The European Physical Journal A最新文献_第9页

Progress in the studies of cluster resonances by antisymmetrized molecular dynamics 用反对称分子动力学研究团簇共振的进展

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-06 DOI: 10.1140/epja/s10050-025-01499-4

Yasutaka Taniguchi, Tomoyuki Baba, Tadahiro Suhara, Masaaki Kimura, Yoshiko Kanada-En’yo

{"title":"Progress in the studies of cluster resonances by antisymmetrized molecular dynamics","authors":"Yasutaka Taniguchi, Tomoyuki Baba, Tadahiro Suhara, Masaaki Kimura, Yoshiko Kanada-En’yo","doi":"10.1140/epja/s10050-025-01499-4","DOIUrl":"10.1140/epja/s10050-025-01499-4","url":null,"abstract":"<div><p>This review reports recent advancements in the study of cluster resonances using Antisymmetrized Molecular Dynamics (AMD). Cluster states, appearing as resonances above the particle-decay threshold, are crucial for understanding exotic cluster structures and reactions. A critical aspect of these studies is the calculation of the reduced width amplitude (RWA), which has been challenging due to the complexity of nucleon exchange between clusters. We introduce two novel methods for the computation of the RWA; the Laplace expansion and norm overlap methods. They have enabled more precise and computationally efficient calculations of RWA. We introduce their successful applications to key astrophysical nuclear reactions, such as <span>(^{12}{textrm{C}}+ ^{12}{{textrm{C}}})</span> and <span>(^{12}{textrm{C}}+ ^{16}textrm{O})</span> fusion processes, which play a vital role in stellar environments. Furthermore, we explore how these methods have advanced the study of exotic cluster structures, including the linear chain of <span>(alpha )</span> clusters and the <span>( ^{6}textrm{He})</span> cluster in light nuclei.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Production of double strange hypernuclei and exotic nuclei in central Au+Au collisions at (sqrt{s_{NN}}) = 3 GeV 在(sqrt{s_{NN}}) = 3 GeV的Au+Au中心碰撞中双奇异超核和奇异核的产生

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-03 DOI: 10.1140/epja/s10050-025-01489-6

N. Buyukcizmeci, T. Reichert, A. S. Botvina, M. Bleicher

引用次数: 0

The utilization of magneto-hydrodynamics framework in expansion of magnetized viscous conformal flow 磁流体力学框架在磁化粘性保形流扩展中的应用

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-02 DOI: 10.1140/epja/s10050-025-01486-9

M. Karimabadi, A. F. Kord, B. Azadegan

{"title":"The utilization of magneto-hydrodynamics framework in expansion of magnetized viscous conformal flow","authors":"M. Karimabadi, A. F. Kord, B. Azadegan","doi":"10.1140/epja/s10050-025-01486-9","DOIUrl":"10.1140/epja/s10050-025-01486-9","url":null,"abstract":"<div><p>This study focuses on the evolution of magnetized quark–gluon plasma (QGP) within the framework of magneto-hydrodynamics (MHD). We investigate the temporal and spatial dynamics of QGP with additional second-order viscous corrections, considering the effects of a magnetic field generated during the early stages of relativistic heavy-ion collisions. In our analysis, we assume boost invariance along the beamline, represented by the <span>(z)</span>-coordinate, and fluid expansion along the <span>(x)</span>-direction. The magnetic field is assumed to be oriented perpendicular to the reaction plane, aligning with the <span>(y)</span>-direction. Additionally, we consider the fluid to have infinite electrical conductivity, simplifying the treatment of electromagnetic effects. To characterize the system, we solve the coupled Maxwell’s equations and the conservation equations of relativistic hydrodynamics. This approach allows us to elucidate the time and space dependence of key physical quantities, including the energy density, fluid velocity, and magnetic field within the transverse plane of the viscous, magnetized plasma. By deriving these quantities, we also compute the hadron spectra and perform a comparative analysis with experimental data to validate our theoretical predictions.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Benchmarking (mathbf {Lambda })NN three-body forces and first predictions for (A=3-5) hypernuclei 基准测试(mathbf {Lambda })神经网络三体力和(A=3-5)超核的首次预测

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-01 DOI: 10.1140/epja/s10050-024-01474-5

Hoai Le, Johann Haidenbauer, Hiroyuki Kamada, Michio Kohno, Ulf-G. Meißner, Kazuya Miyagawa, Andreas Nogga

引用次数: 0

Instrumentation for high-field dynamic nuclear polarization and electron paramagnetic resonance spectroscopy 高场动态核极化和电子顺磁共振波谱仪器

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-01-29 DOI: 10.1140/epja/s10050-025-01483-y

Thorsten Maly, Timothy J. Keller

引用次数: 0

The Felsenkeller shallow-underground laboratory for nuclear astrophysics 费尔森凯勒地下浅层核天体物理实验室

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-01-29 DOI: 10.1140/epja/s10050-025-01490-z

