Nuclear Physics A最新文献

英文中文

Momentum distributions, chemical potential, and free energy of asymmetric nuclear matter using the static fluctuation approximation 使用静态涨落近似的不对称核物质的动量分布、化学势和自由能

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-22 DOI: 10.1016/j.nuclphysa.2025.123268

Mohamed K. Al-Sugheir , Bassam R. Joudeh , O. Abu-Haija , Ibtisam F. Al-Maaitah , Derar Altarawneh , Sufian Alnemrat , Humam B. Ghassib

The Static Fluctuation Approximation (SFA) is used to calculate the momentum distributions, chemical potentials, and Helmholtz (free) energy of asymmetric nuclear matter with the Argonne interaction potential AV₁₈. The results indicate that, as the linear momentum

k \to 0

, the momentum distributions of both neutrons and protons increase with decreasing temperature. Further, in this limit, the momentum distributions increase with increasing number density ρ. In symmetric nuclear matter, the momentum distributions of neutrons and protons are, of course, identical. In contrast, however, in asymmetric nuclear matter, as the isospin-asymmetric parameter increases, the momentum distribution of neutrons increases; whereas that of protons decreases. The chemical potential results show that the Fermi temperature of neutrons is greater than that of protons, i.e., the neutrons remain in the quantum regime at a temperature greater than that for the protons. We also find that, in the low ρ-limit, both protons and neutrons exist in the classical regime. The protons cross over from the classical to the quantum regime at a density greater than that for the neutrons. The Helmholtz energy is calculated as a function of ρ, temperature, and isospin parameter. It increases with ρ, decreases with temperature, and exhibits a parabolic dependence on the isospin parameter.

Our results agree quite well with those of other theoretical approaches. Together with our previous SFA work, the present calculations demonstrate yet again the reliability of this formalism for low-energy, nonrelativistic nuclear matter.

采用静态涨落近似（SFA）计算了具有Argonne相互作用势AV18的非对称核物质的动量分布、化学势和亥姆霍兹（自由）能。结果表明，当线性动量k→0时，中子和质子的动量分布随温度的降低而增大。此外，在这个极限下，动量分布随着数量密度ρ的增加而增加。在对称核物质中，中子和质子的动量分布当然是相同的。相反，在非对称核物质中，随着同位旋不对称参数的增大，中子的动量分布增大；而质子的能量减少了。化学势结果表明，中子的费米温度大于质子的费米温度，即中子保持在量子态的温度大于质子的温度。我们还发现，在低ρ极限下，质子和中子都存在于经典状态。质子以比中子更大的密度从经典态过渡到量子态。亥姆霍兹能是ρ、温度和同位旋参数的函数。它随ρ增大，随温度降低，并与同位旋参数呈抛物线关系。我们的结果与其他理论方法的结果相当一致。结合我们以前的SFA工作，现在的计算再次证明了这种形式对于低能量、非相对论性核物质的可靠性。

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引用次数: 0

Theoretical investigation of ternary and quaternary fission of 252Cf using equatorial and collinear configuration 用赤道和共线构型研究252Cf的三元和四元裂变

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-14 DOI: 10.1016/j.nuclphysa.2025.123263

Chahat Jindal, Manoj K. Sharma

The radioactive nucleus

^{252}

Cf can undergo rare decay modes in which it may split into three or four distinct fragments, known as ternary and quaternary fission, respectively. This study investigates these processes using fragmentation potential calculations, with emphasis on surface separation effects and geometrical configuration. For ternary fission, calculations show that the most probable fragment combination

^{132}

Sn (

Z = 50, N = 82

) +

^{4}

He (

Z = 2, N = 2

) +

^{116}

Pd (

Z = 46, N = 70

) is independent of surface separation and configuration, although there is significant difference in the magnitude of fragmentation potential, particularly at higher separation distance. In addition, quaternary fission analysis is performed for both equatorial and collinear configurations, considering various light charged particles as middle fragments. In the equatorial configuration, lighter middle-fragment pairs exhibit lower potential barriers and higher emission probabilities, whereas heavier pairs are suppressed due to stronger Coulomb repulsion.

