Nuclear Physics A最新文献

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Systematics of electric dipole excitations in rare-earth 146−156Sm nuclei 稀土146 ~ 156Sm核中电偶极激发的系统论

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-29 DOI: 10.1016/j.nuclphysa.2025.123305

E. Guliyev , H. Quliyev , A.A. Kuliev , A. Jalili

The electric dipole responses of the even-even ^146–156Sm nuclei were studied using translational and Galilean invariant (TGI-) quasi-particle random-phase approximation (QRPA), with the highly fragmented E1 strength being predicted. By comparing these calculations with experimental data for the photon absorption cross section σ_γ, it was shown that the QRPA model can reproduce the shape of the GDR quite well. The excitation energies, transition probabilities, and splitting behaviors of the PDR into K = 0 and K=±1 branches and other properties were also investigated further. Calculations on one-phonon wave functions confirmed that the dipole states below the particle threshold energy have characteristics that are different from those exhibited by the giant dipole resonance. Using this difference, we thereby determined the character of the experimentally observed dipole excitations around 10 MeV and showed that the PDR can reach the 10 MeV region. For the first time, PDR and GDR calculations were performed specifically for the ¹⁴⁶Sm and ¹⁵⁶Sm isotopes, providing new insights into their dipole response characteristics.

利用平移和伽利略不变（TGI-）准粒子随机相位近似（QRPA）研究了偶偶146-156Sm核的电偶极子响应，并预测了高碎片化的E1强度。将这些计算结果与光子吸收截面σγ的实验数据进行比较，表明QRPA模型能较好地再现GDR的形状。进一步研究了PDR的激发能、跃迁概率、K= 0和K=±1分支的分裂行为以及其他性质。单声子波函数的计算证实，低于粒子阈值能量的偶极子态具有不同于巨偶极子共振所表现出的特征。利用这一差异，我们由此确定了实验观测到的偶极激发在10 MeV附近的特征，并表明PDR可以达到10 MeV区域。首次对146Sm和156Sm同位素进行了PDR和GDR计算，为其偶极子响应特性提供了新的见解。

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引用次数: 0

Effect of collective enhancement of level density in the neutron emission from compound nuclei 复合核中子发射中能级密度的集体增强效应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-27 DOI: 10.1016/j.nuclphysa.2025.123289

B. Sidharth, M. Shareef

A systematic analysis of pre-scission neutron multiplicities are performed using a statistical model for the reactions ¹⁸O+¹⁵⁰Sm, ¹⁹F+¹⁶⁹Tm, ¹⁶O+¹⁹⁴Pt, and ¹⁹F+²⁰⁹Bi populating the compound nuclei ¹⁶⁸Yb, ¹⁸⁸Pt, ²¹⁰Rn, and ²²⁸U. This analysis incorporates Krammer’s fission width due to the dissipative drag in nuclear fission, shell corrections in fission barrier and level density, collective enhancement of level density in fission and particle emission widths. The present work demonstrates that a strong fission hindrance in terms of temperature-independent dissipation coefficient is essential to reproduce the experimental pre-scission neutrons for heavy-mass systems. A significant effect of CELD was observed on the neutron emission probability for nuclei which is spherical in its ground state.

利用统计模型系统分析了填入168Yb、188Pt、210Rn和228U复合核的18O+150Sm、19F+169Tm、16O+194Pt和19F+209Bi反应的裂变前中子多重度。该分析综合了核裂变中耗散阻力引起的Krammer裂变宽度、裂变势垒和能级密度中的壳层修正、裂变中能级密度的集体增强以及粒子发射宽度。本研究表明，在重质量系统中，要重现实验前裂变中子，就温度无关耗散系数而言，一个强大的裂变阻碍是必不可少的。对于基态为球形的原子核，CELD对其中子发射概率有显著影响。

引用次数: 0

Isospin dependence of the nuclear temperature in the reactions 78Kr+40Ca and 86Kr+48Ca at 10 AMeV 10amev下78Kr+40Ca和86Kr+48Ca反应核温度的同位旋依赖性

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-26 DOI: 10.1016/j.nuclphysa.2025.123292

