Nuclear Physics A最新文献

英文中文

A comprehensive activation analysis of fusion-fission cross-sections for 14N +175Lu system 14N +175Lu体系聚变-裂变截面的综合活化分析

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-24 DOI: 10.1016/j.nuclphysa.2026.123341

Satyendra Kumar Gautam , Manoj Kumar Sharma , Sushant Arora , Mamta Sarswat , Aquib Siddique , M. Shariq Asnain , Mohd. Shuaib , Ishfaq Majeed , Abhishek Yadav , Puspendra P. Singh , B.P. Singh , R. Prasad

The experiments for measuring the cross sections of 35 fission-like residues (with mass numbers 74  ≤  A  ≤  111) and 10 fusion-like residues have been carried out at energies  ≈  72.7 MeV, 80.3 MeV and 88.0 MeV. In this measurement, the recoil catcher technique followed by an off-beam activation γ-ray spectroscopy is used. The analysis of fusion cross-section data with code PACE4 reveals the contribution of complete and incomplete fusion processes in ¹⁴N +¹⁷⁵Lu reactions. Fission fragments produced as a result of fusion of ¹⁴N projectile with ¹⁷⁵Lu target have also been confirmed by comparing the values of post-fission observables viz., mass (σ_A) and charge (σ_Z) dispersions (deduced from the isotopic mass and isobaric yield distributions) with literature data. In addition to this, the statistical scission-point model based theoretical calculations performed (as per the prescription of Gubbi et. al., [31]) for determining the charge dispersion (σ_Z) of Br and Kr isotopes validate the experimental values of σ_Z obtained from the isobaric yield distribution. Thus, the consistency between theoretical and experimental values of charge dispersion (σ_Z) indicates the production of fission fragments from a equilibrated compound nucleus ¹⁸⁹Pt* in ¹⁴N +¹⁷⁵Lu reactions. In the present work, an alternative method is used for converting isotopic mass distribution into isobaric yield distribution. Furthermore, the experimental finding of mass variance (

σ_{M}^{2}

) of fission fragments also complements the investigations of mass (σ_A) and charge (σ_Z) dispersions, as width of mass distribution (i.e., mass variance,

σ_{M}^{2}

) of fission fragments is found to be exponentially function of excitation energy, hence, temperature of equilibrated compound nucleus.

实验测量了35个质量数为74 ≤ A ≤ 111的类裂变残基和10个能量为 ≈ 72.7 MeV、80.3 MeV和88.0 MeV的类聚变残基的截面。在这个测量中，后坐力捕捉技术随后的离束激活γ射线光谱被使用。用PACE4代码对核聚变截面数据进行分析，揭示了完全核聚变和不完全核聚变对14N +175Lu反应的贡献。通过将裂变后的质量（σA）和电荷（σZ）色散值（由同位素质量和等压产率分布推导而来）与文献数据进行比较，证实了14N弹丸与175Lu靶融合产生的裂变碎片。此外，基于统计断裂点模型的理论计算（按照Gubbi et al.，[31]的规定）确定了Br和Kr同位素的电荷色散（σZ），验证了从等压产率分布中得到的σZ的实验值。因此，电荷色散（σZ）的理论值与实验值的一致性表明，在14N +175Lu反应中，平衡复合核189Pt*产生了裂变碎片。在本工作中，采用了另一种方法将同位素质量分布转化为等压产率分布。此外，裂变碎片的质量方差（σM2）的实验发现也补充了质量（σA）和电荷（σZ）色散的研究，发现裂变碎片的质量分布宽度（即质量方差，σM2）是激发能的指数函数，因此，平衡复合核的温度。

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引用次数: 0

Investigation of entanglement in N=Z nuclei within no-core shell model 无核壳层模型中N=Z核纠缠的研究

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-21 DOI: 10.1016/j.nuclphysa.2026.123339

