Nuclear Theory·nucl-th

Wednesday·November 19, 2025

13 papers—4 primary·9 cross-listed

01
[Submitted on 17 Nov 2025]
Formulation of fully covariant Quantum-Molecular Dynamics for an N-body system with scalar and vector potentials
Jiaxing Zhao🇩🇪 · Joerg Aichelin🇫🇷 · Elena Bratkovskaya🇩🇪
We present a fully covariant transport framework for Molecular Dynamics that enables a consistent description of the evolution of relativistic N-body systems. For the first time, we derive relativistic equations of motion incorporating both scalar and vector interactions within a manifestly covariant formulation. This approach addresses several fundamental issues in relativistic many-body dynamics: the implications of different choices of time-constraints, the emergence of the non-relativistic limit, the frame independence of the system's evolution, and the distinct dynamical roles of scalar and vector potentials. These aspects are investigated in detail for the scattering of two- and four-body systems, offering new insights into the consistency and physical interpretation of relativistic interactions in a covariant setting.
Comments:
40 pages, 12 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
arXiv:
2511.13975 [pdf]
1 citation
02
[Submitted on 18 Nov 2025]
Cluster phenomena using few-body and Lattice QCD theories
E. Hiyama🇯🇵 · T. Doi🇯🇵
With the advancement of first-principles calculations for baryon-baryon interactions, it becomes possible to obtain reliable hyperon-nucleon potentials by lattice QCD simulations with the HAL QCD method. High-precision few-body methods, such as the Gaussian Expansion Method (GEM), are applicable to solve quantum few-body systems up to four- and five-body systems. By combining the HAL QCD potentials with the GEM, one can predict the level structure of novel hypernuclei prior to experimental observation. In this review, we utilize the lattice QCD $N Ξ$ potential obtained by the HAL QCD method to investigate the few-body systems $N N Ξ$ and $N N N Ξ$ . Our analysis indicates that the lightest bound $Ξ$ hypernucleus is the $N N N Ξ$ system. To extract detailed information on the isospin and spin components of the $N Ξ$ interaction, we perform a four-body calculation for the $α α N Ξ$ system with the total isospin $T = 0$ and $T = 1$ . We demonstrate that the level structure of this system is sensitive to the isospin and spin dependencies of the $N Ξ$ interaction. Furthermore, we propose experimental investigations to produce the $N N N Ξ$ and $α α N Ξ$ systems via the $(K^{-}, K^{+})$ and $(K^{-}, K^{0})$ reactions on $^{4}$ He and $^{10}$ B targets, respectively.
Comments:
19 pages, 5 figures, accepted for publication in Eur. Phys. J. A
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2511.14155 [pdf]
EPJA(2025)·2 citations
03
[Submitted on 18 Nov 2025]
Deviations from the Isobaric Multiplet Mass Equation due to threshold states
R. J. Charity🇺🇸 · J. Okołowicz🇫🇷 · M. Płoszajczak🇫🇷 · L.G. Sobotka🇺🇸 · K.W. Brown🇺🇸
Recent studies have completed the A=16 isospin quintets for states with spin/parity J{\pi} =0+ and 2+. The dependence of their masses as a function of isospin projection shows evidence for deviations from quadratic behavior indicating isospin violation beyond the expectation from two- body forces. The deviation is most pronounced for the 2+ states. Predictions from the Shell Model Embedded in the Continuum (SMEC) allow us to explain that this isospin violation is associated with a modification of the nuclear structure due to the open-quantum-system nature of the proton- rich members of the quintet. In particular, the 0+ and 2+ states in 16Ne and the 2+ state in 16F are threshold resonances located just above a proton-decay threshold where s-wave coupling to the continuum is expected. The measured deviations of these threshold states from the quadratic behavior of the remaining members of the multiplets makes it possible to obtain information on the magnitude and the energy dependence of the continuum-coupling energy correction. Continuum coupling is also indicated for the ground state of 8C, but this time through p-wave coupling.
Comments:
7 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2511.14674 [pdf]
PRL(2025)·2 citations
04
[Submitted on 18 Nov 2025]
Systematic Study on the $α$ -particle preformation factor in the theory of $α$ -decay based on the Tabular Prior-data Fitted Network (TabPFN)
Panpan Qi · Xuanpeng Xiao · Gongming Yu · Haitao Yang · Qiang Hu
A hybrid approach combining the Tabular Prior-data Fitted Network (TabPFN) with the Coulomb and Proximity Potential Model (CPPM) is developed to investigate $α$ -particle preformation factors $P_{α}$ and their impact on $α$ -decay half-lives. The TabPFN model, trained on 498 nuclei, accurately learns the relationship between nuclear structure properties and $P_{α}$ , achieving a root mean square deviation of $σ_{rms} = 0.211$ . The predicted factors reveal clear odd-even staggering and shell closure effects, and exhibit linear correlations with both $Q_{α}^{- 1/2}$ and the fragmentation potential $V_{frag}$ . When incorporated into CPPM calculations, the machine-learning-based $P_{α}$ values significantly improve half-life predictions. Similar improvements are also obtained when deformation effects are included in the potential barrier description. The capability of the model is further demonstrated through predictions for superheavy nuclei ( $Z = 117$ --120), suggesting $N = 184$ as a potential neutron magic number.
Comments:
13 pages, 7 figures, 4 tables
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2511.14705 [pdf]
PRC(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Formulation of fully covariant Quantum-Molecular Dynamics for an N-body system with scalar and vector potentials

Cluster phenomena using few-body and Lattice QCD theories

Deviations from the Isobaric Multiplet Mass Equation due to threshold states

Systematic Study on the α-particle preformation factor in the theory of α-decay based on the Tabular Prior-data Fitted Network (TabPFN)

Affiliations

Systematic Study on the $α$ -particle preformation factor in the theory of $α$ -decay based on the Tabular Prior-data Fitted Network (TabPFN)