Brunilde Gnoffo , Sara Pirrone , Giuseppe Politi , Enrico De Filippo , Giuseppe Cardella , Elena Geraci , Concettina Maiolino , Nunzia Simona Martorana , Angelo Pagano , Emanuele Vincenzo Pagano , Massimo Papa , Fabio Risitano , Francesca Rizzo , Paolo Russotto , Marina Trimarchi , Cristina Zagami

The isospin dependence of temperatures is investigated in the reactions ⁷⁸Kr+⁴⁰Ca and ⁸⁶Kr+⁴⁸Ca at 10 AMeV. These reactions were studied in the context of the ISODEC experiment, performed at INFN-Laboratori Nazionali del Sud in Catania, by using the 4π multidetector CHIMERA. The results of the data analysis suggest that the temperature depends on the N/Z ratio. Different thermometric methods,as well as the slope and fluctuations thermometer with the alpha particles as probe and the double isotope yields ratio thermometer are used to extract the temperature of compound nucleus. Higher values of the temperature were observed for the neutron rich system compared to neutron poor one. This trend is confirmed by the comparison with the GEMINI++ statistical model.

研究了78Kr+40Ca和86Kr+48Ca在10 AMeV下的同位旋对温度的依赖性。这些反应在ISODEC实验的背景下进行了研究，在卡塔尼亚的infn - Nazionali del Sud实验室，使用4π多探测器CHIMERA。数据分析结果表明，温度与N/Z比有关。采用了不同的测温方法，以及以α粒子为探针的斜率波动温度计和双同位素产率比温度计来提取复合核的温度。富中子体系的温度高于贫中子体系。与GEMINI++统计模型的比较证实了这一趋势。

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引用次数: 0

Nuclear shape transition of Th isotope at fission limits: a fourier shape parametrization approach 裂变极限处Th同位素的核形状跃迁：傅里叶形状参数化方法

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-24 DOI: 10.1016/j.nuclphysa.2025.123291

K. Jyothish, M.R. Asmitha, Rhine A.K. Kumar

The deformation energy landscape of ²³²Th nucleus along its fission path is investigated using the Lublin-Strasbourg Drop (LSD) model with the Fourier shape parametrization. The nuclear surface is represented by a truncated Fourier series in terms of collective coordinates associated with elongation (q₂), mass asymmetry (q₃), and neck formation (q₄). This parametrization offers enhanced flexibility in describing fission pathways and the complex shape transitions of the thorium isotope up to the scission point. Studying fission characteristics in actinide nuclei such as ²³²Th is crucial to advance our understanding of nuclear energy production and structure.

利用具有傅里叶形状参数化的卢布林-斯特拉斯堡滴（LSD）模型研究了232Th核沿裂变路径的变形能场。核表面由截断的傅立叶级数表示，其集体坐标与延伸率（q2）、质量不对称（q3）和颈部形成（q4）相关。这种参数化在描述裂变路径和钍同位素到裂变点的复杂形状转变方面提供了增强的灵活性。研究像232Th这样的锕系原子核的裂变特性对于提高我们对核能产生和结构的理解至关重要。

引用次数: 0

Investigating entrance channel effect through the measurement of neutron multiplicity in mass region a  ≈ 200 通过测量质量区a ≈ 200的中子多重率来研究入口通道效应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-22 DOI: 10.1016/j.nuclphysa.2025.123271

Neha Dhanda , Ashok Kumar , Chetan Sharma , Amninderjeet Kaur , Basant Sura , Komal , Amit , Kiran , B.R. Behera , P. Sugathan , Akhil Jhinghan , N. Saneesh , K.S. Golda , Mohit Kumar , Rishabh Parjapati , Avitesh Agrawal , Ishika Sharma , H.P. Sharma , S.K. Chamoli , Swapna Balkrishna , Lakhyajit Sarma

In this study, we measured both the pre-scission and post-scission neutron multiplicities for the ³¹P + ¹⁷⁰Er reaction at excitation energies in the range of 62-84 MeV, using the National Array of Neutron Detectors (NAND) at Inter University Accelerator Centre (IUAC), New Delhi. Theoretical calculations to reproduce the measured neutron multiplicities have been performed using the dynamical model code VECLAN. These calculations show that the dissipation strength parameter (β) increases with excitation energy. Dynamical model calculations also have been performed using HICOL code to understand the fusion dynamics and formation time. It has been observed that transitioning from an asymmetric to a symmetric entrance channel leads to a gradual increase in the compound nucleus formation time, accompanied by more emission of neutrons during its formation.

