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Nuclear Theory·nucl-th

Thursday·January 22, 2026

13 papers—5 primary·8 cross-listed

All13Primary5Cross-lists8
  1. 01

    [Submitted on 21 Jan 2026]

    Possible Existence of H, H, He, and He Nuclei

    Rimantas Lazauskas🇫🇷 · Roman Ya. Kezerashvili🇺🇸 · Igor Filikhin🇺🇸

    Motivated by recent HAL QCD simulations of the interaction in the channel and its modification in the channel, we develop a first-principles few-body framework that embeds these potentials into configuration-space Faddeev--Yakubovsky equations. We predict bound , , and nuclei by performing calculations for -mesic and systems. Both spin-dependent and spin-independent interactions are considered, leading to deeply and moderately bound states, respectively. The deeply bound states originate from the strong attraction in the channel. Coulomb shifts of the binding energies are evaluated. Our findings provide the binding mechanism and demonstrate the importance of short-range attraction.

    Comments:
    6 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
    arXiv:
    2601.14572 [pdf]
    PLB(2026)·1 citation
  2. 02

    [Submitted on 21 Jan 2026]

    How Threshold Effects in Spectroscopic Factors Influence Heavy-Ion Knockout Reactions

    M. R. Xie · J.G. Li · C. A. Bertulani · N. Michel · Y. Z. Sun · W. Zuo

    A two-decade-old puzzle in heavy-ion one-nucleon knockout reactions is the strong correlation between the reduction factor and the Fermi surface asymmetry . Theoretical cross sections typically rely on spectroscopic factors (SFs) from shell model (SM) calculations, which neglect continuum coupling effects. Here, we employ the Gamow shell model (GSM), which explicitly incorporates continuum coupling, to compute SFs for -shell nuclei and predict corresponding theoretical cross sections. Systematic calculations demonstrate that using GSM-derived SFs substantially reduces discrepancies between theoretical and experimental results. This improvement is particularly significant for deeply bound nucleon knockout in nuclei near the dripline, where traditional SM-based calculations fall short. As a result, using GSM SFs, the ratio exhibits no pronounced dependence on . Furthermore, both the ratio of GSM SFs to SM SFs and their corresponding reaction cross sections ratios exhibit a strong dependence. We have also compared GSM SFs and cross sections with those from the no-core shell model calculations, giving a similar pronounced sensitivity to . Detailed analysis attributes these correlations to threshold effects for SFs in weakly bound systems. Overall, incorporating continuum coupling via GSM enhances the reliability of SF predictions for exotic, weakly bound nuclei and provides key insights toward resolving the enduring puzzle in heavy-ion knockout reactions from a nuclear structure perspective.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2601.14596 [pdf]
    PLB(2026)·1 citation
  3. 03

    [Submitted on 21 Jan 2026]

    \textit{Ab initio} study of spectroscopic factors in K and neighboring isotones

    P. Y. Wang · M. R. Xie · Q. Yuan · W. J. Huang · J. G. Li

    A recent \(^{47}\text{K}(d,p\gamma)^{48}\text{K}\) transfer reaction measurement has identified new excited states in \(^{48}\text{K}\) and extracted the corresponding spectroscopic factors (SFs)[\href{https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.162504}{C. J. Paxman, \textit{et al.} PhysRevLett.134.162504 (2025)}], but they exposed sizeable discrepancies with large-scale shell-model (LSSM) calculations-especially for the low-lying states-suggesting shortcomings in the proton-neutron interaction employed by the LSSM. In this work, we revisit the low-lying states and SFs of \(^{48}\text{K}\) using the \textit{ab initio} valence-space in-medium similarity renormalization group (VS-IMSRG) approach based on the chiral two- and three-nucleon forces. The calculated excitation energies reproduce the experimental data for \(^{48}\text{K}\), whereas computed SFs systematically exceed experimental values. We trace this overestimation to missing reduction factors that account for non-idealities of the transfer reaction. After introducing a phenomenological reduction factor, our VS-IMSRG results and the LSSM calculations achieve agreement with experiment. We also perform the same analysis for the neutron SFs of Ar. Furthermore, we extend the \textit{ab initio} calculations across the isotones, computing excitation energies and single-neutron transfer SFs from isotones ranging from K to S. By systematically removing protons from \(^{48}\text{K}\) to \(^{45}\text{S}\), we trace the evolution of the \(N=28\) shell strength via theoretical SFs values. Our results provide a microscopic pathway to quantify the weakening of the \(N=28\) shell closure.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2601.14604 [pdf]
    PRC(2026)·0 citations
  4. 04

    [Submitted on 21 Jan 2026]

    dibaryon and its cousins from SU(6)-constrained baryon-baryon interaction

    Tao-Ran Hu🇨🇳 · Feng-Kun Guo🇨🇳

    We constrain the -wave baryon-baryon interaction using SU(6) symmetry within a nonrelativistic effective field theory. The most general leading-order Lagrangian contains two independent parameters, which we determine using physical and lattice QCD scattering lengths. This framework allows for parameter-free predictions in the strangeness sector relevant to the dibaryon. Solving the coupled-channel scattering problem, we identify two bound states below the threshold, one deeply bound and one shallow, along with resonances near the and thresholds. We demonstrate that these poles result in distinct enhancements in invariant mass distributions, suggesting that the dibaryon exists as a multichannel bound state and providing clear signatures for experimental verification.

    Comments:
    7 pages, 3 figures, 3 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2601.14922 [pdf]
    2 citations
  5. 05

    [Submitted on 21 Jan 2026]

    Decomposition of angular momentum projected nuclear wave function

    Wen Chen · Zhan-Jiang Lian · Xue-Wei Li · Xin-Yang Xia · Zi-Yang He · Ke-Zheng Ruan · Zao-Chun Gao

    Angular momentum projection is a basic technique in constructing nuclear wave functions with good spins. Traditionally, a projected nuclear wave function is expressed in terms of the bases built by performing the angular momentum projection directly on reference states for the whole nuclear system. Alternatively, one can construct nuclear wave function with another kind of projected bases, called as the coupled projected bases, which are generated by first performing the angular momentum projections on the reference states for neutrons and protons, respectively, then coupling the neutron projected states with the proton ones via Clebsch-Gordon coefficients. In the present work, we derive a new identity, which provides a decomposition of the conventional angular momentum projected nuclear wave function in terms of the coupled projected bases. This decomposition offers direct insight into the underlying structure of nuclear states. To show this point, we present the decompositions of variation after projection shell model (VAPSM) wave functions for the ground states in some shell nuclei. It is interesting to see that even for the ground states in even-even nuclei, the nucleons are not fully paired. Finally, we demonstrate that the VAPSM wave function can be further improved by adopting the coupled projected bases.

    Comments:
    11 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2601.15002 [pdf]
    CPC(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE