 4 full cycles of the industrial power reactor. DANSS experimental program includes both a search for physics beyond the Standard Model, like sterile neutrinos or large extra dimensions, and applied studies connected to reactor monitoring using electron antineutrino flux. The model independent exclusion area in the sterile neutrino parameter space for <span>(3+1)</span> hypothesis extends till <span>(sin^{2}2theta=0.004)</span> for <span>(Delta m^{2}=0.9)</span> eV<span>({}^{2})</span>, where sensitivity of the experiment is the best. Our data show presence of antineutrinos with energies above 10 MeV in the reactor spectrum with significance of 6.8<span>(sigma)</span>. Along with ongoing statistics collection DANSS is preparing for an upgrade, which shall significantly improve its energy resolution and also increase the fiducial volume. The article covers recent analysis results and the upgrade status.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"406 - 412"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248248","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
Parameterization of SiPM Signals of MPD/ECal for TOF Measurements 用于TOF测量的MPD/ECal SiPM信号的参数化
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825700504
P. A. Bakhtin, V. M. Baryshnikov, S. A. Bulychjov, G. E. Fomenko, V. V. Kulikov, A. A. Kulikovskaya, M. A. Martemianov, M. A. Matsyuk, I. A. Tyapkin
{"title":"Parameterization of SiPM Signals of MPD/ECal for TOF Measurements","authors":"P. A. Bakhtin,&nbsp;V. M. Baryshnikov,&nbsp;S. A. Bulychjov,&nbsp;G. E. Fomenko,&nbsp;V. V. Kulikov,&nbsp;A. A. Kulikovskaya,&nbsp;M. A. Martemianov,&nbsp;M. A. Matsyuk,&nbsp;I. A. Tyapkin","doi":"10.1134/S1063778825700504","DOIUrl":"10.1134/S1063778825700504","url":null,"abstract":"<p>Parameterizations of signals from the towers of the electromagnetic calorimeter of the MPD/NICA detector, aimed at an estimation of the time resolution of the calorimeter, are considered. Optimal parameters of the timing are determined within the constant fraction method. In test measurements with cosmic rays, a time resolution of 1.3–0.8 ns was obtained depending on the signal amplitude. These results show the possibility of relative calibration of the time parameters of calorimeter towers using cosmic rays.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"478 - 481"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248301","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
Searches for Large Extra Dimensions in the DANSS Experiment 在DANSS实验中寻找大额外维度
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600824
P. Gorovtsov, N. Skrobova, DANSS Collaboration
{"title":"Searches for Large Extra Dimensions in the DANSS Experiment","authors":"P. Gorovtsov,&nbsp;N. Skrobova,&nbsp;DANSS Collaboration","doi":"10.1134/S1063778825600824","DOIUrl":"10.1134/S1063778825600824","url":null,"abstract":"<p>The DANSS detector is placed under the reactor core of Kalinin NPP (at distances 10.9–12.9 m) and collects up to 5000 antineutrino events daily. One of the main goals of the experiment is to scrutinize the sterile neutrino hypothesis. A large fraction of allowed parameter space was excluded by DANSS: for some values of <span>(Delta m^{2})</span>, the exclusion goes down to <span>(sin^{2}(2theta)&lt;0.01)</span>, which had become the best in the world. In addition, the combination of a favorable detector placement near the reactor and large acquired statistics allows us to investigate other scenarios of electron antineutrino disappearance. This paper reports preliminary results on probing the Large Extra Dimensions (LED) hypothesis in the simplest approach of only one additional dimension. This theory describes particle oscillations to hidden, finite-size dimensions and provides sensitivity to neutrino masses. The report covers MC generation for different LED parameters, the study of the experiment sensitivity for oscillation to LED, and the investigation of exclusion areas in the parameter space in the coordinates of <span>(a)</span> and <span>(m_{0})</span>—the size of a hidden large extra dimension and a mass of the lightest neutrino.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"413 - 417"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248249","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
Atmospheric Neutrino Detection Efficiency Estimation in the NOvA Experiment NOvA实验中大气中微子探测效率的估计