在这项研究中，我们使用位于新德里大学加速器中心（IUAC）的国家中子探测器阵列（NAND）测量了激发能在62-84 MeV范围内的31P + 170Er反应的裂变前和裂变后中子多重率。用动力学模型代码VECLAN进行了理论计算，再现了测量到的中子多重度。这些计算表明，耗散强度参数（β）随激发能量的增加而增加。利用HICOL代码进行了动力学模型计算，以了解融合动力学和形成时间。从非对称入口通道到对称入口通道的转变导致复合核形成时间逐渐增加，并且在形成过程中伴随有更多的中子发射。

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引用次数: 0

The role of the screening potential in the deuteron-deuteron thermonuclear reaction rates 筛选电位在氘核-氘核热核反应速率中的作用

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-20 DOI: 10.1016/j.nuclphysa.2025.123287

Faisal Etminan

The deuteron-deuteron (D-D) thermonuclear reaction rates in metallic environments, accounting for electron screening effects, are calculated using S-factor functions derived from fits to low-energy D-D reaction data. For this purpose, a fitted S-factor model based on the NACRE compilation is employed, which constrains the energy range applicable to Big Bang nucleosynthesis (BBN) for the ²H(d, p)³H and ²H(d, n)³He reactions. The Maxwellian-averaged thermonuclear reaction rates, relevant to astrophysical plasmas at temperatures ranging from 10⁶ K to 10¹⁰ K (or 1.3 × 10⁸ K), are presented in tabular formats. The effects of electron screening are phenomenologically analyzed, with screening energy (U_e) values of 100, 400, 750, 1000, and 1250 eV being employed for this purpose. This selection of values is grounded in theoretical and experimental studies conducted to date. Ultimately, the numerical analysis reveals that the ratio of the screened reaction rate to the unscreened reaction rate can be expressed by the numerical formula

\exp (4.70 + 6.50 \times 10^{- 6} U_{e} / T_{9})

for both the ²H(d, p)³H and ²H(d, n)³He reactions.

考虑电子屏蔽效应的金属环境中的氘核-氘核（D-D）热核反应速率，使用从低能D-D反应数据拟合得来的s因子函数计算。为此，我们采用了一个基于naacre汇编的拟合s因子模型，该模型限制了2H(d, p)3H和2H(d, n)3He反应适用于大爆炸核合成（BBN）的能量范围。在106 K到1010 K（或1.3 × 108 K）温度范围内与天体物理等离子体相关的麦克斯韦平均热核反应速率以表格形式呈现。采用100、400、750、1000和1250 eV的筛选能（Ue）值对电子筛选的效果进行了现象学分析。这种值的选择是基于迄今为止进行的理论和实验研究。最后，数值分析表明，对于2H(d, p)3H和2H(d, n)3He反应，筛选反应速率与未筛选反应速率之比可以用数值公式exp（4.70+6.50×10−6Ue/T9）表示。

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引用次数: 0

Nuclear structure of medium and heavy mass nuclei: From collectivity trends to machine learning approaches 中质量和重质量核的核结构：从集体趋势到机器学习方法

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-20 DOI: 10.1016/j.nuclphysa.2025.123288