放射性核252Cf可以经历罕见的衰变模式，它可以分裂成三个或四个不同的碎片，分别称为三元裂变和四元裂变。本研究使用破碎电位计算来研究这些过程，重点是表面分离效应和几何构型。对于三元裂变，计算表明，最可能的碎片组合132Sn (Z=50，N=82) + 4He (Z=2，N=2) + 116Pd （Z=46，N=70）与表面分离和构型无关，但碎片势的大小有显著差异，特别是在较高的分离距离下。此外，考虑各种轻带电粒子作为中间碎片，对赤道和共线构型进行了四元裂变分析。在赤道构型中，较轻的中间碎片对表现出较低的势垒和较高的发射概率，而较重的中间碎片对由于更强的库仑排斥而被抑制。

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引用次数: 0

The effect of the entrance channel properties in formation of the reaction products in heavy ion collisions 入口通道性质对重离子碰撞反应产物形成的影响

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-11 DOI: 10.1016/j.nuclphysa.2025.123262

Avazbek Nasirov , Elzod Khusanov , Bakhodir Kayumov , Orifjon Ganiev , Azimboy Yusupov , Abrorbek Safarov

The hindrance to complete fusion is studied as the increase of the yield of the quasifission products. The formation and breakup of a dinuclear system (DNS) in the heavy ion collisions at energies near the Coulomb barrier has been calculated in the framework of the DNS model as a function of the orientation angles of colliding nuclei. The nucleon transfer from the light fragment to the heavy one leads to the formation of a compound nucleus (CN). But the DNS can break up into two fragments (so called quasifission process) rather than reaching an equilibrated CN state. Consequently, the quasifission causes decreasing a number of events leading to complete fusion. Therefore, a study of the role of orientation angles and angular momentum in the mass distribution of the reaction products for the given mass asymmetry of the colliding nuclei allows us to establish a nature of the hindrance. The results of this work have been compared with the measured data for the quasifission yields in the

^{48}

Ca+

^{168}

Er reaction to show the role of orientation angles of colliding nuclei.

研究了准裂变产物产率的增加对完全聚变的阻碍。在库仑势垒附近的重离子碰撞模型框架内，计算了双核系统（DNS）的形成和破裂，并将其作为碰撞核取向角的函数。核子从轻片段转移到重片段，形成复合核（CN）。但是DNS可能会分裂成两个片段（所谓的准分裂过程），而不是达到一个平衡的CN状态。因此，准裂变导致导致完全聚变的一系列事件的减少。因此，在给定碰撞核质量不对称的情况下，对取向角和角动量在反应产物质量分布中的作用进行研究，使我们能够确定障碍的性质。将所得结果与48Ca+168Er反应准裂变产率的实测数据进行了比较，证明了碰撞核取向角对准裂变产率的影响。

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引用次数: 0

Inclusive and exclusive breakup studies in 10B+209Bi system 10B+209Bi系统的包容性和排他性分手研究

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-11 DOI: 10.1016/j.nuclphysa.2025.123264

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

Elastic scattering and various particle (

α

^{6, 7}

Li,

^{9, 10}

Be, and

^{11}

B) production angular distributions have been measured with

^{10}

B projectile on

^{209}

Bi target at 54 MeV beam energy. The optical model calculation was performed for the elastic scattering angular distribution and the reaction cross section was estimated. The

α

particle production cross section was found to be dominant than other particles production. The sum of measured particle production cross sections and the reported value of complete fusion cross section [1] is found to match reasonably well with the estimated reaction cross section. Charged particle coincidence analysis was also performed to identify various breakup and transfer followed by breakup channels.

在54 MeV束流能量下，用10B弹丸在209Bi靶上测量了弹性散射和各种粒子（α, 6,7Li, 9,10Be和11B）产生角分布。对弹性散射角分布进行了光学模型计算，并估计了反应截面。α粒子产生截面比其他粒子产生截面占优势。实测粒子产生截面和报告的完全聚变截面[1]值的总和与估计的反应截面相当吻合。通过带电粒子符合性分析，确定了各种破裂和转移以及随后的破裂通道。

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引用次数: 0

Interaction- and charge-changing cross sections for neutron-rich 63−80Cu isotopes toward the derivation of neutron skin thickness 富中子63−80Cu同位素相互作用和电荷变化截面对中子蒙皮厚度的推导

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-08 DOI: 10.1016/j.nuclphysa.2025.123261

G. Takayama , M. Fukuda , M. Tanaka , M. Fukutome , M. Takechi , T. Suzuki , A. Homma , D. Nishimura , T. Moriguchi , D.S. Ahn , A. Aimaganbetov , M. Amano , M. Amitani , H. Arakawa , H. Baba , S. Bagchi , K.-H Behr , N. Burtebayev , K. Chikaato , H. Du , T.K. Zholdybayev

We have measured the interaction cross sections (

σ_{I}

) and charge-changing cross sections (

σ_{cc}

) for neutron-rich copper isotopes with mass numbers

A = 63 - 80

using the transmission method at the RIBF facility, RIKEN. From these values, we aim to derive the proton distribution radius (

R_{p}

) and the neutron distribution radius (

R_{n}

) for each isotope through subsequent analysis. Then, we plan to determine the neutron skin thickness (

Δ R_{np} = R_{n} - R_{p}

) for each isotope. These results will provide a new constraint on the symmetry energy parameter

L

of the equation of state (EoS) of nuclear matter and contribute to a deeper understanding of the nuclear structure of exotic nuclei.