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600897
A. Ivanova, A. Sheshukov
{"title":"Atmospheric Neutrino Detection Efficiency Estimation in the NOvA Experiment","authors":"A. Ivanova,&nbsp;A. Sheshukov","doi":"10.1134/S1063778825600897","DOIUrl":"10.1134/S1063778825600897","url":null,"abstract":"<p>The NOvA experiment is designed to study oscillations in an accelerator neutrino beam. Due to the large size and high segmentation of the detectors, as well as a flexible system of program triggers and data acquisition, atmospheric neutrinos can be detected and studied in the NOvA. This paper presents a developed methodology for atmospheric neutrino registration in the far detector: it outlines the procedure for selecting and reconstructing triggers, calculates their efficiency for background and signal events, and finally, provides the expected energy spectrum of atmospheric neutrinos.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"448 - 452"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248300","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
Axion-like Scalar Field in Kantowski–Sachs Background Kantowski-Sachs背景下的类轴子标量场
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600721
Maxim Krasnov, Maxim Khlopov, Oem Trivedi
{"title":"Axion-like Scalar Field in Kantowski–Sachs Background","authors":"Maxim Krasnov,&nbsp;Maxim Khlopov,&nbsp;Oem Trivedi","doi":"10.1134/S1063778825600721","DOIUrl":"10.1134/S1063778825600721","url":null,"abstract":"<p>We consider Axion-like particle (ALP) model to construct numerical spatially homogeneous anisotropic Kantowski–Sachs cosmological model. We investigate the impact of model’s parameters on the behavior of the scalar field. We demonstrate that axion-like scalar field could behave differently, having an equation of state parameter (EoS) <span>(omega)</span> in the interval <span>(-1leqomegaleq 1)</span>.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"546 - 549"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248253","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
Interaction of Domain Walls with Scalar Particles in the Early Universe 早期宇宙中畴壁与标量粒子的相互作用
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600769
D. P. Filippov, A. A. Kirillov
{"title":"Interaction of Domain Walls with Scalar Particles in the Early Universe","authors":"D. P. Filippov,&nbsp;A. A. Kirillov","doi":"10.1134/S1063778825600769","DOIUrl":"10.1134/S1063778825600769","url":null,"abstract":"<p>The formation of solitons (such as closed domain walls) in the super-Early Universe is predicted in a number of theories of the formation of primordial black holes. However, the interaction of particles of the surrounding medium with the solitons should affect their dynamics. In the paper, we consider the interaction between domain walls and scalar particles which can play a role of dark matter. It is shown that when the temperature of the scalar particle gas, caused by the expansion of the Universe, decreases below a certain threshold value, the wall abruptly becomes opaque and locks particles inside itself. We discuss the dynamics of a single domain wall taking into account pressure of scalar particles locked inside a closed wall. It is shown, this effect leads to a time delay of domain wall collapse and the deferred formation of primordial black holes.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"540 - 545"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248139","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
Determination of Neutron Yield from ‘‘THICK’’ Be Target Irradiated with 21.5 MeV Protons Using a Proton Beam Monitoring System 用质子束监测系统测定21.5 MeV质子辐照“厚”Be靶的中子产额
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600642
Yu. E. Titarenko, A. A. Arkhipov, S. A. Balyuk, V. F. Batyaev, M. V. Batyaeva, V. D. Davidenko, V. M. Zhivun, Ya. O. Zaritskiy, A. A. Kovalishin, M. V. Kotelniy, A. S. Kirsanov, T. V. Kulevoy, I. V. Mednikov, B. A. Novikov, A. V. Orlov, K. V. Pavlov, V. S. Stolbunov, A. Yu. Titarenko, R. S. Tikhonov, M. N. Shlenskii, N. A. Kovalenko
