The European Physical Journal A最新文献_第7页

Impact of the nuclear equation of state on the formation of twin stars 核状态方程对孪生星形成的影响

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-11 DOI: 10.1140/epja/s10050-025-01497-6

Nai-Bo Zhang, Bao-An Li

引用次数: 0

Cross section and isomeric ratio measurements along with covariance analysis for the (n,2n) reactions on 120,130Te 120,130Te上（n,2n）反应的截面和同分异构体比测量及协方差分析

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-08 DOI: 10.1140/epja/s10050-025-01501-z

Junhua Luo, Long He, Liang Zhou, Li Jiang

{"title":"Cross section and isomeric ratio measurements along with covariance analysis for the (n,2n) reactions on 120,130Te","authors":"Junhua Luo, Long He, Liang Zhou, Li Jiang","doi":"10.1140/epja/s10050-025-01501-z","DOIUrl":"10.1140/epja/s10050-025-01501-z","url":null,"abstract":"<div>In this report, the cross sections of nuclear reactions 120Te(n,2n)119m,gTe and 130Te(n,2n)129m,gTe induced by d-T neutrons and their isomeric ratios (σm/σg) were measured. The pure ground state cross section (σg, for 130Te) deducted the effect from its isomeric transition. The off-line gamma-spectrum technique in conjunction with a high purity germanium (HPGe) detector was utilized to obtain the activity of the product radionuclides. The experiments were performed at the China Academy of Engineering Physics (CAEP). The K-400 neutron generator was used to produce neutrons with an energy of 13–15 MeV. The neutron fluence was monitored using the nuclear reaction 93Nb(n,2n)92mNb, which had a threshold energy that was similar to the reaction under study. A detailed covariance analysis was carried out for the cross sections of nuclear reactions 120Te(n,2n)119m,gTe and 130Te(n,2n)129m,gTe. All the measured cross sections were also determined using the theoretical calculation program TALYS-1.96 code with six level density models. The measured cross section values were compared with the results reported in the literature, along with the theoretical estimates and the evaluation results.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143370009","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

Negative moments as the signature of the radial density at small distances 负矩作为小距离径向密度的特征

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-08 DOI: 10.1140/epja/s10050-025-01496-7

M. Atoui, M. Hoballah, M. Lassaut, J. Van de Wiele

{"title":"Negative moments as the signature of the radial density at small distances","authors":"M. Atoui, M. Hoballah, M. Lassaut, J. Van de Wiele","doi":"10.1140/epja/s10050-025-01496-7","DOIUrl":"10.1140/epja/s10050-025-01496-7","url":null,"abstract":"<div>The present paper proposes a robust evaluation of any radial density at small distances using negative-order radial moments evaluated in momentum space. This evaluation provides a valuable insight into the behavior of a given radial density in the vicinity of (r=0), and puts strong emphasis on the importance of measuring form factors at large squared four-momentum transfer, a domain essential for the determination of negative order moments. A specific attention is paid to the regularization scheme directly affecting the numerical determination of the radial density’s parametrization. The proposed method is applied to non-relativistic study cases of the nucleon electric ((G_{En}, G_{Ep})), and proton magnetic (G_{Mp}) form factors. The validation is performed through comparison of the results of the approach to the analytically determined Maclaurin expansion - in the vicinity of (r=0) - of the radial density function. The method is also applied to the relativistic Dirac form factor ({{F_{1p}}}) of the proton. In such a non-trivial case, the Maclaurin development might not exist for the radial density, rendering the determination from the proposed method extremely important.</div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01496-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361665","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

Isovector properties of effective finite-range nuclear interactions 有效有限范围核相互作用的等矢量性质

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-07 DOI: 10.1140/epja/s10050-025-01491-y

D. Davesne, J. Navarro, A. Pastore, Y. Lallouet

引用次数: 0

On the equivalence of Prony and Lanczos methods for Euclidean correlation functions 论欧氏相关函数的 Prony 和 Lanczos 方法的等价性

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-07 DOI: 10.1140/epja/s10050-025-01495-8

J. Ostmeyer, A. Sen, C. Urbach

引用次数: 0

Nuclear photonics: overview and perspectives 核光子学：综述与展望

IF 2.6 3区物理与天体物理

The European Physical Journal A Pub Date : 2025-02-07 DOI: 10.1140/epja/s10050-025-01488-7

M. J. G. Borge, K. A. Tanaka, C. A. Ur, A. Zilges

引用次数: 0

Calculation of the abundance of (^{187}Re )–(^{187}Os ) nuclear clock nuclides in S-process and sensitivity analysis of Maxwellian-averaged neutron capture cross sections s过程中(^{187}Re ) - (^{187}Os )核钟核素丰度的计算及麦克斯韦平均中子俘获截面的灵敏度分析

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/s10050-025-01487-8

Xinyu Dong, Yixuan Qiu, Kaisu Wu

{"title":"Calculation of the abundance of (^{187}Re )–(^{187}Os ) nuclear clock nuclides in S-process and sensitivity analysis of Maxwellian-averaged neutron capture cross sections","authors":"Xinyu Dong, Yixuan Qiu, Kaisu Wu","doi":"10.1140/epja/s10050-025-01487-8","DOIUrl":"10.1140/epja/s10050-025-01487-8","url":null,"abstract":"<div>In this paper, the network equations calculation of (^{187}Re)–(^{187}Os) clock-related nuclide abundance in s-process is studied, and the sensitivities of Maxwellian-averaged neutron capture cross sections for each nuclide are analyzed in detail. Firstly, basing nuclear physical parameters, we give the branching s-process reaction network from (^{184}W ) to (^{190}Os ), and establish the corresponding network equations. Using a single path s-process approximation, we obtain an analytical expression of the seed nuclide (^{183}W ) abundance of our branching network. Because of the stiffness of the system of network equations, we use the semi-implicit Runge–Kutta method to give the numerical solution of the network equations, and thus obtain the abundance of each nuclide related to the (^{187}Re )–(^{187}Os ) nuclear clock in the s-process. Finally, with the numerical solution, the sensitivity analysis of the Maxwellian-averaged neutron capture cross sections of the nuclear reaction involved in the (^{187}Re )–(^{187}Os ) nuclear clock network equations is carried out. Therefore, we find that in s-process, the neutron capture reaction ( ^{184} W+n rightarrow ^{185}W ) has the greatest influence on the (^{187}Re )–(^{187}Os ) nuclear clock reaction network, and the neutron capture reaction (^{186} W+n rightarrow ^{187}W ) has the greatest effect on the particular nuclides (^{187}Re ) and (^{187}Os ). So the measurements of these two Maxwellian-averaged neutron capture cross sections deserve the attention of experimental nuclear physicists.</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":"143362045","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

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>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 (^{12}{textrm{C}}+ ^{12}{{textrm{C}}}) and (^{12}{textrm{C}}+ ^{16}textrm{O}) 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 (alpha ) clusters and the ( ^{6}textrm{He}) cluster in light nuclei.</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>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 (z)-coordinate, and fluid expansion along the (x)-direction. The magnetic field is assumed to be oriented perpendicular to the reaction plane, aligning with the (y)-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.</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