Nuclear Physics A最新文献

英文中文

The role of nuclear symmetry energy and neutron skin thickness of 208Pb in controlling the underlying physics of neutron star 核对称能和208Pb的中子蒙皮厚度在中子星基础物理控制中的作用

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-17 DOI: 10.1016/j.nuclphysa.2025.123307

Queena, Mukul Kumar, Sunil Kumar, Raj K. Jagota, Shashi K. Dhiman

The nuclear symmetry energy is fundamental in nuclear astrophysics, influencing phenomena from nuclear structure to gravitational collapse and neutron star formation. Both the symmetry energy and its linear density dependence (L), are critical inputs for numerous nuclear physics and astrophysics applications, as they play a key role in determining properties such as neutron skin thickness (Δr_np) and neutron star radius. Recent results from parity-violating electron scattering experiments on ²⁰⁸Pb (PREX-II: The Lead Radius Experiment)) have offered new insights into these fields. Specifically, the PREX-II experiment has provided a neutron skin thickness for ²⁰⁸Pb of

Δ r_{n p} = 0.283 \pm 0.071

fm. This measurement helps to constrain the nuclear symmetry energy in laboratory environments. In this study, we propose several interactions (SRQs) based on relativistic energy density functionals that correspond to different values of Δr_np for ²⁰⁸Pb, as derived from the PREX-II limits. We observe a correlation between Δr_np of ²⁰⁸Pb and L. We compute the equations of state for nucleonic matter under β - equilibrium conditions for proposed interactions. We also discuss in detail the effects of Δr_np and L on nuclear matter and neutron star properties. Additionally, these interactions are utilized to explore the characteristics of rotating neutron stars.

核对称能是核天体物理学的基础，影响着从核结构到引力坍缩和中子星形成的各种现象。对称能和它的线性密度依赖关系(L)都是许多核物理和天体物理应用的关键输入，因为它们在确定中子表皮厚度（Δrnp）和中子星半径等特性方面起着关键作用。最近在208Pb上进行的违反宇称的电子散射实验（PREX-II：铅半径实验）的结果为这些领域提供了新的见解。具体来说，PREX-II实验为208Pb提供了Δrnp=0.283±0.071 fm的中子皮厚。这种测量有助于约束实验环境下的核对称能。在这项研究中，我们提出了几种基于相对论能量密度泛函的相互作用（srq），它们对应于208Pb的不同值Δrnp，这些值来自PREX-II极限。我们观察到208Pb和l的Δrnp之间存在相关性。我们在β -平衡条件下计算了核物质的状态方程。我们还详细讨论了Δrnp和L对核物质和中子星性质的影响。此外，这些相互作用被用来探索旋转中子星的特性。

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引用次数: 0

Bohr-Mottelson Hamiltonian with octic potential applied to the 106−116Cd isotopes 带光势的玻尔-莫特尔森哈密顿量应用于106−116Cd同位素

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-16 DOI: 10.1016/j.nuclphysa.2025.123311

P. Buganu , R. Budaca

The Bohr-Mottelson Hamiltonian, with an octic potential in the β deformation variable, is numerically solved for a γ-unstable symmetry of the nuclear system. The analytical structure of the model allows the description of multiple phenomena of great interest for the nuclear structure such as ground-state shape phase transitions and their critical points, dynamical shape phase transitions, shape coexistence with and without mixing, anomalous in-band E2 transitions, large E2 intra-band transitions and large monopole transition between the first excited

0^{+}

state and the ground state, respectively. As a first application of the present model is selected the

^{106 - 116}

Cd isotopic chain known in literature to manifest shape phase transition, respectively shape coexistence and mixing.

