Few-Body Systems最新文献

Numerical Study of the Two-Boson Bound-State Problem with and Without Partial-Wave Decomposition 带和不带部分波分解的双玻色子束缚态问题的数值研究

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-05-08 DOI: 10.1007/s00601-026-02051-w

Wolfgang Schadow

{"title":"Numerical Study of the Two-Boson Bound-State Problem with and Without Partial-Wave Decomposition","authors":"Wolfgang Schadow","doi":"10.1007/s00601-026-02051-w","DOIUrl":"10.1007/s00601-026-02051-w","url":null,"abstract":"<div><p>The validation of numerical methods is a prerequisite for reliable few-body calculations, particularly when moving beyond standard partial-wave decompositions. In this work, we present a precision benchmark for the two-boson bound-state problem, solving it using two complementary formulations: the standard one-dimensional partial-wave Lippmann–Schwinger equation and a two-dimensional formulation based directly on vector variables. While the partial-wave approach is computationally efficient for low-energy bound states, the vector-variable formulation becomes essential for scattering applications at higher energies where the partial-wave expansion converges slowly. We demonstrate the high-precision numerical equivalence of both methods using rank-one separable Yamaguchi potentials and non-separable Malfliet–Tjon interactions. Furthermore, for the Yamaguchi potential, we derive exact analytical expressions quantifying the systematic errors introduced by finite momentum- and coordinate-space cut-offs. These analytical bounds provide a rigorous tool for disentangling discretization errors from truncation effects in few-body codes. The results establish a highly controlled methodological benchmark that provides a detailed baseline for vector-variable algorithms intended for more complex three- and four-body calculations.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scale Invariance Breaking and Discrete Phase Invariance in Few-Body Problems 小体问题中的尺度不变性、破缺和离散相不变性

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-05-07 DOI: 10.1007/s00601-026-02054-7

Satoshi Ohya

引用次数: 0

Phase Space Representation for the Inversely Quadratic Hellmann-Kratzer Potential 逆二次型Hellmann-Kratzer势的相空间表示

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-05-07 DOI: 10.1007/s00601-026-02057-4

Othmane Cherroud, Sid-Ahmed Yahiaoui

{"title":"Phase Space Representation for the Inversely Quadratic Hellmann-Kratzer Potential","authors":"Othmane Cherroud, Sid-Ahmed Yahiaoui","doi":"10.1007/s00601-026-02057-4","DOIUrl":"10.1007/s00601-026-02057-4","url":null,"abstract":"<div><p>In this work, we develop a phase space formulation of quantum mechanics to investigate the inversely quadratic Hellmann-Kratzer (IQHK) potential, with the aim of simultaneously constructing the Wigner distribution and the corresponding characteristic functions. By employing Weyl transformations, we establish two independent computational approaches, each yielding explicit and generalized analytical expressions for higher-order moments and momentum. In addition, we derive a generalized analytical formulation of the momentum operator and establish a corresponding generalized expression of Heisenberg’s uncertainty principle, explicitly dependent on the quantum numbers <i>n</i> and <i>L</i>. This constitutes a novel and complementary contribution to the study of the IQHK potential. Furthermore, the key transformation employed in phase space enabled us to derive a generalized analytical expression for the energy levels <span>(E_{n,L})</span>. These energy levels are numerically evaluated and exhibit excellent agreement with previously published results for all special cases of the IQHK potential across various diatomic molecular systems. Furthermore, we verify that our results are consistent with the canonical Heisenberg-Born-Jordan-Dirac commutation relations and Heisenberg’s uncertainty principle, thereby confirming the robustness and reliability of the proposed methodology within this framework.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147830116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Immiscible to Miscible Quenching Instabilities in Two-Dimensional Binary Bose-Einstein Condensates 二维二元玻色-爱因斯坦凝聚体的非混相到混相猝灭不稳定性

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-05-06 DOI: 10.1007/s00601-026-02053-8

