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Photoneutron Reaction Cross Sections for ({}^{{115}})In ({}^{{115}}) In的光子中子反应截面
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600757
V. V. Varlamov, A. I. Davydov, I. A. Mostakov, V. N. Orlin
{"title":"Photoneutron Reaction Cross Sections for ({}^{{115}})In","authors":"V. V. Varlamov,&nbsp;A. I. Davydov,&nbsp;I. A. Mostakov,&nbsp;V. N. Orlin","doi":"10.1134/S1063778825600757","DOIUrl":"10.1134/S1063778825600757","url":null,"abstract":"<p>New data for cross sections of partial reactions (<span>(gamma,1n)</span>) and (<span>(gamma,2n)</span>) were obtained using both published data for neutron yield cross section <span>(sigma(gamma,xn)=sigma(gamma,1n)+2sigma(gamma,2n))</span> and total photoneutron reaction cross section <span>(sigma(gamma,sn)=sigma(gamma,1n))</span> + <span>(sigma(gamma,2n))</span> determined in experiment on the bremsstrahlung beam. The investigation of reliability of those cross sections was carried out using the experimental-theoretical method for partial reaction cross section evaluation based on physical criteria. It was found that new evaluated cross sections of the reactions <span>({}^{115})</span>In(<span>(gamma,1n)</span>)<span>({}^{114})</span>In and <span>({}^{115})</span>In(<span>(gamma,2n)</span>)<span>({}^{113})</span>In meeting physical criteria of reliability differ in a certain way from experimental ones. The comparison of new evaluated data with the results of analogous evaluation based on the results for partial reaction cross sections for <span>({}^{115})</span>In obtained in experiment on the beam of quasi-monoenergetic annihilation photons shows that both evaluations are close.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"389 - 397"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248140","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
Unruh Effect and Minimum Viscosity Unruh效应和最小粘度
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600848
Dmitry D. Lapygin, Georgy Yu. Prokhorov
{"title":"Unruh Effect and Minimum Viscosity","authors":"Dmitry D. Lapygin,&nbsp;Georgy Yu. Prokhorov","doi":"10.1134/S1063778825600848","DOIUrl":"10.1134/S1063778825600848","url":null,"abstract":"<p>The Minkowski vacuum is perceived by an accelerated observer as a medium with a finite temperature, which is the essence of the well-known Unruh effect. It turns out that in addition to temperature, a finite shear viscosity appears in the accelerated system, and this viscosity satisfies the lower limit from string theory <span>(eta/s=1/4pi)</span>. We describe the derivation of the corresponding shear viscosity for electromagnetic field.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"506 - 512"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248209","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
Relic Gravitational Waves in Cosmological Models Based on Einstein–Gauss–Bonnet Gravity 基于爱因斯坦-高斯-庞内引力的宇宙学模型中的残余引力波
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600939
G. D. Manucharyan, I. V. Fomin, V. O. Gladyshev, V. L. Kauts
{"title":"Relic Gravitational Waves in Cosmological Models Based on Einstein–Gauss–Bonnet Gravity","authors":"G. D. Manucharyan,&nbsp;I. V. Fomin,&nbsp;V. O. Gladyshev,&nbsp;V. L. Kauts","doi":"10.1134/S1063778825600939","DOIUrl":"10.1134/S1063778825600939","url":null,"abstract":"<p>A special class of solutions of the equations of cosmological dynamics implying analytic connection between inflationary models in the framework of general relativity and Einstein–Gauss–Bonnet gravity is considered. The possibility of verification of such models by direct observation of relic gravitational waves, the spectrum of which is determined by the parameters of the model was analyzed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"500 - 505"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248162","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
Coalescence of Primordial Black Holes at High Redshifts with Clustering 高红移原始黑洞的聚类合并
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600794
Viktor Stasenko
{"title":"Coalescence of Primordial Black Holes at High Redshifts with Clustering","authors":"Viktor Stasenko","doi":"10.1134/S1063778825600794","DOIUrl":"10.1134/S1063778825600794","url":null,"abstract":"<p>The observation of gravitational waves from cosmological distances is one of the future tools for testing the hypothesis of the existence of primordial black holes (PBHs). Their clustering plays a decisive role in predicting their mergers. We show that in this case the merger rate differs from the predictions of the model without initial clustering. Also, our results on the merger rate are sensitive to the parameters of the PBH cluster formation models. Future observations of black hole mergers at high redshifts will be able to test the possibility of PBH clustering.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"524 - 530"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248211","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
