# Few-Body Systems Journal Impact Factor & Information

Publisher: Springer Verlag

## Journal description

The journal is devoted to the publication of original research work both experimental and theoretical in the field of few-body systems. Conceptually such systems are understood as consisting of a small number of well-defined constituent structures. Investigations of the behaviour of these systems form the central subject matter of the journal. Systems for which an equivalent one-body description is available or can be designed and large systems for which specific many-body methods are needed are outside the scope of the journal. The focus of interest lies in the research methods properties and results characteristic of few-body systems. Particular examples of few-body systems are light nuclei light atoms small molecules but also celestial systems "elementary" particles (considered as systems of few constituents) or larger systems with a few-particle substructure. The principal aim of the journal is to bring together competent work from various fields of physics such as particle nuclear atomic molecular and condensed-matter physics and also from astrophysics astronomy mathematics and chemistry thereby fostering research done on related problems in different areas of natural sciences. While concentrating on few-body systems which can also be characterized as generally amenable to rigorous solutions the journal stresses interdisciplinarity through the exchange of ideas methods results experience and knowledge gathered in neighbouring fields. Beyond the publication of articles the journal as a forum for the community of scientists engaged in the study of few-body problems also provides for the rapid dissemination of actual scientific and practical information in separate News Sections; these include abstracts of recent preprints a calendar of conferences and meetings book reviews announcements etc. Though the emphasis is on regular research articles the journal publishes also papers in the form of letters rapid communications comments and from time to time reviews or progress reports.

## Impact Factor Rankings

2015 Impact Factor Available summer 2016 0.768 1.508 1.047 1.438 0.622 0.468 1.014 0.856 0.765 1.182 1.948 1.034 1.773 1.857 1.552 1.26 1.359 0.582 1.82 1.891 1.377 2.185 1.02

## Impact factor over time

Impact factor
.
Year

5-year impact 0.79 3.60 0.27 0.00 0.27 Few-Body Systems website Few-body systems (Online), Acta physica Austriaca new series 0177-7963 41983736 Document, Periodical, Internet resource Internet Resource, Computer File, Journal / Magazine / Newspaper

## Publisher details

• Pre-print
• Author can archive a pre-print version
• Post-print
• Author can archive a post-print version
• Conditions
• Author's pre-print on pre-print servers such as arXiv.org
• Author's post-print on author's personal website immediately
• Author's post-print on any open access repository after 12 months after publication
• Publisher's version/PDF cannot be used
• Published source must be acknowledged
• Must link to publisher version
• Set phrase to accompany link to published version (see policy)
• Articles in some journals can be made Open Access on payment of additional charge
• Classification
green

## Publications in this journal

• ##### Article: The Gaussian Atomic Orbital Multiplied by a Field-Dependent Gauge Phase for the Hydrogen Molecular Ion in Non-aligned Magnetic Fields
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ABSTRACT: We multiply the anisotropic Gaussian atomic orbital by a field-dependent gauge phase to describe the wave function for the hydrogen molecular ion in non-aligned magnetic fields. With the kind of basis set, the convergence of the total energy at the equilibrium distance for the 1u state is much improved compared to the same atomic orbital without the gauge phase. For 2.35 × 104 ≤ B ≤ 107 T, better total energies of the 1u state at the corresponding equilibrium are obtained for the deviations 15°–90° of the magnetic field relative to the molecular axis. The result also shows that, there is a transition of the equilibrium configuration from the vertical orientation to the parallel orientation with increasing field strength.
Few-Body Systems 10/2015; DOI:10.1007/s00601-015-1029-1
• ##### Article: Equilibrium Points in the Restricted Four-Body Problem with Radiation Pressure
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ABSTRACT: This paper studies numerically the photogravitational version of the restricted four-body problem, where an infinitesimal particle is moving under the gravitational attraction and radiation pressure of three bodies much bigger than the particle, the primaries. The fourth body does not affect the motion of the three bodies. These bodies are always at the vertices of an equilateral triangle (Lagrange configuration). We consider all the primary bodies (m1, m2, m3) as radiation sources with radiation factors of the two bodies (m2 and m3) equal. In this paper we suppose the masses of the three primary bodies are equal. It is found that the involved parameters influenced the positions of the equilibrium points. The linear stability of the relative equilibrium solutions is also studied and all these points are unstable.
Few-Body Systems 10/2015; DOI:10.1007/s00601-015-1030-8
• ##### Article: Proton Spin Sum Rule from Large Momentum Effective Field Theory
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ABSTRACT: In high energy scattering experiments, the proton spin is understood as the sum of the spin and orbital angular momentum of the quarks and gluons in Feynman’s parton picture. The Jaffe–Manohar form of the proton spin sum rule is justified as physical, and it is shown that the individual terms can be related to the proton matrix elements of certain quasi-obervables through a large momentum effective field theory. The relation is expressed as a factorization formula where the leading contribution to the quasi-observable is factorized into the parton observables and perturbative matching coefficients, and we present the results for the latter at one-loop order in perturbation theory. This will provide us with the basis to extract the proton spin content from the lattice QCD calculations of the quasi-observables.
Few-Body Systems 10/2015; 56(6). DOI:10.1007/s00601-014-0939-7
• ##### Article: Slightly Imbalanced System of a Few Attractive Fermions in a One-Dimensional Harmonic Trap
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ABSTRACT: The ground-state properties of the two-flavored mixture of a few attractive fermions confined in a one-dimensional harmonic trap is studied. It is shown that for slightly imbalanced system the pairing between fermions of opposite spins has completely different features that in the balanced case. The fraction of correlated pairs is suppressed by the presence of additional particle and another uncorrelated two-body orbital dominates in the ground-state of the system.
Few-Body Systems 10/2015; 56(10). DOI:10.1007/s00601-015-1017-5
• ##### Article: Special Issue on Systems on the Verge of Stability