用透射法测量了质量数A=63 ~ 80的富中子铜同位素的相互作用截面（σI）和电荷变化截面（σcc）。根据这些值，我们的目标是通过后续分析得出每种同位素的质子分布半径（Rp）和中子分布半径（Rn）。然后，我们计划确定每种同位素的中子蒙皮厚度（ΔRnp=Rn−Rp）。这些结果将为核物质的态方程（EoS）的对称能参数L提供一个新的约束，并有助于对外来核的核结构有更深的理解。

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引用次数: 0

Quarkonia spectrum and wave functions with different trial basis in the potential model approach 势模型方法中不同试基的夸克谱和波函数

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-03 DOI: 10.1016/j.nuclphysa.2025.123253

David Molina , Cristian Gutiérrez Gómez

A numerical analysis based on the variational approach, using three different bases within a non-relativistic formalism, is performed to calculate the spectrum and wave functions of hydrogen atom and charmonium systems. Specifically, the Harmonic Oscillator, Generalized Harmonic Oscillator, and Gaussian bases are considered for this analysis. For the charmonium system, a non-relativistic kinetic energy is employed and the quark-antiquark interaction is represented by the Cornell potential plus the hyperfine interaction. The advantages of each basis are compared, with a focus on the spectrum and wave functions of the ground state and some excited states.

基于变分方法的数值分析，在非相对论的形式中使用三种不同的基，进行了氢原子和谐波系统的谱函数和波函数的计算。具体地说，谐振子、广义谐振子和高斯基被考虑在这个分析中。对于调和态系统，采用非相对论动能，夸克-反夸克相互作用用康奈尔势加超精细相互作用表示。比较了每种基的优点，重点讨论了基态和一些激发态的谱和波函数。

引用次数: 0

Lifetime measurements with fast timing scintillation detectors at VECC, Kolkata 加尔各答VECC快速计时闪烁探测器的寿命测量

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-01 DOI: 10.1016/j.nuclphysa.2025.123254

T. Bhattacharjee , A. Pal , D. Kumar , S. Basak , S.S. Alam

The developments on lifetime measurements with fast timing scintillation detectors at VECC, Kolkata has been discussed. Different aspects of the

γ - γ

fast timing facility VENTURE (VECC array for Nuclear fast Timing and angUlar corRElation studies) has been outlined in the light of level lifetime measurement with electronic fast timing technique. The exotic structures of the nuclei with A

\sim

130 and A

\sim

150, studied using the fast timing setups, have been elaborated. The plan for future development of the second phase of VENTURE, i.e. VENTURE-2.0 has been shown along with its progress till date.

本文讨论了加尔各答VECC快速计时闪烁探测器在寿命测量方面的进展。在用电子快定时技术测量能级寿命的情况下，概述了γ−γ快定时设施VENTURE（用于核快定时和角相关研究的VECC阵列）的不同方面。利用快速定时装置研究了A ~ 130和A ~ 150核的奇异结构。VENTURE第二阶段的未来发展计划，即VENTURE-2.0，已经与目前的进展一起展示。

引用次数: 0

The 7Be(d, α)5Li(p α) and 7Be(d, p)8Be*(p 7Li) reactions at 5 MeV/u 5mev /u下7Be(d, α)5Li（p α）和7Be(d, p)8Be*(p 7Li)反应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-28 DOI: 10.1016/j.nuclphysa.2025.123249

S. Samanta , D. Gupta , Sk. M. Ali , R. Mitra , K. Kundalia , S. Maity , N. Ghosh , S.K. Saha , O. Tengblad , A. Perea , I. Martel , J. Cederkall

The

^{7}

Be(d,

α)^{5}

Li and

^{7}

Be(d, p)

^{8}

^{*}

^{7}

Li) reactions are studied at 5 MeV/u in the context of the cosmological lithium problem. This work aims to probe the contribution of

^{7}

Be destruction mechanisms, particularly through channels that populate intermediate unbound states of

^{5}

Li and

^{8}

Be. The contribution of

^{7}

Be(d,

α

)

^{5}

Li(p

α

) reaction is separated from the

^{7}

Be(d, p)

^{8}

^{*} (2 α)

reaction. The

^{7}

Be(d, p)

^{8}

^{*}

_{1}

^{7}

^{*}

) channel is also identified and is useful for an indirect study of the

^{7}

Be(n, p

_{1})^{7}

^{*}

reaction.

