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Nuclear Theory·nucl-th

Wednesday·February 18, 2026

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 17 Feb 2026]

    Perturbative calculations of nucleon-deuteron elastic scattering in chiral effective field theory

    Lin Zuo🇨🇳 · Wendi Chen🇨🇳 · Dan-Yang Pang🇨🇳 · Bingwei Long🇨🇳

    We develop a framework for calculating nucleon-deuteron scattering using strict perturbation theory for treating subleading interactions in chiral effective field theory (ChEFT). Rather than using direct evaluations in the distorted-wave expansion, our approach solves a hierarchy of integral equations to obtain subleading scattering amplitudes. A benchmark with the wave packet continuum-discretization is performed. This framework benefits from the fact that the renormalization-group invariance chiral forces involves only a limited number of two-body partial waves at leading order. We use it to calculate nucleon-deuteron elastic scattering differential cross sections and analyzing powers up to next-to-leading order.

    Comments:
    23 pages and 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2602.15453 [pdf]
    CPC(2026)·1 citation
  2. 02

    [Submitted on 17 Feb 2026]

    Description of nucleon elastic scattering off Li with the four-body continuum-discretized coupled-channels method

    Kazuyuki Ogata · Shoya Ogawa

    Background: Neutron reactions off lithium isotopes up to 50 MeV are important for nuclear data science, around the International Fusion Material Irradiation Facility (IFMIF) facility in particular. Purpose: We aim at constructing a semi-microscopic reaction model that describes neutron elastic scattering off Li up to 50 MeV taking the breakup channels of Li into account. Methods: We adopt the continuum-discretized coupled-channels method (CDCC) with an three-body model of Li. We employ the -matrix effective interaction by Jeukenne, Lejeune, and Mahaux (JLM). The renormalization factors of the real and imaginary parts of the JLM interaction are treated as free parameters. Results: The renormalization parameter of the real part of the JLM interaction is found to be constant (), whereas that for the imaginary part has a smooth energy dependence. The four-body CDCC calculation with these parameters well describes the angular distributions of both proton and neutron elastic scatterings as well as the neutron total cross section and proton total reaction cross section. The applicable energy range is found to be from 7 MeV to 50 MeV. Conclusions: We have constructed a reliable reaction model for describing nucleon-Li scattering between 7 MeV and 50 MeV. This model can directly be applied to inelastic scattering and breakup reactions for Li with the help of the complex scaling method.

    Comments:
    7 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2602.15492 [pdf]
    0 citations
  3. 03

    [Submitted on 17 Feb 2026]

    Development of an accurate formalism to predict properties of two-neutron halo nuclei: case study of C

    Patrick McGlynn🇺🇸 · Chloë Hebborn🇺🇸

    When moving away from stability or in loosely-bound systems, few-body clusterized structures like two-neutron halo nuclei appear. These emerge from the interplay between the many- and few-body degrees of freedom, and/or strong coupling between bound and continuum states. This motivates the development of models that can accurately describe few-body dynamics while enforcing shell effects. This work has two goals: understanding how to accurately enforce the Pauli principle in few-body models, as well as presenting new technical developments that allow for more robust and cheaper three-body calculations. We focus on properties of the two-neutron halo 22C, but expect the conclusions to apply to other few-body systems. We use a three-body, hyperspherical harmonics formalism combined with the R-matrix method. We compare predictions for properties of 22C starting from phenomenological interactions and using two methods to remove Pauli-forbidden states, the projection and supersymmetric methods. We also present the algorithms and derivations used. Additionally, we explore model space truncations that allow for reduced computational time. We show convergence of the calculation of both bound and scattering states for . The two methods to enforce the Pauli-exclusion principle lead to different predictions of 22C properties; the projection method is more accurate. We find one efficient channel truncation that reduces the computational cost of our calculations by 20%. Our study clarifies that the projection method is more accurate than the supersymmetric one to enforce the Pauli-exclusion principle. Technical and algorithmic developments enable accurate and efficient computation of two-neutron halo properties. This development paves the way to robust uncertainty quantification in three-body predictions, and is a useful starting point to tackle more complex systems and observables.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2602.15765 [pdf]
    0 citations
  4. 04

    [Submitted on 17 Feb 2026]

    Radial oscillations of pulsating neutron stars: The UCIa equation-of-state case

    G. Panotopoulos · A. Övgün · T. Iqbal · Y. Kumaran · B. K. Sharma

    Radial oscillations provide a clean dynamical test of the high-density stiffness of neutron-star equations of state. We study spherically symmetric pulsations of nonrotating relativistic stars built from cold, charge-neutral, -equilibrated pure nucleonic matter described within relativistic mean-field theory. As a baseline we adopt the UCIa parameter set [Astron. Astro-phys. 689, A242 (2024)], and we implement high-density stiffening via the -cut scheme by adding a regulator potential [Phys. Rev. C 92, no.5, 052801 (2015), Phys. Rev. C 106, no.5, 055806 (2022)]. For representative choices (no cutoff) and (stiffened), we solve the Tolman-Oppenheimer-Volkoff and tidal perturbation equations to obtain equilibrium sequences, mass-radius relations, and tidal deformabilities. We then derive and solve the linear general-relativistic radial pulsation equations to compute the eigenfrequencies and eigenfunctions of the fundamental and overtone modes. The -cutoff suppresses the growth of the scalar field at supranuclear density, increases the pressure, and shifts the maximum mass, radii, and accordingly, while systematically raising the radial-mode frequencies at fixed mass. Using the sign change of as a stability criterion, we identify stiffened models that remain radially stable up to the observed mass scale and are consistent with current multimessenger constraints, demonstrating how radial spectra complement static EoS tests.

    Comments:
    Two-column revtex, 10 pages, 1 table, 8 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); General Relativity and Quantum Cosmology (gr-qc)
    arXiv:
    2602.15818 [pdf]
    1 citation

Affiliations

first authorsco-authorsvia INSPIRE