Chandan Sarma, Praveen C. Srivastava

In this work, we explore the entanglement structure of two

N = Z

nuclei, ²⁰Ne and ²²Na using single-orbital entanglement entropy within the No-Core Shell Model (NCSM) framework for two realistic interactions, INOY and N³LO. We begin with the determination of the optimal frequencies based on the variation of ground-state (g.s.) binding energy with NCSM parameters, N_max and ℏΩ, followed by an analysis of the total single-orbital entanglement entropy, S_tot, for the g.s. of ²⁰Ne and ²²Na. Our results show that S_tot increases with N_max and decreases with ℏΩ after reaching a maximum. We use S_tot to guide the selection of an additional set of optimal frequencies that can enhance electromagnetic transition strengths. We also calculate the low-energy spectra and S_tot for four low-lying states of ²⁰Ne and six low-lying states of ²²Na. Finally, we calculate a few E2 and one M1 transition strengths, finding that N³LO provides better results for

B (E 2; 5_{1}^{+} \to 3_{1}^{+}

) and INOY performs well for the

B (M 1; 0_{1}^{+} \to 1_{1}^{+})

transition in the ²²Na nucleus while considering the first set of optimal frequencies. We also observe that the second set of optimal frequencies enhances electromagnetic transition strengths, particularly for the states with large and comparable S_tot. Also, for both nuclei, the S_tot for INOY and N³LO are close while considering the second set of optimal frequencies, suggesting that the calculated S_tot are more dependent on ℏΩ than the interactions employed for the same model space defined by the N_max parameter.

在这项工作中，我们利用无核壳层模型（NCSM）框架下的单轨纠缠熵，探索了两个N=Z核，20Ne和22Na的纠缠结构，用于两个现实相互作用，INOY和N3LO。我们首先根据基态结合能随NCSM参数Nmax和λ Ω的变化确定了最佳频率，然后分析了20Ne和22Na的总单轨道纠缠熵Stot。结果表明，Stot随Nmax的增大而增大，达到最大值后随θ Ω的减小而减小。我们使用Stot来指导选择一组可以增强电磁转换强度的额外最佳频率。我们还计算了20Ne的4个低洼态和22Na的6个低洼态的低能谱和Stot。最后，我们计算了几个E2和一个M1跃迁强度，发现在考虑第一组最优频率的情况下，N3LO对B（E2;51+→31+）的跃迁效果较好，而INOY对22Na核中的B（M1;01+→11+）的跃迁效果较好。我们还观察到，第二组最优频率增强了电磁跃迁强度，特别是对于具有较大且可比较的Stot的状态。此外，在考虑第二组最优频率时，对于两个核，INOY和N3LO的Stot接近，这表明计算的Stot更依赖于λ Ω，而不是由Nmax参数定义的相同模型空间所采用的相互作用。

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引用次数: 0

Alpha particle induced compound nuclear reaction cross-sections from sub barrier back angle elastic scattering 粒子诱导的复合核反应亚势垒背角弹性散射截面

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-21 DOI: 10.1016/j.nuclphysa.2026.123340

Sucheta Adhikari , Indrani Bhadra , Chinmay Basu

Sub barrier heavy ion fusion reaction has been studied extensively in relation to back angle elastic and quasi elastic scattering. In this work, this technique is applied to alpha induced reactions with medium heavy nuclei which has relevance to the study of p nuclei synthesis. The elastic alpha scattering cross-sections at 170 degrees on ⁹⁴Mo, ⁹⁰Zr, ¹¹⁰Cd and ¹²⁸Te at below barrier energies are taken as test cases to extract the barrier distributions and the fusion cross-sections for alpha particles. The single Gaussian barrier distribution model which has been recently applied to heavy ion fusion reactions is used in this work for alpha induced reactions and is found to be beneficial in comparison to the multi parameter alpha optical model.