在宇宙锂问题的背景下，研究了7Be(d, α)5Li和7Be(d, p)8Be*(p 7Li)在5 MeV/u下的反应。这项工作旨在探索7Be破坏机制的贡献，特别是通过填充5Li和8Be的中间非束缚态的通道。7Be(d, α)5Li（p α）反应的贡献从7Be(d, p)8Be*(2α)反应中分离出来。还鉴定了7Be(d, p)8Be*(p1 7Li*)通道，该通道可用于间接研究7Be(n, p1)7Li*反应。

引用次数: 0

Breakup and isotopic effects in the scattering of 6,7,8Li projectiles from a 9Be target 6、7、8锂弹丸从9Be靶上散射时的破碎和同位素效应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-27 DOI: 10.1016/j.nuclphysa.2025.123252

D.S. Valiolda , D.M. Janseitov , K. Mendibayev , A. Azhibekov , G. Saidullaeva , Nuha Mutairi , B. Alshahrani , Sh. Hamada , Awad A. Ibraheem

We reanalyze elastic angular distributions (ADs) for ^6,7,8Li + ⁹Be scattering in the 11–30 MeV energy range using semi-microscopic potentials. This study examines how weakly bound (WB) projectiles affect elastic scattering, focusing on breakup effects and isotopic dependencies. Through systematic tests of double-folding potentials (SPP, BDM3Y1, CDM3Y1, and CDM3Y6), we identify distinct behaviors: ⁶Li shows enhanced breakup due to its low binding energy (1.47 MeV), whereas ⁸Li’s neutron-halo structure promotes transfer channels. The persistent imaginary potential near the Coulomb barrier confirms the breakup threshold anomaly (BTA). These results improve our understanding of nuclear reaction dynamics and have implications for astrophysical processes involving light nuclei.

我们利用半微观势重新分析了11-30 MeV范围内6,7,8 li + 9Be散射的弹性角分布（ADs）。本研究探讨了弱束缚（WB）弹丸如何影响弹性散射，重点是破裂效应和同位素依赖性。通过对双折叠电位（SPP, BDM3Y1， CDM3Y1和CDM3Y6）的系统测试，我们发现了不同的行为：6Li由于其低结合能（1.47 MeV）而表现出增强的分裂，而8Li的中子晕结构促进了转移通道。在库仑势垒附近持续存在的假想电位证实了破裂阈值异常（BTA）。这些结果提高了我们对核反应动力学的理解，并对涉及轻核的天体物理过程具有启示意义。

引用次数: 0

Low-j rotational bands in 127Xe 127Xe的低j旋转带

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-25 DOI: 10.1016/j.nuclphysa.2025.123251

S. Chakraborty , S. Bhattacharyya , S.S. Nayak , Soumik Bhattacharya , G. Mukherjee , Snigdha Pal , S. Panwar , Suchorita Paul , S. Jehangir , G.H. Bhat , J.A. Sheikh , C. Majumder , A. Sharma , Pankaj K. Giri , R. Raut , S.S. Ghugre

Low-lying one-quasineutron bands, primarily associated with the low-j

ν s_{1 / 2}

and

ν d_{3 / 2}

quasiparticle configurations, have been investigated by means of in-beam

γ

-ray spectroscopy. Excited states were populated through the bombardment of a ²H beam with an energy of 15 MeV on an elemental ¹²⁷I target. This study confirms the previously identified, feebly populated unfavoured signature partner of the

ν d_{3 / 2}

band, and provides firm spin and parity assignments for two low-lying states within this band. Theoretical calculations using the Triaxial Projected Shell Model reproduce the experimental observations well.

用束内γ射线能谱法研究了主要与低j νs1/2和νd3/2准粒子构型有关的低洼单准中子带。激发态是通过能量为15 MeV的2H光束轰击元素127I目标而填充的。这项研究证实了先前确定的、人口稀少的不受欢迎的νd3/2波段的特征伙伴，并为该波段内的两个低洼状态提供了确定的自旋和宇称分配。利用三轴投影壳模型进行的理论计算较好地再现了实验观测结果。

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引用次数: 0

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