{"title":"Determination of Neutron Yield from ‘‘THICK’’ Be Target Irradiated with 21.5 MeV Protons Using a Proton Beam Monitoring System","authors":"Yu. E. Titarenko,&nbsp;A. A. Arkhipov,&nbsp;S. A. Balyuk,&nbsp;V. F. Batyaev,&nbsp;M. V. Batyaeva,&nbsp;V. D. Davidenko,&nbsp;V. M. Zhivun,&nbsp;Ya. O. Zaritskiy,&nbsp;A. A. Kovalishin,&nbsp;M. V. Kotelniy,&nbsp;A. S. Kirsanov,&nbsp;T. V. Kulevoy,&nbsp;I. V. Mednikov,&nbsp;B. A. Novikov,&nbsp;A. V. Orlov,&nbsp;K. V. Pavlov,&nbsp;V. S. Stolbunov,&nbsp;A. Yu. Titarenko,&nbsp;R. S. Tikhonov,&nbsp;M. N. Shlenskii,&nbsp;N. A. Kovalenko","doi":"10.1134/S1063778825600642","DOIUrl":"10.1134/S1063778825600642","url":null,"abstract":"<p>The results of determining the neutron yield of the NS-21M facility, based on the I-2 linear proton accelerator and 3.8 mm thick Be target under bombardment by 21.5 MeV protons, are presented. This value was obtained by calculating the integral neutron flux passing through the front hemisphere at a specified distance from the center of the Be target relative to the average proton flux transmitted through a collimator of defined diameter. The experimental value of this quantity is <span>(Y_{n}^{{textrm{exp}}}=(1.35pm 0.09)times 10^{-2})</span>, while the calculated value <span>(Y_{n}^{{textrm{calc}}}=1.18times 10^{-2})</span> was derived by simulating the full mathematical model of the NS-21M stand using the PHITS-3.31 transport code. For 21.2 MeV protons, reaction cross-sections of <span>({}^{textrm{nat}}textrm{Cu}(p,x){}^{61})</span>Cu, <span>({}^{62})</span>Cu, and <span>({}^{64})</span>Cu were determined using the monitor reactions <span>({}^{textrm{nat}}textrm{Cu}(p,x){}^{62})</span>Zn and <span>({}^{textrm{nat}}textrm{Cu}(p,x){}^{63})</span>Zn. Simulated excitation functions for these reactions (TENDL-2023, JENDL-5, PADF-2, and PHITS-3.31 with the INCL model) were plotted over the 0.01–3 GeV range alongside experimental data from EXFOR.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"464 - 477"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248208","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
Dark Matter Around Primordial Black Holes 原始黑洞周围的暗物质
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S106377882560054X
Yu. N. Eroshenko
{"title":"Dark Matter Around Primordial Black Holes","authors":"Yu. N. Eroshenko","doi":"10.1134/S106377882560054X","DOIUrl":"10.1134/S106377882560054X","url":null,"abstract":"<p>Massive primordial black holes may have formed in the early universe, accounting for a small fraction of dark matter. Most of dark matter, however, may be composed of elementary particles or black holes with smaller masses. These objects could form dense spikes around the large black holes during the radiation-dominated phase of the universe’s evolution. Dark matter particles can annihilate in the spikes. In this study, we discuss the structure and properties of the spikes, considering their transformation due to annihilation. In the hybrid scenario involving black holes of various masses, small black holes can collide and merge in the central regions around larger black holes.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"520 - 523"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248210","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
Physical Effects Near a Wormhole 虫洞附近的物理效果
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600575
V. E. Kur’yan
{"title":"Physical Effects Near a Wormhole","authors":"V. E. Kur’yan","doi":"10.1134/S1063778825600575","DOIUrl":"10.1134/S1063778825600575","url":null,"abstract":"<p>One of the features of general relativity is the possible existence of space-time with a nontrivial topological and casual global structure. The real three-dimensional space might in principle be multiply connected and there might exist wormholes in it. The presence of a wormhole leads to the appearance of corrections to the Coulomb law. In the present work, an exact solution of the Laplace equation for a flat space with a wormhole whose mouths are spheres is found. It is shown that a point charge is attracted to the wormhole at all points in space except for the plane of symmetry. An analogy is noted between the attraction of a charge to the mouth of a wormhole and the attraction of a charge to a polarizable body. A freely moving charge experiences acceleration due to the presence of attraction to the mouth of a wormhole, which leads to the appearance of electromagnetic radiation.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"531 - 534"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248212","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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