In this paper, we investigate the possibility to study the famous charged charmonium-like state production off nuclear targets and its properties in inclusive photon-induced reactions near the kinematic threshold within the collision model based on the nuclear spectral function. The model accounts for its charged components production in direct photon–nucleon interactions as well as three different popular scenarios for their internal structures: compact tetraquarks, molecules of the two open-charm mesons and mixtures of both of them. We calculate the absolute and relative excitation functions for production of mesons on 12C and 184W target nuclei at initial photon energies of 9.0–17.5 GeV, the absolute momentum differential cross sections and their ratios for the production off these target nuclei at laboratory polar angles of 0∘–10∘ and at photon energy of 14 GeV as well as the A-dependences of the ratios of the total cross sections for production at photon energy of 14 GeV within the adopted scenarios for the internal structures. Our results in particular indicate that the total cross sections for production have at above threshold photon energies of ∼ 13–17 GeV a well measurable strengths ∼ 50–200 (50–200) and 200–1500 (300–2000) nb for carbon and tungsten target nuclei, respectively. Therefore, one might expect to measure these strengths at the upgraded up to 22 GeV CEBAF facility. We also demonstrate that the absolute and relative observables considered show a certain sensitivity to the
在本文中，我们探讨了在基于核谱函数的碰撞模型中，研究著名的带电类charmonium态Zc（3900）在接近运动阈值的包涵光子诱导反应中的产生及其性质的可能性。该模型解释了其带电组分Zc（3900）±在光子-核子直接相互作用中的产生，以及它们内部结构的三种不同的流行情况：紧致四夸克、两个开粲介子的分子和两者的混合物。我们计算了12C和184W靶核在初始光子能量为9.0-17.5 GeV时产生Zc（3900）±介子的绝对和相对激发函数。Zc（3900）±这些靶核在0°-10°和14 GeV光子能量下产生的绝对动量微分截面及其比值，以及Zc（3900）±14 GeV光子能量下产生的总截面之比在Zc（3900）±内部结构所采用的方案中的a依赖性。我们的研究结果特别表明，Zc(3900)+(Zc(3900)−)产生的总截面在阈值光子能量为~ 13-17 GeV以上时，碳和钨靶核的强度分别为~ 50-200（50-200）和200-1500 (300-2000)nb。因此，人们可能期望在升级到22 GeV的CEBAF设施上测量这些强度。我们还证明，所考虑的绝对和相对观测值对Zc（3900）±内部结构有一定的敏感性，这是迄今为止最著名的。因此，将它们与未来在上述设施进行的高精度实验数据进行比较，可能有助于确定这些结构，这是强子物理学界非常关注的问题。
引用次数: 0
Characterizing nuclear pasta with alpha shapes
用α形状表征核面食
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-21
DOI: 10.1016/j.nuclphysa.2025.123225
Nuclear pasta structures, which emerge in large nucleon systems at subsaturation densities and near-zero temperatures, have traditionally been analyzed using Minkowski Functionals, particularly through the correlation between Curvature and Euler Characteristic. Previous methods relied on cubic voxelization to create three-dimensional bodies from nuclear theory data points, leading to inaccurate estimations of geometric properties. This work introduces the alpha shapes method as a superior alternative for constructing three-dimensional solid bodies from point cloud data and calculating Minkowski Functionals. Through test cases comparing voxelization and alpha shapes, as well as analysis of pasta structures obtained through classical molecular dynamics, we demonstrate that the alpha shapes method provides more accurate geometric representations and simplifies the calculation of Minkowski Functionals. We use Diode, a Python library implementing alpha shape calculations, to verify previously observed correlations between pasta shapes and their position in the Curvature-Euler Characteristic plane. Our analysis, extending across various temperatures and densities, reveals a density-dependent trend in pasta shapes that is relatively temperature-independent. The method is also tested satisfactorily with neutron star matter. These findings provide a quantitative framework for characterizing the evolution of nuclear pasta structures and offer a new computational tool for researchers studying these phenomena through different theoretical approaches.