对核系统的γ-不稳定对称性的Bohr-Mottelson哈密顿量进行了数值求解。该模型的解析结构允许描述对核结构非常感兴趣的多种现象，如基态形状相变及其临界点、动态形状相变、混合和不混合的形状共存、带内异常E2相变、带内大E2相变以及第一激发态与基态之间的大单极子相变。作为本模型的第一个应用，选择了文献中已知的106−116Cd同位素链，分别表现为形状相变，形状共存和混合。

引用次数: 0

Cross-section measurement of 181Ta(n,γ)182Ta with covariance analysis 181Ta(n,γ)182Ta的横截面测量与协方差分析

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-16 DOI: 10.1016/j.nuclphysa.2025.123312

Mahima Upadhyay , Punit Dubey , Mahesh Choudhary , Namrata Singh , Shweta Singh , Sriya Paul , G. Mishra , G. Mohanto , Sukanya De , L.S. Danu , B. Lalremruata , Yu N. Kopatch , I.N. Ruskov , Ajay Kumar , R.G. Thomas , A. Kumar

The current study presents the cross-section measurement of ¹⁸¹Ta(n,γ)¹⁸²Ta reaction at 1.37  ±  0.13, 2.06  ±  0.14, 2.56  ±  0.15, and 3.05  ±  0.17 MeV neutron energies utilizing offline γ-ray spectroscopy. The neutrons were generated through the ⁷Li(p,n)⁷Be reaction. The ¹¹⁵In(n,n’γ)^115mIn reaction served as a monitor reaction. The present study provides detailed information on the propagation of uncertainty in the overall result. The required corrections for low energy background neutron and γ-ray coincidence summing effect have been made in the present measurement. The output is compared with the pre-existing cross-section data from the EXFOR database, evaluated data libraries and theoretical model predictions like level density models and γ-ray strength functions.

本研究利用脱机γ射线能谱法测量了181Ta(n,γ)182Ta反应在1.37 ± 0.13,2.06 ± 0.14,2.56 ± 0.15和3.05 ± 0.17 MeV中子能量下的截面。中子是通过7Li(p,n)7Be反应产生的。115In(n,n′γ)115mIn反应作为监测反应。本研究提供了总体结果中不确定性传播的详细信息。对低能背景中子和γ射线的重合和效应进行了必要的修正。输出结果与EXFOR数据库中已有的截面数据、评估数据库和理论模型预测（如水平密度模型和γ射线强度函数）进行比较。

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引用次数: 0

Collective enhancement in nuclear level density and shape transitions in 169Tm 169Tm中核能级密度和形状转变的集体增强

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-16 DOI: 10.1016/j.nuclphysa.2025.123309

V. Parvathi, A. K. Rhine Kumar

Collective enhancement in nuclear level density (CELD) is a key phenomenon in the calculation of nuclear level density (NLD) arising from the coupling of intrinsic excitations with collective rotational and vibrational modes. This effect is especially pronounced in well-deformed nuclei, where rotational motion significantly increases the density of states at low excitation energies. However, increasing excitation energy leads to a gradual fadeout of this enhancement. In this study, we investigate CELD and its fadeout in the ¹⁶⁹Tm nucleus, using the Finite-Temperature BCS (FTBCS) approach to calculate the intrinsic level density and incorporating rotational effects through a deformation-dependent enhancement factor. By examining free energy surfaces and shape transitions across different excitation energies and angular momenta, we aim to investigate the relationship between nuclear deformation and the emergence or suppression of collective effects. The results provide a comprehensive understanding of how shape evolution influences CELD behaviour in excited nuclear systems. However, the theoretically predicted fadeout energy is significantly higher than the experimentally observed value.

核能级密度集体增强（CELD）是计算核能级密度（NLD）的一个关键现象，它是由于本征激励与集体旋转和振动模式的耦合而产生的。这种效应在形变良好的原子核中尤其明显，在那里旋转运动显著地增加了低激发能态的密度。然而，增加激发能导致这种增强逐渐消退。在这项研究中，我们使用有限温度BCS （FTBCS）方法来计算内在能级密度，并通过变形相关的增强因子纳入旋转效应，研究了169Tm核中的CELD及其衰减。通过考察不同激发能和角动量下的自由能表面和形状转变，我们旨在研究核变形与集体效应的产生或抑制之间的关系。结果提供了一个全面的理解如何形状演变影响CELD行为在激发核系统。然而，理论预测的衰减能量明显高于实验观测值。

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引用次数: 0

Optimizing electron bunch characteristics through longitudinal density tailoring in laser wakefield acceleration 激光尾流场加速中纵向密度裁剪优化电子束特性

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-13 DOI: 10.1016/j.nuclphysa.2025.123308