Few-Body Systems 09/2015; DOI:10.1007/s00601-015-1026-4
• ##### Article: One-Dimensional Traps, Two-Body Interactions, Few-Body Symmetries. II. N Particles
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ABSTRACT: This is the second in a pair of articles that classify the configuration space and kinematic symmetry groups for $N$ identical particles in one-dimensional traps experiencing Galilean-invariant two-body interactions. These symmetries explain degeneracies in the few-body spectrum and demonstrate how tuning the trap shape and the particle interactions can manipulate these degeneracies. The additional symmetries that emerge in the non-interacting limit and in the unitary limit of an infinitely strong contact interaction are sufficient to algebraically solve for the spectrum and degeneracy in terms of the one-particle observables. Symmetry also determines the degree to which the algebraic expressions for energy level shifts by weak interactions or nearly-unitary interactions are universal, i.e.\ independent of trap shape and details of the interaction. Identical fermions and bosons with and without spin are considered. This article analyzes the symmetries of $N$ particles in asymmetric, symmetric, and harmonic traps; the prequel article treats the one, two and three particle cases.
Few-Body Systems 09/2015; DOI:10.1007/s00601-015-1025-5
• Source
##### Article: LIGHT-CONE 2014: Theory and Experiment for Hadrons on the Light-Front

Few-Body Systems 09/2015; 56(6-9). DOI:10.1007/s00601-015-0985-9
• ##### Article: Flavor Structure of Intrinsic Nucleon Sea
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ABSTRACT: The concept of intrinsic charm suggested by Brodsky et al. is extended to lighter quarks. Extraction of the intrinsic ū, d̄, and s̄ seas is obtained from an analysis of the d̄ − ū, s + s̄, and ū + d̄ − s −s̄ distributions. The connection between the intrinsic/extrinsic seas and the connected/disconnected seas in lattice QCD is also examined. It is shown that the connected and disconnected components for the ū(x) + d̄(x) sea can be separated. The striking x-dependence of the [s(x) + s̄(x)]/[ū(x) + d̄(x)] ratio is interpreted as an interplay between the connected and disconnected seas.
Few-Body Systems 09/2015; 56(6-9). DOI:10.1007/s00601-015-0951-6
• ##### Article: Does $${\mu_p G^p_E/ G^p_M}$$ μ p G E p / G M p Open a New Window on the Proton Non Valence Sector?
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ABSTRACT: Information on the non perturbative content of the proton state, in particular on the non valence contribution, could be extracted from the analysis of the ratio between the electric and magnetic form factors of the proton, given the highly accurate data from JLAB, obtained in the past and available in the very close future. This possibility is illustrated within our approach based on an Ansatz for the Bethe-Salpeter amplitude describing the quark-nucleon vertex and a Vector Meson Dominance model for the quark-photon one. After presenting a short review of our approach, able to predict the presence of a zero in the above ratio with only four free parameters fixed by three spacelike nucleon form factors, we give preliminary results for the nucleon timelike polarizations, that are quite sensitive to the Vector meson spectra.
Few-Body Systems 09/2015; 56(6-9). DOI:10.1007/s00601-015-1002-z
• ##### Article: Quantized Energy Spectrum and Modified Andreev Bound States of a Superconductor with Generalized Uncertainty Principle