亚势垒重离子聚变反应与后角弹性和准弹性散射的关系得到了广泛的研究。在这项工作中，该技术应用于与p核合成研究相关的中重核α诱导反应。以低于势垒能的94Mo、90Zr、110Cd和128Te在170度处的弹性α散射截面为测试用例，提取了α粒子的势垒分布和聚变截面。本文将最近应用于重离子聚变反应的单高斯势垒分布模型用于α诱导反应，并与多参数α光学模型进行了比较。

引用次数: 0

Heavy tetraquarks in the hyperspherical approach to a four-body system 四体系统超球面方法中的重四夸克

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-18 DOI: 10.1016/j.nuclphysa.2026.123336

F.A. Martynenko, A.V. Eskin, A.P. Martynenko

Within the quark model and hyperspherical method, the bound states of four heavy quarks and antiquarks (tetraquarks) are investigated. In hyperradial approximation, the Schrödinger equation is reduced to a one-dimensional equation after averaging over angles in hyperspace. This equation is solved numerically and analytically within the variational method. The hyperfine structure of the energy spectrum is calculated. To increase the accuracy of the calculation, corrections to the energy levels from the QCD generalization of the Breit Hamiltonian are taken into account.

利用夸克模型和超球方法，研究了四重夸克和反夸克（四夸克）的束缚态。在超径向近似中，Schrödinger方程在超空间中对角度进行平均后简化为一维方程。用变分法对该方程进行了数值求解和解析求解。计算了能谱的超精细结构。为了提高计算的准确性，考虑了从布雷特哈密顿量的QCD推广中对能级的修正。

引用次数: 0

Cutoff independence of the modified Lüscher formula for two-hadron system 双强子系统修正l<s:1> scher公式的截止无关性

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-18 DOI: 10.1016/j.nuclphysa.2026.123337

Jin-Yi Pang, Yuting Wang, Wanchen Lei

We study the ultraviolet regularization of the modified Lüscher formula for two-body systems with long-range interactions and demonstrate that, after imposing a physical renormalization condition, the resulting finite-volume spectrum is independent on the cutoff. The interaction is separated into a known long-range part, taken as a Yukawa potential, and a short-range part parameterized by a polynomial contact expansion, for which we keep the leading S-wave low energy constant (LEC). Although the Yukawa interaction is regular, ultraviolet divergences arise in the infinite volume modified K-matrix and in the finite volume loop function (the modified zeta function H), making a regularization unavoidable. We introduce a smooth form factor

e^{- p^{2} / Λ^{2}}

and determine LEC by fixing the physical S-wave scattering length. With this prescription, the modified K-matrix and finite volume loop function are calculated directly. We find that the modified quantization condition produces the finite volume energy levels correctly near left-hand cut across a wide range of cutoff values. It provides strong evidence that the modified Lüscher formula is a regulator-independent tool for extracting short-range information from lattice spectra in systems with long-range forces.

我们研究了具有远程相互作用的二体系统的修正l scher公式的紫外正则化，并证明了在施加物理重整化条件后，得到的有限体积光谱与截止无关。将相互作用分为已知的远程部分，作为汤川势，以及由多项式接触展开参数化的短程部分，其中我们保留了领先的s波低能量常数（LEC）。虽然Yukawa相互作用是规则的，但在无限体积修正k矩阵和有限体积循环函数（修正zeta函数H）中出现紫外线发散，使得正则化不可避免。我们引入了一个光滑的形状因子e - p2/Λ2，并通过固定物理s波散射长度来确定LEC。利用此公式，直接计算了修正k矩阵和有限体积环函数。我们发现改进的量子化条件在宽范围截止值的左切附近产生了正确的有限体积能级。它提供了强有力的证据，证明改进的l scher公式是一个不依赖于调节器的工具，用于从具有远程力的系统中提取晶格谱的短程信息。

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引用次数: 0

Dynamical aspects of induced α-decay process under X-ray laser field x射线激光场诱导α-衰变过程的动力学方面

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-16 DOI: 10.1016/j.nuclphysa.2026.123335