Daniel Bemmerer, Axel Boeltzig, Marcel Grieger, Katharina Gudat, Thomas Hensel, Eliana Masha, Max Osswald, Bruno Poser, Simon Rümmler, Konrad Schmidt, José Luis Taín, Ariel Tarifeño-Saldivia, Steffen Turkat, Anup Yadav, Kai Zuber

{"title":"The Felsenkeller shallow-underground laboratory for nuclear astrophysics","authors":"Daniel Bemmerer, Axel Boeltzig, Marcel Grieger, Katharina Gudat, Thomas Hensel, Eliana Masha, Max Osswald, Bruno Poser, Simon Rümmler, Konrad Schmidt, José Luis Taín, Ariel Tarifeño-Saldivia, Steffen Turkat, Anup Yadav, Kai Zuber","doi":"10.1140/epja/s10050-025-01490-z","DOIUrl":"10.1140/epja/s10050-025-01490-z","url":null,"abstract":"<div><p>In the Felsenkeller shallow-underground site, protected from cosmic muons by a 45 m thick rock overburden, a research laboratory including a 5 MV Pelletron ion accelerator and a number of radioactivity-measurement setups is located. The laboratory and its installations are described in detail. The background radiation has been studied, finding suppression factors of 40 for cosmic-ray muons, 200 for ambient neutrons, and 100 for the background in germanium <span>(gamma )</span>-ray detectors. Using an additional active muon veto, typically the background is just twice as high as in very deep underground laboratories. The properties of the accelerator including its external and internal ion sources and beam line are given. For the radioactivity counting setup, detection limits in the 10<span>(^{-4})</span> Bq range have been obtained. Practical aspects for the usage of the laboratory by outside scientific users are discussed.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01490-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Some results of 209Bi photoactivation experiment 209Bi光活化实验的一些结果

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-01-29 DOI: 10.1140/epja/s10050-024-01479-0

M. Krmar, R. Smolović, N. Jovančević, D. Maletić, Y. Teterev, S. Mitrofanov, K. D. Timoshenko, S. I. Alexeev, H. Marukyan, A. Hakobyan

{"title":"Some results of 209Bi photoactivation experiment","authors":"M. Krmar, R. Smolović, N. Jovančević, D. Maletić, Y. Teterev, S. Mitrofanov, K. D. Timoshenko, S. I. Alexeev, H. Marukyan, A. Hakobyan","doi":"10.1140/epja/s10050-024-01479-0","DOIUrl":"10.1140/epja/s10050-024-01479-0","url":null,"abstract":"<div><p>Photoactivation of a natural bismuth target was performed in bremsstrahlung beams with maximum energies of 40 MeV, 50 MeV and 60 MeV. Several products of (γ,xn) reactions were identified in the gamma spectra and saturation activities and flux averaged sections were calculated for them. The obtained values were compared with the results based on TALYS estimates of the cross sections of the observed reactions. TALYS estimates were calculated for all combinations of photon strength function and level density (a total of 54 of them) with the intention of evaluating which of them shows the best agreement with the experimental results. The minimum and maximum estimates of the saturation activity obtained from the 54 photon SF and LD model combinations differ in most cases by an order of magnitude. The experimental values fall within this range. At 60 MeV, the experimental values of the saturation activity are lower than most TALYS estimates. A similar result is observed at 50 MeV, but to a somewhat lesser extent, while at 40 MeV, approximately the same number of saturation activities obtained from the TALYS cross-sections give both higher and lower estimates compared to the experiment. The flux averaged cross sections calculated using the TENDL estimates are two to three times larger than the experimental ones. By comparing experimental and theoretical values of flux-averaged cross sections for the formation of <sup>206</sup>Bi, it was observed that good agreement was shown by those combinations of SF and LD models that are phenomenological in their formulation. No such trend was observed for other bismuth isotopes. There is a significant need to measure the cross sections of nuclear reactions with a higher multiplicity of emitted particles to provide experimental material for further development of models for calculating reaction cross sections.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Partial-wave analysis to determine the spin of (Xi (1690)^{-}) and (Xi (1820)^{-}) produced in (overline{p}p) annihilation 用部分波分析来确定(overline{p}p)湮灭中产生的(Xi (1690)^{-})和(Xi (1820)^{-})的自旋

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-01-28 DOI: 10.1140/epja/s10050-025-01492-x

Deepak Pachattu

引用次数: 0

Ab initio Bogoliubov many-body perturbation theory: closed-form constraint on the average particle number 从头算Bogoliubov多体微扰理论：平均粒子数的封闭约束

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-01-28 DOI: 10.1140/epja/s10050-024-01480-7

P. Demol, T. Duguet, A. Tichai

引用次数: 0

Charged hadron spectra and anisotropic flow from the AMPT model with shear viscous transport dynamics simulations at RHIC 基于AMPT模型的荷电强子谱和各向异性流动与RHIC剪切黏性输运动力学模拟