SND@LHC in 2025 and Beyond 2025年及以后的SND@LHC
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825700498
A. B. Alexandrov, S. A. Gorbunov, N. S. Konovalova, D. N. Morozova, N. M. Okateva, N. G. Polukhina, N. I. Starkov, E. N. Starkova, M. M. Chernavskiy, T. V. Shchedrina
{"title":"SND@LHC in 2025 and Beyond","authors":"A. B. Alexandrov,&nbsp;S. A. Gorbunov,&nbsp;N. S. Konovalova,&nbsp;D. N. Morozova,&nbsp;N. M. Okateva,&nbsp;N. G. Polukhina,&nbsp;N. I. Starkov,&nbsp;E. N. Starkova,&nbsp;M. M. Chernavskiy,&nbsp;T. V. Shchedrina","doi":"10.1134/S1063778825700498","DOIUrl":"10.1134/S1063778825700498","url":null,"abstract":"<p>The SND@LHC (Scattering and Neutrino Detector at the Large Hadron Collider) experiment studies processes involving neutrinos generated at the LHC in the pseudorapidity range of <span>(7.2&lt;eta&lt;8.6)</span>. The detector includes a target having a mass of 830 kg and consisting of tungsten plates interspersed with emulsion and electronic detectors, which is followed downstream by a hadronic calorimeter and a muon-detecting system. The detector structure provides a unique possibility for studying charm production in the pseudorapidity region inaccessible to other experiments at the LHC. The modern state of the experiment and its prospects for the near future are described in the present study.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"434 - 442"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248236","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
Estimation of Systematic Uncertainties for the Data Analysis in the Near Detector of the T2K Neutrino Experiment T2K中微子实验近探测器数据分析的系统不确定度估计
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600629
D. Fedorova, A. Izmaylov
{"title":"Estimation of Systematic Uncertainties for the Data Analysis in the Near Detector of the T2K Neutrino Experiment","authors":"D. Fedorova,&nbsp;A. Izmaylov","doi":"10.1134/S1063778825600629","DOIUrl":"10.1134/S1063778825600629","url":null,"abstract":"<p>The near detector ND280 is an essential part of the T2K experiment. Its data are used to tune the parameters of the cross-section and flux models, thereby reducing systematic uncertainties and enhancing the precision of neutrino oscillation measurements. ND280 is a complex apparatus consisting of several subdetectors. The structure leads to various sources of systematic uncertainties related to the simulation and tracking of neutrino interaction products. This paper presents the methods used to estimate the systematic errors and to propagate them through the stages towards the final oscillation analysis.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"430 - 433"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248250","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
Ultralight Axion or Axion-Like Particle Dark Matter and 21-cm Absorption Signals in New Physics 新物理学中的超轻轴子或类轴子粒子暗物质和21厘米吸收信号
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600666
C. R. Das
{"title":"Ultralight Axion or Axion-Like Particle Dark Matter and 21-cm Absorption Signals in New Physics","authors":"C. R. Das","doi":"10.1134/S1063778825600666","DOIUrl":"10.1134/S1063778825600666","url":null,"abstract":"<p>A hypothetical particle known as the axion holds the potential to resolve both the cosmic dark matter riddle and particle physics’ long-standing, strong CP dilemma. An unusually strong 21-cm absorption feature associated with the initial star formation era, i.e., the dark ages, may be due to ultralight axion dark matter (<span>({sim}10^{-22})</span> eV) at this time. The radio wave observation’s 21-cm absorption signal can be explained as either anomalous baryon cooling or anomalous cosmic microwave background photon heating. Shortly after the axions or axion-like particles (ALPs) thermalize among themselves and form a Bose–Einstein condensate, the cold dark matter ALPs make thermal contact with baryons, cooling them. ALPs are thought to be the source of some new evidence for dark matter, as the baryon temperature at cosmic dawn was lower than predicted based on presumptions. The detection of baryon acoustic oscillations is found to be consistent with baryon cooling by dark matter ALPs. Simultaneously, under the influence of the primordial black hole and/or intergalactic magnetic fields, the dark radiation composed of ALPs can resonantly transform into photons, significantly heating up the radiation in the frequency range relevant to the 21-cm tests. When examining the 21-cm cosmology at redshifts <span>(z)</span> between 200 and 20, we see that, when taking into account both heating and cooling options at the same time, heating eliminated the theoretical excess number of neutrino species, <span>(Delta N_{text{eff}})</span>, from the cooling effect.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"550 - 555"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248254","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