Ravina, Devki Nandan Gupta

We investigate advanced electron acceleration in the laser wakefield acceleration (LWFA) regime by exploiting longitudinally tailored plasma density profiles. By engineering the plasma density along the propagation direction, we demonstrate the enhanced control over the injection dynamics and subsequent acceleration of electron bunches. Using a parabolic longitudinal density profile, we show that both the energy and quality of the accelerated electron beams–characterized by energy spread and emittance can be significantly optimized. The study reveals a powerful synergy between the longitudinal plasma density gradient and electron bunch properties, enabling beam characteristics suitable for high-precision applications. Our results provide a practical pathway for designing plasma channels that maximize energy gain while maintaining beam quality, offering new strategies for next-generation compact electron accelerators.

我们通过利用纵向定制等离子体密度分布来研究激光尾流场加速（LWFA）机制中的高级电子加速。通过设计等离子体密度沿传播方向，我们证明了对注入动力学和随后的电子束加速的增强控制。利用抛物线纵向密度曲线，我们发现加速电子束的能量和质量——以能量扩散和发射度为特征——都可以得到显著优化。该研究揭示了纵向等离子体密度梯度和电子束特性之间的强大协同作用，使光束特性适合高精度应用。我们的研究结果为等离子体通道的设计提供了一条实用的途径，使能量增益最大化，同时保持束流质量，为下一代紧凑型电子加速器提供了新的策略。

引用次数: 0

Corrigendum to “Macroscopic-microscopic analysis of deformation energy, Q20 electric quadrupole moments, and equilibrium shapes in even-even barium and cerium isotopes” [Nuclear Physics A, Volume 1062, 2025, 123172] “变形能的宏观-微观分析，Q20电四极矩，平衡形状在偶数钡和铈同位素”的勘误表[核物理学A卷1062,2025,123172]

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-08 DOI: 10.1016/j.nuclphysa.2025.123304

Hadj Mouloudj , Fethi Redjem , Oussama Zeggai , Mousaab Belarbi , Youcef Belgaid , Abdelkader Ghalem

引用次数: 0

Elastic scattering of α-particles from nα-cluster nuclei using the high-energy approximation and São Paulo potential 基于高能近似和<s:1>圣保罗势的nα团簇核α-粒子弹性散射

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-04 DOI: 10.1016/j.nuclphysa.2025.123306

Awad A Ibraheem , M.N. El-Hammamy , F. Algahatani , Rehab Yajzey , Sh. Hamada , A. Attia

This work investigates α-particle elastic scattering from nα-cluster nuclei (¹²C - ⁴⁰Ca, n = 3–10) at 240 MeV, 386 MeV, with emphasis on refining the α-nucleus optical potential. The relative wave function of the alpha-cluster is used to derive cluster densities for constructing the High-Energy Approximation (HEA) and São Paulo (SPP) potentials. The excellent agreement between theoretical results and experimental data highlights the strength of these methods in describing α-nucleus interactions and underscores their relevance in nuclear reaction studies.

本文研究了nα-团簇核（12C - 40Ca, n = 3-10）在240 MeV， 386 MeV下α-粒子的弹性散射，重点研究了α-核光势的细化。利用α -簇的相对波函数推导出簇密度，用于构造高能近似（HEA）和圣保罗（SPP）势。理论结果和实验数据之间的良好一致性突出了这些方法在描述α-核相互作用方面的优势，并强调了它们在核反应研究中的相关性。

引用次数: 0

Fission of pre-actinide nucleus 206Po 前锕系核206Po的裂变

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-01 DOI: 10.1016/j.nuclphysa.2025.123286

Lakhyajit Sarma , K. Kalita , Harun Al Rashid , Amar Das , Nabendu K. Deb , M. Bhuyan , A. Jhingan , K.S. Golda , N. Saneesh , M. Kumar , P. Sugathan

Fission fragment mass distributions have been measured for the reaction ³⁰Si + ¹⁷⁶Yb at near-Coulomb barrier energies to investigate the onset of quasifission. The measured mass distributions exhibit a single-Gaussian profile, and the extracted variances have been compared with calculations based on the Statistical Saddle Point Model (SSPM). The experimentally observed mass variances are significantly larger than the values predicted by the fusion-fission model, indicating the presence of quasifission in the studied energy range.