在亚饱和密度和接近零温度的大型核子系统中出现的核面食结构，传统上使用闵可夫斯基泛函进行分析，特别是通过曲率和欧拉特性之间的相关性。以前的方法依靠立方体素化从核理论数据点创建三维物体，导致对几何性质的不准确估计。这项工作介绍了alpha形状方法作为从点云数据构建三维实体和计算闵可夫斯基泛函的优越选择。通过体素化和alpha形状的对比测试用例，以及对经典分子动力学得到的面食结构的分析，我们证明了alpha形状方法提供了更精确的几何表示，简化了Minkowski泛函的计算。我们使用二极管，一个实现alpha形状计算的Python库，来验证之前观察到的面食形状和它们在曲率-欧拉特征平面上的位置之间的相关性。我们的分析跨越了不同的温度和密度，揭示了意大利面形状的密度依赖趋势，而这种趋势与温度相对无关。该方法在中子星物质中也得到了满意的验证。这些发现为表征核面食结构的演变提供了定量框架，并为研究人员通过不同的理论方法研究这些现象提供了新的计算工具。
引用次数: 0
An impact of parton distribution functions on open heavy flavour azimuthal angular correlations in Pb-Pb collisions at sNN = 5.5 TeV
sNN = 5.5 TeV下Pb-Pb碰撞中部分子分布函数对开放重味方角相关的影响
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-18
DOI: 10.1016/j.nuclphysa.2025.123220
In this paper, we investigate the impact of modern free parton distribution functions and nuclear parton distribution functions on the azimuthal angular correlation of open heavy flavour hadrons in Pb–Pb collisions at = 5.5 TeV using PYTHIA8 + Angantyr model. The method involves a transverse momentum () differential assessment of azimuthal angular correlations between prompt and . By analysing the -dependent behaviour of these correlations, we probe the interplay between different production mechanisms and assess the impact of parton distribution functions on heavy flavour hadron production dynamics. Our results indicate that nuclear parton distribution functions significantly modify the azimuthal correlation distribution's near-side and away-side peaks compared to the default PYTHIA8 baseline, particularly at low . The near-side double-peak structure suggests contributions from next-to-leading order (NLO) processes, such as gluon splitting, and its presence is strongly correlated with the number of hard multi-parton interactions. Additionally, by quantitatively comparing the change in correlation widths across various PDF settings, we comment on the role of nuclear parton distribution functions on the broadening of correlation distribution in heavy-ion collisions. This comprehensive study of azimuthal correlations enhances our understanding of nuclear collisions's initial-state conditions and heavy flavour production dynamics.
本文利用PYTHIA8 + Angantyr模型研究了sNN = 5.5 TeV下Pb-Pb碰撞中现代自由部分子分布函数和核部分子分布函数对开放重味强子方位角相关的影响。该方法涉及对提示符D0−D¯0和提示符B−B¯之间的方位角相关性进行横向动量（pT）微分评估。通过分析这些相关性的pt依赖行为，我们探索了不同生产机制之间的相互作用，并评估了部分子分布函数对重味强子生产动力学的影响。我们的研究结果表明，与默认的PYTHIA8基线相比，核部分子分布函数显著地改变了方位角相关分布的近侧和远侧峰，特别是在低pT时。近侧双峰结构表明，胶子分裂等次优序（NLO）过程对其有贡献，并且它的存在与硬多部分子相互作用的数量密切相关。此外，通过定量比较不同PDF设置下相关宽度的变化，我们评论了重离子碰撞中核部分子分布函数对D0−D¯0相关分布展宽的作用。这种方位相关性的综合研究增强了我们对核碰撞初始状态条件和重味产生动力学的理解。
引用次数: 0
Isospin dependence of shell closure at N = 90 and 92 for medium mass nuclei using relativistic energy density functional
利用相对论能量密度泛函研究中等质量原子核在N = 90和92时壳层闭合的同位旋依赖性
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-18
DOI: 10.1016/j.nuclphysa.2025.123222
In a recent study [Europhys. Lett. 146, (2024), 14001], a novel relativistic parameterisation of the energy density functional (EDF) at local density was integrated into the coherent density fluctuation model (CDFM). This approach employed the density-dependent DD-ME2 parameter within the relativistic Hartree-Bogoliubov framework, alongside the well-established non-linear NL3 force parameter, to investigate the surface properties of a few doubly-magic nuclei. In the present work, we extend this new relativistic EDF formulation to a much broader region: the evolution of shell structure across several open- and closed-shell nuclei of intermediate-mass isotopic chains, specifically Kr (), Sr (), Te (), Xe (), Ba (), Ce (), Nd () and Sm (). Using the CDFM formalism, we translate key nuclear matter quantities, such as the symmetry energy and its derivatives, from momentum space to coordinate space at local densities. This procedure is particularly relevant when investigating nuclei near the drip lines. Our findings demonstrate that the symmetry energy successfully reproduces the conventional magic numbers and 82 while indicating the emergence of new shell and/or sub-shell closures around and 92. Furthermore, we decompose the symmetry energy into its volume and surface components, using two approaches, and perform an extensive comparison to assess their impact on the identification of shell closures. We also examine how neutron-proton asymmetry influences the symmetry energy along these isotopic chains. In general, this study highlights novel regions of interest in the medium-mass region of the nuclear chart. It emphasises the need for experimental investigations of the newly suggested shell closures.