Mudasir Ahmad, Amit Bindra

Quantum shape-phase transitions in medium and heavy mass nuclei remain key benchmarks for testing nuclear models. Building on recent machine learning (ML) studies [1–3], we introduce a hybrid framework that integrates empirical systematics, Interacting Boson Approximation (IBA-1), and Light Gradient Boosting Machine (LightGBM) predictions. A composite sensitivity parameter, S = ▾R_4/2 × B(E2; 0⁺ → 2⁺) is proposed, coupling deformation dynamics with quadrupole collectivity. Applied to rare-earth nuclei (Z = 58–68, N = 84–102) Ȿ exhibits a sharp peak near N ∼ 90, providing a distinct indicator of the U(5)–SU(3) phase transition. LightGBM reproduces excitation energies and B(E2) values with high accuracy across 47 isotopes, while extrapolations identify ¹⁵⁴Gd and ¹⁵⁶Dy as critical-point candidates and highlight ¹⁵⁶Nd, ¹⁵⁰Gd and ^152,168Dy as priority cases for measurement. The reliability of our approach is underscored by SHAP (Shapley additive explanation) analysis, which highlights the dominant role of the Casten factor and neutron number, thereby reinforcing the physical interpretability of the model. These findings establish Ȿ as a sensitive probe of shape evolution and demonstrate the promise of physics-guided ML–theory frameworks for informing future spectroscopic studies. Our methodology is inherently scalable and can be systematically extended across the nuclear chart to explore shape coexistence and shell evolution, offering a robust pathway for future ML–IBA studies in diverse structural regimes.

中、重质量核的量子形态相变仍然是检验核模型的关键基准。基于最近的机器学习（ML）研究[1-3]，我们引入了一个混合框架，该框架集成了经验系统学、相互作用玻色子近似（IBA-1）和光梯度增强机（LightGBM）预测。提出了一种复合灵敏度参数S =→R4/2 × B(E2; 0 +→2 +)，耦合变形动力学与四极集体。应用于稀土核（Z = 58 ~ 68, N = 84 ~ 102）Ȿ，在N ~ 90附近有一个尖峰，为U(5) -SU(3)相变提供了一个明显的指示。LightGBM高精度地再现了47种同位素的激发能和B（E2）值，而外推法将154Gd和156Dy确定为临界点候选者，并突出156Nd， 150Gd和152168dy作为优先测量案例。SHAP （Shapley加性解释）分析强调了我们方法的可靠性，该分析强调了Casten因子和中子数的主导作用，从而加强了模型的物理可解释性。这些发现确立了Ȿ作为形状演变的敏感探针，并展示了物理指导的ml理论框架为未来的光谱研究提供信息的前景。我们的方法具有固有的可扩展性，可以系统地扩展到整个核图中，以探索形状共存和壳演化，为未来在不同结构制度下的ML-IBA研究提供了强有力的途径。

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引用次数: 0

Production of 57Co and 51Cr isotopes for medical application in the interaction of 16O projectile with 45Sc target -生产用于医用16O弹与45Sc靶相互作用的57Co和51Cr同位素

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-19 DOI: 10.1016/j.nuclphysa.2025.123285

Dharmendra Singh , Amritraj Mahato , Nitin Sharma , Rajesh K. Sahoo , Rahul Mahato , Lupteindu Chhura , Mohd. Usman , Rahbar Ali , M. Afzal Ansari , M. Ismail

Excitation functions for the ¹⁶O + ⁴⁵Sc reaction were measured over 39.2-114.5 MeV, focusing on the production of medically important radioisotopes ⁵⁷Co and ⁵¹Cr. ⁵⁷Co (half-life: 271.8 days) is a γ-emitter widely used in medical imaging, and Mössbauer spectroscopy, while ⁵¹Cr (half-life: 27.7 days) is employed in blood volume and glomerular filtration rate assessment. In the present work, stacked foil technique was employed followed by offline γ-ray spectroscopy. The measured excitation functions for ⁵⁷Co and ⁵¹Cr were compared with the predictions from the statistical model code PACE4. The experimental cross-sections of these radioisotopes were found to be significantly higher than the PACE4 predictions. These enhancements are attributed to the contribution of incomplete fusion processes which are not accounted in PACE4, highlighting an alternative pathway for radioisotope production via complete and incomplete fusion mechanisms at above barrier energies. While, the cross-section yields for both the radioisotopes were found to be high, the results indicate that the ¹⁶O+⁴⁵Sc reaction is more suitable for ⁵¹Cr production due to its cleaner excitation function.