Neutrino Scattering on Superfluid Helium with Account for Neutrino Electromagnetic Properties and Collective Effects 考虑中微子电磁特性和集体效应的超流氦上的中微子散射
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600836
Konstantin Kouzakov, Fedor Lazarev, Alexander Studenikin, Maxim Vyalkov, Arkady Yukhimchuk
{"title":"Neutrino Scattering on Superfluid Helium with Account for Neutrino Electromagnetic Properties and Collective Effects","authors":"Konstantin Kouzakov,&nbsp;Fedor Lazarev,&nbsp;Alexander Studenikin,&nbsp;Maxim Vyalkov,&nbsp;Arkady Yukhimchuk","doi":"10.1134/S1063778825600836","DOIUrl":"10.1134/S1063778825600836","url":null,"abstract":"<p>Superfluid He-4 is a promising tool for neutrino and dark matter detection. The low-energy neutrino interaction with superfluid He-4 proceeds through coherent elastic neutrino–atom scattering (CE<span>(nu)</span>AS), which has not yet been observed. The first experimental study of CE<span>(nu)</span>AS is under preparation in Sarov using a tritium neutrino source and a superfluid He-4 detector. This will allow testing the neutrino physics of the Standard Model and beyond at unprecedentedly low energies. We develop a theoretical approach for studying neutrino interaction with a superfluid He-4, taking into account single quasiparticle (phonon and roton) production in the target upon tritium neutrino scattering. We show that such collective effects significantly affect the neutrino scattering cross section at energy transfers of the order of 1 meV and less.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"556 - 559"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248255","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
Charge Losses in SiC and Si Detectors at Registration of Heavy Ions 重离子登记时SiC和Si探测器的电荷损失
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600812
S. A. Evseev, B. A. Chernyshev, Yu. B. Gurov, M. S. Dovbnenko, S. V. Rozov, V. G. Sandukovsky
{"title":"Charge Losses in SiC and Si Detectors at Registration of Heavy Ions","authors":"S. A. Evseev,&nbsp;B. A. Chernyshev,&nbsp;Yu. B. Gurov,&nbsp;M. S. Dovbnenko,&nbsp;S. V. Rozov,&nbsp;V. G. Sandukovsky","doi":"10.1134/S1063778825600812","DOIUrl":"10.1134/S1063778825600812","url":null,"abstract":"<p>The results of measurements of charge losses at registration of xenon ions (<span>({}^{132})</span>Xe) with the energies of 44.5, 81.5 and 165 MeV in the detectors based on silicon carbide (SiC) and silicon (Si) are presented. The measured values of the amplitude defect for SiC and Si detectors are 43 and 21<span>(%)</span> of the true <span>({}^{132})</span>Xe ion energy, respectively. The reason is the incomplete collection of charge carriers due to their recombination in a dense track of the heavy ion being detected.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"489 - 493"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248256","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
NOvA Recent Results of Three-Flavor Oscillation Analysis NOvA三味振荡分析的最新结果
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2025-10-09 DOI: 10.1134/S1063778825600654
Anastasiia Kalitkina, NOvA Collaboration
{"title":"NOvA Recent Results of Three-Flavor Oscillation Analysis","authors":"Anastasiia Kalitkina,&nbsp;NOvA Collaboration","doi":"10.1134/S1063778825600654","DOIUrl":"10.1134/S1063778825600654","url":null,"abstract":"<p>The NOvA experiment is a long-baseline neutrino experiment designed to study the oscillation behavior of neutrinos and antineutrinos, utilizing Fermilab’s Megawatt-capable NuMI neutrino beam. Over the past 10 years, NOvA has collected data from two functionally identical tracking calorimeter detectors, which are situated off the NuMI beam axis and separated by 810 km. The construction of the experiment enables observation of muon (anti)neutrino disappearance and electron (anti)neutrino appearance. Consequently, precision measurements of oscillation parameters, including the mass splitting <span>(Delta m_{32}^{2})</span> and its sign, the mixing angle <span>(theta_{23})</span>, and the phase of <span>(CP)</span>-symmetry violation, can be obtained. This paper presents an overview of the NOvA experiment and its latest results.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"443 - 447"},"PeriodicalIF":0.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248362","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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