在最近的一项研究中[欧洲物理学]。leet . 146,(2024), 14001]，将局部密度下能量密度泛函（EDF）的一种新的相对论参数化集成到相干密度涨落模型（CDFM）中。该方法采用了相对论Hartree-Bogoliubov框架中密度相关的DD-ME2参数，以及已建立的非线性NL3力参数，来研究一些双魔核的表面性质。在目前的工作中，我们将这个新的相对论EDF公式扩展到更广泛的区域：跨几个中等质量同位素链的开壳核和闭壳核的壳结构演化，特别是Kr （Z=36）、Sr （Z=38）、Te （Z=52）、Xe （Z=54）、Ba （Z=56）、Ce （Z=58）、Nd （Z=60）和Sm （Z=62）。利用CDFM的形式，我们将关键的核物质量，如对称能量及其导数，从动量空间转换到局部密度下的坐标空间。当研究滴注管附近的核时，这种方法尤其适用。我们的研究结果表明，对称能成功地再现了传统的幻数N=50和82，同时表明在N=90和92附近出现了新的壳和/或子壳闭包。此外，我们使用两种方法将对称能分解为其体积和表面分量，并进行了广泛的比较，以评估它们对壳包体识别的影响。我们还研究了中子-质子不对称如何影响这些同位素链上的对称能。总的来说，这项研究突出了核图中质区感兴趣的新区域。它强调需要对新建议的封壳进行实验调查。
引用次数: 0
Phenomenological studies for α-decay process within position-dependent effective mass
位置相关有效质量内α-衰变过程的现象学研究
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-18
DOI: 10.1016/j.nuclphysa.2025.123223
In this work, we present a new phenomenological study of the favored and unfavored α-decay process within the framework of position-dependent effective mass (PDEM) and the WKB approximation. Our approach integrates the quantum concept of PDEM into a simplified model while explicitly incorporating the centrifugal barrier effect, which arises from the transfer of angular momentum of the emitted particle. This contribution is essential for analyzing even-odd, odd-even and odd-odd nuclei. By deriving the deformed Schrödinger equation with this additional term, we refine the expression for the α-decay half-life. The proposed formula has been tested on 397 nuclei, classified into four configurations: even-even, even-odd, odd-even, and odd-odd. The results show excellent agreement with experimental data across all cases. Furthermore, we emphasize that the deformation parameter β, introduced through the PDEM framework, is not merely an adjustable fitting parameter but is intrinsically linked to the underlying structure of the model.
在这项工作中，我们在位置相关有效质量（PDEM）和WKB近似的框架下，对有利和不利α-衰变过程进行了新的现象学研究。我们的方法将PDEM的量子概念整合到一个简化的模型中，同时明确地纳入了离心势垒效应，这是由发射粒子的角动量转移引起的。这一贡献对于分析奇偶核、奇偶核和奇偶核是必不可少的。通过推导带有这一附加项的变形Schrödinger方程，我们改进了α衰变半衰期的表达式。所提出的公式已经在397个核上进行了测试，这些核被分为四种构型：偶偶、偶奇、奇偶和奇奇。结果表明，在所有情况下，与实验数据非常吻合。此外，我们强调，通过PDEM框架引入的变形参数β不仅仅是一个可调的拟合参数，而且与模型的底层结构有着内在的联系。
引用次数: 0
Twist-2 distribution amplitudes of a0(980) and a0(1450)
a0（980）和a0（1450）的Twist-2分布振幅
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-14
DOI: 10.1016/j.nuclphysa.2025.123219
We investigate the twist-2 distribution amplitudes of the scalar mesons and in the two-quark picture. The moments of these scalar mesons are obtained up to the third order with QCD sum rules method. With these moments, the first two Gegenbauer coefficients are determined and utilized to analyze the twist-2 distribution amplitudes. Our numerical results indicate that the meson favors a conventional two-quark ground state. The paper concludes with an examination of the form factors for the transitions .