Lauro Tomio, S. Sabari, A. Gammal, R. K. Kumar

{"title":"Immiscible to Miscible Quenching Instabilities in Two-Dimensional Binary Bose-Einstein Condensates","authors":"Lauro Tomio, S. Sabari, A. Gammal, R. K. Kumar","doi":"10.1007/s00601-026-02053-8","DOIUrl":"10.1007/s00601-026-02053-8","url":null,"abstract":"<div><p>Immiscible to miscible quenching transitions (IMQT) in homogeneous Bose-Einstein condensate are investigated, considering rubidium isotopes <span>(^{85})</span>Rb and <span>(^{87})</span>Rb confined in a two-dimensional (2D) circular box, under two different initial configurations. These IMQT instabilities, triggered by sudden reductions in the two-body interspecies scattering length <span>(a_{12})</span>, are explored under two distinct initial conditions, highlighting the critical role of nonlinear dynamics in their evolution. The numerical simulations indicate that the instability dynamics are primarily driven by the production of large vortices and the propagation of sound waves (phonons), with sound wave excitations prevailing in the long-term evolution. The compressible and incompressible parts of the kinetic energy spectra, in terms of the wave number <i>k</i>, are confronted with the classical Kolmogorov scaling, <span>(k^{-5/3})</span> for turbulence, which is observed in the onset of instabilities. Before reaching the ultraviolet dissipation region at small scales, the IMQT spectra exhibit a bottleneck effect, indicating a clear departure from classical scaling behavior. In the time asymptotic miscible regime, it is observed that the vorticity and sound-wave production remain practically stable. In this regime, for both cases investigated, a linear relation is also recognized between the miscibility parameter and the initial IMQT configuration.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-026-02053-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multipole-Resolved Nuclear Transition Strengths of (^{12})C Induced by Mono-Energetic KDAR Neutrinos 单能量KDAR中微子诱导(^{12}) C的多极分辨核跃迁强度

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-20 DOI: 10.1007/s00601-026-02049-4

Chaeyun Lee, Kyungsik Kim, Eunja Ha, Myung-Ki Cheoun

引用次数: 0

Calculation of Cross Sections for (textrm{H}^+)-(textrm{H}^-) Collision using the Close-Coupling Method 用紧密耦合法计算(textrm{H}^+) - (textrm{H}^-)碰撞截面

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-19 DOI: 10.1007/s00601-026-02047-6

Akinori Igarashi

引用次数: 0

High-precision spectroscopy of (Lambda ) hypernuclei with electron and meson beams 电子和介子光束(Lambda )超核的高精度光谱学

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-14 DOI: 10.1007/s00601-026-02044-9

Satoshi N. Nakamura

{"title":"High-precision spectroscopy of (Lambda ) hypernuclei with electron and meson beams","authors":"Satoshi N. Nakamura","doi":"10.1007/s00601-026-02044-9","DOIUrl":"10.1007/s00601-026-02044-9","url":null,"abstract":"<div><p>High-precision spectroscopy of <span>(Lambda )</span> hypernuclei provides essential information on the <span>(Lambda N)</span> interaction and on the structure of strange nuclear many-body systems. It is also closely related to current topics in few-body physics and nuclear astrophysics, including charge-symmetry breaking in <span>(Lambda )</span> hypernuclei, the hypertriton puzzle, possible neutron-rich light hypernuclear systems, and the hyperon puzzle in neutron stars. In this article, I review ongoing and planned spectroscopic studies of <span>(Lambda )</span> hypernuclei with complementary probes at JLab, MAMI, and J-PARC. Electron-induced reactions such as <span>((e,e'K^+))</span> offer excellent absolute energy calibration and high-resolution spectroscopy for light-to-heavy hypernuclei. Decay-pion spectroscopy of electroproduced hypernuclei provides a powerful method for precise binding-energy studies of light systems, particularly the hypertriton. At J-PARC, the planned High-Intensity, High-Resolution beamline will enable high-intensity, high-resolution <span>((pi ^+,K^+))</span> spectroscopy over a wide mass range and open a path toward a hypernuclear factory. The complementarity of these approaches will play a key role in establishing a comprehensive and precise picture of <span>(Lambda )</span> hypernuclear structure from few-body systems to heavy hypernuclei.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-026-02044-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flavor-Dependent Dynamical Spin-Orbit Coupling in Light-Front Holographic QCD: A New Approach to Baryon Spectroscopy 光前全息QCD中风味相关的动态自旋-轨道耦合：重子光谱的新方法