在39.2-114.5 MeV范围内测量了16O + 45Sc反应的激发函数，重点关注了医学上重要的放射性同位素57Co和51Cr的产生。57Co（半衰期：271.8天）是γ-发射体，广泛用于医学成像和Mössbauer光谱，而51Cr（半衰期：27.7天）用于血容量和肾小球滤过率评估。在本工作中，采用叠箔技术，然后采用离线γ射线能谱法。将57Co和51Cr的实测激发函数与统计模型代码PACE4的预测结果进行了比较。这些放射性同位素的实验截面被发现明显高于PACE4的预测。这些增强归因于PACE4中未考虑的不完全聚变过程的贡献，强调了在上述势垒能下通过完全和不完全聚变机制产生放射性同位素的另一种途径。虽然这两种放射性同位素的截面产率都很高，但结果表明，16O+45Sc反应更适合生成51Cr，因为它的激发函数更清晰。

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引用次数: 0

Cross sections for 184,186Re radioisotopes for medical applications: A proton-induced approach 医用184,186Re放射性同位素的截面：质子诱导方法

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-18 DOI: 10.1016/j.nuclphysa.2025.123284

S. Hinge, P. Singh, K. Churi, M. Hemalatha

The study presents calculated cross sections for proton-induced reactions on ^{180,182,183,184,186}W isotopes for the production of ^{180,182,183,184,186}Re using the TALYS-2.0 nuclear reaction code. The optical model potentials were calculated using Koning-Delaroche (KD) model for protons scattering from ^{180,182,183,184,186}W isotopes. Using the potentials, the calculated differential elastic scattering and total reaction cross sections were compared with corresponding data where available and were found to be in good agreement. Further, the calculated (p,n) reaction cross sections were calculated using nuclear level densities from both the back-shifted Fermi gas model (BFM) and the microscopic Hartree-Fock-Bogoliubov (HFB) approaches. The calculated (p,n) reaction cross sections compare well with data and TENDL-2023 for ¹⁸⁶Re for which data are available, while for the isotopes, ^180,182,183Re, predictions have been made. In addition, production yields have been calculated for the medically relevant radionuclides, ^184,186Re.

本研究利用TALYS-2.0核反应代码计算了180,182,183,184,186W同位素上质子诱导反应产生180,182,183,184,186Re的截面。利用Koning-Delaroche （KD）模型计算了180,182,183,184,186W同位素的质子散射光学模型电位。利用这些势，将计算得到的微分弹性散射和总反应截面与相应的数据进行了比较，发现两者吻合得很好。此外，利用后移费米气体模型（BFM）和微观hartri - fock - bogoliubov （HFB）方法计算了计算得到的（p,n）反应截面。计算得到的（p,n）反应截面与已有数据的186Re的数据和TENDL-2023比较良好，而对同位素180,182,183Re进行了预测。此外，还计算了与医学有关的放射性核素184,186Re的产量。

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引用次数: 0

Effect of different density distributions and one-dimensional potential barrier for 15C + 12C fusion reactions at astrophysical energies 不同密度分布和一维势垒对天体物理能量下15C + 12C聚变反应的影响

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-11-15 DOI: 10.1016/j.nuclphysa.2025.123283

Halil Basaran , Gokhan Kocak , Murat Aygun

The fusion cross-sections of the ¹⁵C + ¹²C reaction are analyzed using the optical model at energies around the Coulomb barrier. For this objective, the present study consists of two parts. First, three different density distributions of the nucleus ¹⁵C are applied to produce the real potential of the double-folding model. Then, the fusion cross-sections are investigated using a one-dimensional potential barrier approximation at astrophysical energies with Morse-type and harmonic-oscillator potentials to make a comprehensive analysis. The theoretical results are in good agreement with the experimental data. We have concluded that the Gaussian-based density distributions are important tools for fusion cross-section calculations with neutron-rich nuclei.

用光学模型分析了15C + 12C反应在库仑势垒附近的聚变截面。为此，本研究分为两部分。首先，应用原子核15C的三种不同密度分布来产生双折叠模型的真实势能。在此基础上，利用天体物理能量下具有莫尔斯型和谐振子势垒的一维势垒近似研究了聚变截面，并进行了综合分析。理论结果与实验数据吻合较好。我们已经得出结论，高斯密度分布是计算富中子核聚变截面的重要工具。

引用次数: 0

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