我们研究了双夸克图像中标量介子a0（980）和a0（1450）的扭转-2分布振幅。用QCD和规则方法得到了三阶标量介子的矩量。利用这些力矩，确定了前两个Gegenbauer系数，并利用它们来分析扭转-2分布幅度。我们的数值结果表明介子a0（980）倾向于传统的双夸克基态。最后，本文对B/D→a0跃迁的形状因子进行了检验。
引用次数: 0
Analytical study of conformable fractional bohr hamiltonian with the extended form of the sextic potential
可调分数玻尔哈密顿算子的解析研究
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-12
DOI: 10.1016/j.nuclphysa.2025.123221
New analytical solutions of the conformable fractional Bohr Hamiltonian for triaxial nuclei have been derived, incorporating an extended form of the Sextic potential in the component of the collective nuclear potential, alongside a steep harmonic oscillator in the component. This particular type of potential can specifically recover sextic, Davidson and harmonic potentials in particular cases. The energy spectra and corresponding wave functions are analytically determined through a novel conformable fractional extended Nikiforov-Uvarov method. Additionally, the derivation of the wave functions necessitates the application of the bi-confluent Heun functions. This study examines the relationship between the conformable fractional spectra of the potential and the benchmark spectrum. A systematic analysis is conducted to explore the spectral expansion as a function of both the fractional derivative order and the potential parameters. The normalized transition rates and corresponding energy spectra were computed and systematically compared with experimental measurements. The theoretical predictions demonstrate excellent agreement with empirical data across multiple isotopic chains, including 112,114,116Pd, 120, 126, 128, 130, 132, 134Xe, and 192,194,196Pt.
推导出了三轴核的符合分数玻尔哈密顿量的新解析解，在集体核势的β分量中加入了六次方势的扩展形式，在γ分量中加入了陡谐振子。这种特殊类型的电位可以在特定情况下恢复六次、戴维森和谐波电位。通过一种新颖的符合分数阶扩展Nikiforov-Uvarov方法解析确定了能量谱和相应的波函数。此外，波函数的推导需要应用双合流Heun函数。本研究考察了电位的符合分数谱与Z(5)基准谱之间的关系。系统地分析了谱展开作为分数阶导数阶数和势参数的函数。计算了归一化后的B（E2）跃迁速率和能谱，并与实验结果进行了系统比较。理论预测与多个同位素链（包括112,114,116Pd, 120, 126, 128, 130, 132, 134Xe和192,194,196Pt）的经验数据非常吻合。
引用次数: 0
An examination of the two-peak hypothesis of PΨsΛ(4459) using heavy quark symmetries
用重夸克对称对PΨsΛ（4459）双峰假说的检验
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-06
DOI: 10.1016/j.nuclphysa.2025.123218
The LHCb Collaboration announcement regarding the observation of the stated that it might consist of two resonances rather than a single one. Naturally, the structure and composition of state has prompted significant interest among researchers. Within the framework of generalized flavor-spin symmetry, the has been correlated with the previously identified as one-peak states , which were later found to be two-peak, and . We investigate whether the embodies one or two distinct resonances. Notably, one of the predicted peaks posited by LHCb analysis appears to correspond to a molecular state.
关于观测到PΨsΛ（4459）的LHCb合作公告指出，它可能由两个共振而不是一个共振组成。自然，PΨsΛ（4459）态的结构和组成引起了研究人员的极大兴趣。在广义风味-自旋对称的框架内，PΨsΛ（4459）与之前确定的单峰态Pc（4450）相关，后来发现是双峰态Pcc¯（4440）和Pcc¯（4457）。我们调查是否PΨsΛ（4459）体现一个或两个不同的共振。值得注意的是，LHCb分析假设的一个预测峰似乎对应于D¯Ξc分子状态。
引用次数: 0
Quantifying uncertainties in α-nucleus reaction dynamics informed from first principles
从第一性原理出发，量化α-核反应动力学中的不确定性
IF 2.5
4区 物理与天体物理
Q2 PHYSICS, NUCLEAR
Pub Date : 2025-08-05
DOI: 10.1016/j.nuclphysa.2025.123203
The ab initio symmetry-adapted no-core shell model is a microscopic many-body method which naturally describes challenging collective and clustering features of atomic nuclei. Wave functions and observables computed with realistic nucleon-nucleon forces in this framework are tied to first principles, and are hence well-suited for rigorous uncertainty quantification. We discuss α-deuteron and α-12C cluster potentials informed by symmetry-adapted calculations, and propagate uncertainties in the effective binary cluster method as well as those in the nuclear interaction to reaction observables, namely scattering phase shifts, cross sections, partial widths and resonance energies. We find that the overall uncertainties are dominated by those originating in the underlying nuclear force, speaking to the need for tighter constraints on realistic nucleon-nucleon interactions.
从头算适应对称的无核壳模型是一种微观多体方法，它自然地描述了原子核具有挑战性的集体和聚类特征。在这个框架中，用实际的核子-核子力计算的波函数和观测值与第一性原理相联系，因此非常适合严格的不确定性量化。我们讨论了α-氘核和α-12C星团势的对称性计算，并将有效二元星团方法中的不确定性以及核相互作用中的不确定性传播到反应观测值，即散射相移、横截面、部分宽度和共振能。我们发现，总的不确定性是由那些源自潜在核力的不确定性主导的，这说明需要对现实的核子-核子相互作用进行更严格的约束。
引用次数: 0
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