Few-Body Systems 08/2015; DOI:10.1007/s00601-015-1023-7
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##### Article: Are There Good Probes for the Di-Neutron Correlation in Light Neutron-Rich Nuclei?
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ABSTRACT: The di-neutron correlation is a spatial correlation with which two valence neutrons are located at a similar position inside a nucleus. We discuss possible experimental probes for the di-neutron correlation. This includes the Coulomb breakup and the pair transfer reactions of neutron-rich nuclei, and the direct two-neutron decays of nuclei beyond the neutron drip-line.
Few-Body Systems 08/2015; DOI:10.1007/s00601-015-1027-3
• ##### Article: Efimov Physics with a Finite-Range Parameter
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ABSTRACT: Results obtained by the authors in recent works on the exploration of universality in systems living inside the Efimov window are critically analyzed. We discuss how to take into account finite-range corrections by introducing a finite-range parameter necessary to make comparisons to the universal predictions of the Efimov zero-range theory. Firstly we apply our analysis to two different calculations published by other authors. The first one has been used with success to describe ultracold Cs atoms close to a Feshbach resonance and the second one describes a four 4He atom system with a realistic interaction. Finally we use the finite-range parameter to analyze recombination data in experiments with ultracold 7Li atoms. The three selected cases support the introduction of the finite-range parameter as a valuable tool to extend the use of the zero-range theory to describe systems having finite-range interactions.
Few-Body Systems 08/2015; 56(11). DOI:10.1007/s00601-015-1021-9
• ##### Article: Quantization of the Restricted Gauge Theory of QCD2
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ABSTRACT: In this talk, we consider the restricted gauge theory of QCD2à la Cho et al. and study its quantization using Hamiltonian, path integral and BRST quantization procedures.
Few-Body Systems 08/2015; 56(6):565-569. DOI:10.1007/s00601-015-1018-4
• ##### Article: Effect of Perturbations in the Coriolis and Centrifugal Forces on the Stability of Equilibrium Points in the Restricted Four-Body Problem
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ABSTRACT: This paper studies numerically the existence, location and stability of equilibrium points under the influence of small perturbations in the Coriolis and centrifugal forces in the restricted four-body problem, where three of the bodies are finite, moving in circles around their centre of mass fixed at the origin of the coordinate system, according to the solutions of Lagrange where they are always at the vertices of an equilateral triangle, while the fourth one is infinitesimal. The fourth body does not affect the motion of the three bodies (primaries). We consider that the two masses of the primaries m2 and m3 are equal to μ and the dominant mass m1 is 1 − 2μ. The allowed regions of motion as determined by the zero-velocity surfaces and the corresponding equipotential curves are given. The equations which determine equilibrium positions of the infinitesimal mass in the rotating coordinate system are found. This is observed that their positions are affected by a small perturbation in the centrifugal force, but are unaffected by that of the Coriolis force. For different values of the perturbation parameter $${\beta (\beta = 1 + \varepsilon^{\prime}, {\vert} \varepsilon^{\prime} {\vert} \ll 1)}$$β(β=1+ε′,|ε′|≪1), we obtain two collinear and six non-collinear equilibrium points. We also examine the linear stability of these equilibrium points for a wide range of the small perturbations and all points found unstable except two (L7,8) which are stable.
Few-Body Systems 08/2015; 56(10). DOI:10.1007/s00601-015-1019-3
• ##### Article: Vector Schwinger Model with a Photon Mass Term with Faddeevian Regularization
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ABSTRACT: In this talk, we consider the vector Schwinger model with a photon mass term with Faddeevian Regularization, describing two-dimensional (2D) electrodynamics with mass-less fermions and study its Hamiltonian and path integral quantization. This theory is seen to be gauge-non-invariant (GNI). We then construct a gauge-invariant (GI) theory corresponding to this GNI theory using the Stueckelberg mechanism and then recover the physical content of the original GNI theory from the newly constructed GI theory under some special gauge-fixing conditions.
Few-Body Systems 08/2015; 56(6). DOI:10.1007/s00601-015-1015-7