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-08 DOI: 10.1007/s00601-026-02033-y

Fidele J. Twagirayezu

{"title":"Flavor-Dependent Dynamical Spin-Orbit Coupling in Light-Front Holographic QCD: A New Approach to Baryon Spectroscopy","authors":"Fidele J. Twagirayezu","doi":"10.1007/s00601-026-02033-y","DOIUrl":"10.1007/s00601-026-02033-y","url":null,"abstract":"<div><p>We propose a novel extension of Light-Front Holographic Quantum Chromodynamics (LFHQCD) in which a <i>flavor-dependent, dynamical spin–orbit potential</i> is introduced at the level of the light-front Hamiltonian. The potential varies with the holographic coordinate and is motivated by the Gaussian localization of soft-wall modes and by heavy-quark symmetry, providing a unified treatment of short- and long-distance spin–orbit dynamics in both light and heavy baryons. An optional coupling to a holographic glueball background further enriches the nonperturbative structure of the model and enhances the description of excited states. The resulting modified light-front wave equation reproduces the observed flavor-dependent mass splittings and Regge trajectories, and yields substantially improved agreement with the baryon spectrum compared to flavor-independent holographic approaches. We present the analytic formulation, numerical implementation, and global parameter fits, together with phenomenological predictions relevant for ongoing and future heavy-baryon spectroscopy programs, including LHCb and Belle II. This soft-wall–compatible framework provides a unified and analytically transparent extension of LFHQCD that successfully incorporates dynamical spin–orbit effects across all quark flavors.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Elementary Operator for Kaon Photoproduction on the Nucleon and Nuclei 核子和原子核上Kaon光产生的新基本算子

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-06 DOI: 10.1007/s00601-026-02038-7

Terry Mart, Jovan Alfian Djaja

{"title":"New Elementary Operator for Kaon Photoproduction on the Nucleon and Nuclei","authors":"Terry Mart, Jovan Alfian Djaja","doi":"10.1007/s00601-026-02038-7","DOIUrl":"10.1007/s00601-026-02038-7","url":null,"abstract":"<div><p>A new elementary operator for kaon photoproduction on the nucleon and nuclei has been developed within a Feynman diagrammatic framework. By fitting the unknown coupling strengths at the electromagnetic and hadronic vertices of the baryon resonances to all available experimental data across the six isospin channels, the model achieves excellent agreement with the data. The operator includes 26 nucleon resonances in the <span>(KLambda )</span> channels and 17 additional <span>(Delta )</span> resonances in the <span>(KSigma )</span> channels. For applications to nuclear reactions, such as hypernuclear photoproduction, the operator is formulated in Pauli space, allowing a straightforward implementation of the nonrelativistic approximation. Several alternative forms for expressing the operator output are proposed. In one of them, the spin operators and photon polarization vectors are separated from the operator, since both are frame dependent, thereby enhancing its versatility in nuclear applications. As an illustration of the operator’s application in the nuclear sector, we present the results for hypertriton photoproduction on <span>(^3)</span>He and compare the calculations based on the present operator with those obtained by using Kaon-Maid.</p></div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relativistic Feshbach-Villars Equation for Two Spin-0 Particles 两个自旋为0的粒子的相对论Feshbach-Villars方程

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-06 DOI: 10.1007/s00601-026-02042-x

Z. Papp

引用次数: 0