Shubham Bharmoria , Sukhdeep Kaur , BirBikram Singh , Harjeet Kaur

Laser-induced nuclear phenomena are progressing rapidly with significant advancements in the field of controlled nuclear reactions. This study introduces a novel cross-disciplinary extension of laser-matter interaction theories to nuclear decay processes, opening up possibilities for controlled manipulation of nuclear lifetimes using high-intensity laser environments. We have investigated X-ray laser-assisted α-particle tunneling in even-even and doubly-odd heavy radioactive nuclei using a Floquet-Volkoff (FV) formalism for multiphoton-induced α-decay. This approach is grounded in a microscopic phenomenological framework that incorporates the Skyrme force model of α-nucleus potential within the Wentzel-Kramers-Brillouin (WKB) approximation. Our results demonstrate that emission of the α-particle is influenced by multiphoton absorption to a considerable extent. The nuclei with larger effective charge (Z_eff) and smaller disintegration energies (Q_α-value) are found to be more sensitive to such perturbations. It is found that the logarithmic values of relative enhancement in the penetration probabilities (log₁₀ΔP_rel-values) can be effectively parameterized as a function of Z_eff. Furthermore, the relative enhancement in penetration probability (ΔP_rel) can be directly related to the change in α-decay half-lives i.e. ΔT_rel-values.

激光诱导的核现象发展迅速，在受控核反应领域取得了重大进展。本研究将激光-物质相互作用理论引入到核衰变过程的一个新的跨学科扩展，为利用高强度激光环境控制核寿命开辟了可能性。利用多光子诱导α-衰变的Floquet-Volkoff （FV）形式，研究了x射线激光辅助α-粒子在偶偶和双奇重放射性原子核中的隧穿现象。该方法建立在微观现象学框架的基础上，该框架将α-核势的Skyrme力模型纳入WKB近似。结果表明，α-粒子的发射在很大程度上受多光子吸收的影响。有效电荷（Zeff）较大、衰变能（q α-值）较小的原子核对这种扰动更为敏感。发现穿透概率（log10ΔPrel-values）中相对增强的对数值可以有效地参数化为Zeff的函数。穿透概率（ΔPrel）的相对增强与α-衰变半衰期（ΔTrel-values）的变化有直接关系。

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引用次数: 0

Impact of isospin asymmetric nuclear medium on pseudoscalar and vector B mesons 同位旋不对称核介质对伪标量和矢量B介子的影响

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-16 DOI: 10.1016/j.nuclphysa.2026.123330

Tanisha, Satyajit Puhan, Navpreet Kaur, Harleen Dahiya, Arvind Kumar

In this study, we examine how an isospin asymmetric nuclear medium affects the properties of pseudoscalar (

B^{+}, B^{0}

) and vector (

B^{* +}, B^{* 0}

) mesons under different temperature values and degrees of isospin asymmetry, using the light-front quark model. To simulate the in-medium modifications of the constituent quark masses, we employ the chiral SU(3) quark mean field model. Our analysis focuses on evaluating the effective masses, weak decay constants, and distribution amplitudes (DAs) of B mesons in isospin-asymmetric nuclear matter. The calculated vacuum values of the B meson masses and decay constants show good agreement with existing experimental data, validating our approach to study the medium effects within the same framework.

在本研究中，我们利用光前夸克模型研究了在不同温度值和不同的同位旋不对称程度下，核介质对伪标量介子（B+,B0）和矢量介子（B*+,B*0）性质的影响。为了模拟组成夸克质量在介质中的变化，我们采用了手性SU(3)夸克平均场模型。我们的分析侧重于评估B介子在同位旋不对称核物质中的有效质量、弱衰变常数和分布振幅（DAs）。计算得到的B介子质量和衰变常数的真空值与已有的实验数据吻合较好，验证了我们在同一框架内研究介质效应的方法。

引用次数: 0

Insights into the exotic charged states Zb(10610) and Zb(10650) from their photoproduction off nuclei 从它们的光产生离核中对奇异带电态Zb（10610）和Zb（10650）的洞察

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-16 DOI: 10.1016/j.nuclphysa.2026.123331