在近库仑势垒能下测量了30Si + 176Yb反应的裂变碎片质量分布，以研究准裂变的开始。测量的质量分布呈现单高斯分布，并将提取的方差与基于统计鞍点模型（SSPM）的计算进行了比较。实验观测到的质量方差明显大于聚变-裂变模型预测的值，表明在研究的能量范围内存在准裂变。

引用次数: 0

Insights into triaxial collectivity of odd-mass 111−119Sb isotopes 对奇质量111−119Sb同位素三轴集体的认识

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-01 DOI: 10.1016/j.nuclphysa.2025.123299

Aneeqa Basheer , Ritvik Gupta , Manvi Rajput , Suram Singh , G.H. Bhat , Pankaj Kumar , Arun Bharti , J.A. Sheikh

High-spin structures of odd-mass

^{111 - 119}

Sb isotopes are investigated using the Triaxial Projected Shell Model (TPSM), with deformation parameters extracted from constrained Covariant Density Functional Theory (CDFT) calculations. The band diagrams exhibit characteristic crossings between one- and three-quasiparticle (1-qp and 3-qp) configurations in the mid-spin region, which are explained through the evolution of 3-qp wavefunction amplitudes. These structural changes are reflected in alignment diagrams, signature splitting and transition probabilities. The study demonstrates the necessity of including multi-quasiparticle configurations in the model basis to accurately reproduce experimentally observed electromagnetic transition rates particularly in ¹¹³Sb. Angular momentum projections, evaluated across three intrinsic sectors, provide direct evidence for triaxiality in this isotope. Overall, this work offers new insights into the influence of triaxial deformation and quasiparticle dynamics on the rotational behavior of Sb nuclei near the Z = 50 shell closure.

利用三轴投影壳模型（TPSM）研究了奇质量111−119Sb同位素的高自旋结构，并从约束协变密度泛函理论（CDFT）计算中提取了变形参数。带图显示了中自旋区域中一个和三个准粒子（1-qp和3-qp）构型之间的特征交叉，这可以通过3-qp波函数振幅的演变来解释。这些结构变化反映在对齐图、签名分裂和转移概率中。研究表明，为了准确再现实验观测到的电磁跃迁速率，特别是在113Sb中，必须在模型基础上加入多准粒子组态。在三个本征扇区进行的角动量预测为该同位素的三轴性提供了直接证据。总的来说，这项工作为三轴变形和准粒子动力学对Sb核在Z = 50壳闭合附近的旋转行为的影响提供了新的见解。

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引用次数: 0

Elastic scattering and inclusive α angular distributions for 6Li+93Nb system around the Coulomb barrier 库仑势垒周围6Li+93Nb体系的弹性散射和包涵α角分布

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-12-01 DOI: 10.1016/j.nuclphysa.2025.123303

Arati Chavan , S. Rathi , K. Mahata , S.K. Pandit , V.V. Parkar , A. Shrivastava , K. Ramachandran , Sangeeta Dhuri , Satbir Kaur , Prasanna M , Vineet Kumar

Elastic scattering and inclusive α particle angular distributions were measured for ⁶Li+⁹³Nb system at lab energies of 24.6 MeV and 34.7 MeV. Optical model analysis of the measured elastic scattering angular distributions were analysed to extract the reaction cross sections. The energy and angle integrated α particle cross sections were determined. The reaction cross sections and the α production cross sections from the present measurement are compared with the available experimental data for ⁶Li projectile on various targets, to study the systematic behaviour. Extracted reaction cross sections from the optical model fits and the measured inclusive α agree very well with the systematic behaviour of reaction cross section and inclusive α production cross sections (due to non-compound nuclear process), respectively.

在实验室能量分别为24.6 MeV和34.7 MeV时，测量了6Li+93Nb体系的弹性散射和包包α粒子角分布。对测量的弹性散射角分布进行光学模型分析，提取反应截面。测定了α粒子的能量和角度积分截面。将测量得到的反应截面和α生成截面与已有的6Li弹丸在不同靶上的实验数据进行了比较，以研究其系统行为。从光学模型中提取的反应截面和测量的包涵α分别与反应截面和包涵α产生截面（由于非复合核过程）的系统行为吻合良好。

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全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

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Nuclear Physics A

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