E.Ya. Paryev

The possibility to study the nature of the famous charged bottomonium-like states Z_b(10610) and Z_b(10650), which is by far the best known, from their inclusive photoproduction off nuclei near the kinematic threshold is investigated within the collision model based on the nuclear spectral function. The model accounts for Z_b(10610)^± and Z_b(10650)^± production in direct photon–nucleon interactions as well as four different scenarios for their intrinsic configurations: compact tetraquarks, molecules of the two open-beauty mesons and two mixtures of both of them for each of Z_b state. We calculate within these scenarios the absolute and relative excitation functions on ¹²C and ¹⁸⁴W nuclei at photon energies of 61–90 GeV, the absolute momentum differential cross sections and ratios of them for their production off these target nuclei at laboratory polar angles of 0^∘–5^∘ and for photon energy of 75 GeV as well as the A-dependences of the transparency ratios for the Z_b(10610)^± mesons at photon energy of 75 GeV. We show that the absolute and relative observables considered reveal distinct sensitivity to the Z_b(10610)^± and Z_b(10650)^± internal structures. Therefore, they might be useful for the determination of these structures from the comparison of them with the experimental data from the future high-precision experiments at the upcoming experimental facilities, such as the planned high-luminosity electron-ion colliders in the United States and China.

在基于核谱函数的碰撞模型中，研究了迄今为止最著名的带电类底态Zb（10610）和Zb（10650）的性质的可能性，从它们在运动阈值附近的包含光产生核中进行了研究。该模型考虑了Zb（10610） ± 和Zb（10650） ± 在光子-核子直接相互作用下的产生，以及它们的内在构型的四种不同情况：紧致四夸克、两个开美介子的分子和Zb状态下两者的两种混合物。在这些情况下，我们计算了光子能量为61-90 GeV的12C和184W核的绝对和相对激发函数，在实验室极性角为0°-5°和光子能量为75 GeV时产生的绝对动量微分截面和比值，以及光子能量为75 GeV时Zb（10610） ± 介子的透明比与a的依赖关系。我们表明，考虑的绝对观测值和相对观测值对Zb（10610） ± 和Zb（10650） ± 内部结构具有明显的敏感性。因此，将它们与未来在即将到来的实验设施（如计划在美国和中国的高亮度电子-离子对撞机）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。

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引用次数: 0

Two neutrino double electron capture of 78Kr and 130Ba in the QRPA framework QRPA框架中78Kr和130Ba的两个中微子双电子捕获

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-15 DOI: 10.1016/j.nuclphysa.2026.123333

Serdar Ünlü

A detailed quasi-particle random phase approximation (QRPA) analysis of two neutrino double electron capture transitions to the ground states and first excited states of ⁷⁸Se and ¹³⁰Xe is given in the present work. The experimental data related to the intermediate and final excited states have been reproduced using the adjustable strength parameters. The nuclear matrix elements and half-lives for two neutrino double electron capture have been calculated and compared with other calculations and corresponding experimental data. It can be said that the present approximation is usually successful in reproducing the experimental half-lives for two neutrino double electron capture.

本文对78Se和130Xe两个中微子双电子捕获跃迁到基态和第一激发态进行了详细的准粒子随机相位近似（QRPA）分析。利用可调强度参数再现了与中间激发态和最终激发态有关的实验数据。计算了两个中微子双电子捕获的核矩阵元素和半衰期，并与其他计算和相应的实验数据进行了比较。可以说，目前的近似通常是成功地再现了两个中微子双电子捕获的实验半衰期。

引用次数: 0

Extraction of the potential energy in mass asymmetry coordinate from experimental mass distributions of f and m isotopes 从f和m同位素的实验质量分布中提取质量不对称坐标中的势能

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2026-01-14 DOI: 10.1016/j.nuclphysa.2026.123334

Evelyn Schuller , Horia Paşca

Understanding the potential energy landscape of fissioning nuclei is crucial for improving nuclear models and predicting fission fragment formation. In this study, we extract the potential energy in the mass coordinate from experimental mass distributions of Cf and Fm isotopes, assuming statistical equilibrium in the fissioning nucleus. By comparing the extracted potentials with those predicted by the statistical scission-point model, we investigate the validity of the equilibrium assumption and the accuracy of fission fragment formation at scission.

了解裂变原子核的势能格局对于改进核模型和预测裂变碎片的形成至关重要。在本研究中，我们从Cf和Fm同位素的实验质量分布中提取质量坐标中的势能，假设裂变核中的统计平衡。通过将提取的电位与统计断裂点模型预测的电位进行比较，我们研究了平衡假设的有效性和裂变碎片在断裂时形成的准确性。

引用次数: 0

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