Nuclear Theory·nucl-th

Wednesday·November 13, 2024

8 papers—6 primary·2 cross-listed

01
Heavy quark potential and thermal charm production in heavy-ion collisions
Taesoo Song🇩🇪 · Jiaxing Zhao🇩🇪 · Ilia Grishmanovskii🇩🇪
Heavy quark mass in QGP is related to the heavy quark potential at a large distance. In this study we test three different heavy quark potentials, namely, the free energy, the internal energy of the heavy quark pair in QGP, and the unscreened potential, which was recently proposed by the HotQCD Collaboration, through the thermal production of charm quarks in heavy-ion collisions at the LHC. We find that the free energy potential overestimates charm production in heavy-ion collisions at the LHC, while the unscreened potential produces results closest to the experimental data from the ALICE Collaboration among the three potentials.
nucl-thhep-phEPJA(2026)·3 citations
02
Ab initio informed 20Ne(p, p $α$ )16O reaction elucidates the emergence of alpha clustering from chiral potentials
G. H. Sargsyan · Kazuki Yoshida · Kazuyuki Ogata · K. D. Launey · J. E. Escher · D. Langr · T. Dytrych
We report on the first \textit{ab initio} informed $α$ knock-out reaction in the intermediate-mass region, with the aim to probe the underlying chiral potential and its impact on the emergence of alpha clustering in this mass region. The theoretical predictions of the $α +^{16}$ O clustering in the $^{20}$ Ne ground state, based on the \textit{ab initio} symmetry-adapted no-core shell model, yield a triple differential cross section for $^{20}$ Ne(p, p $α$ ) $^{16}$ O that is in a remarkable agreement with the data. This allows us to examine predictions of surface and in-medium $α$ -cluster features from a chiral potential and to compare these to the successful antisymmetrized molecular dynamics approach.
nucl-thPLB(2025)·9 citations
03
Nonlocal interaction and collective excitation in deuteron breakup on $^{24}$ Mg nucleus
A. Deltuva · D. Jurčiukonis
Deuteron breakup in collision with a $^{24} Mg$ nucleus is studied using rigorous three-body scattering equations, extended to include also the excitation of the nucleus. Predictions based on local and nonlocal nucleon-nucleus optical potentials with rotational quadrupole deformation enabling the excitation of the $^{24} Mg (2^{+})$ state are compared. The nonlocality effect is less pronounced than in the deuteron inelastic scattering $^{24} Mg (d, d^{'})$ at the same energies, and manifests itself quite differently for semi-inclusive differential cross sections of elastic and inelastic breakup.
nucl-thnucl-exPRC(2024)·1 citation
04
Berry Curvature and Spin-One Color Superconductivity
Noriyuki Sogabe🇺🇸 · Yi Yin🇨🇳
We explore the interplay between Berry curvature and topological properties in single-flavor color superconductors, where quarks form spin-one Cooper pairs. By deriving a new relation, we connect the topological nodal structure of the gap function in momentum space to the (nonabelian) Berry flux associated with paired quarks. This generalizes the early work by Li and Haldane [Phys. Rev. Lett. 120, 067003 (2018)] to systems with additional internal quantum numbers, such as color. In the ultrarelativistic limit, we uncover rich topological structures driven by the interplay of spin, chirality, and color. Specifically, we identify chirality-induced topological nodes in the transverse (opposite chirality pairing) polar and A phases. In contrast, the color-spin-locking phase lacks these nodes due to a nontrivial color Berry flux, which in turn induces gapless excitations with total Berry monopole charges of $\pm 3/2 -$ differing from conventional Weyl fermions. Our findings can be potentially extended to other fermionic systems carrying additional internal degrees of freedom.
nucl-thcond-mat.str-elcond-mat.supr-conhep-ph+1PRL(2025)·5 citations
05
Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: IV. Improved description of the isospin dependence of pairing
Guilherme Grams · Nikolai N. Shchechilin · Adrian Sanchez-Fernandez · Wouter Ryssens · Nicolas Chamel · Stephane Goriely
Providing reliable data on the properties of atomic nuclei and infinite nuclear matter to astrophysical applications remains extremely challenging, especially when treating both properties coherently within the same framework. Methods based on energy density functionals (EDFs) enable manageable calculations of nuclear structure throughout the entire nuclear chart and of the properties of infinite nuclear matter across a wide range of densities and asymmetries. To address these challenges, we present BSkG4, the latest Brussels-Skyrme-on-a-Grid model. It is based on an EDF of the extended Skyrme type with terms that are both momentum and density-dependent, and refines the treatment of $^{1} S_{0}$ nucleon pairing gaps in asymmetric nuclear matter as inspired by more advanced many-body calculations. The newest model maintains the accuracy of earlier BSkGs for known atomic masses, radii and fission barriers with rms deviations of 0.633 MeV w.r.t. 2457 atomic masses, 0.0246 fm w.r.t. 810 charge radii, and 0.36 MeV w.r.t 45 primary fission barriers of actinides. It also improves some specific pairing-related properties, such as the $^{1} S_{0}$ pairing gaps in asymmetric nuclear matter, neutron separation energies, $Q_{β}$ values, and moments of inertia of finite nuclei. This improvement is particularly relevant for describing the $r$ -process nucleosynthesis as well as various astrophysical phenomena related to the rotational evolution of neutron stars, their oscillations, and their cooling.
nucl-thastro-ph.HEEPJA(2025)·14 citations
06
How neutron star properties disfavor a nuclear chiral density wave
Orestis Papadopoulos🇬🇧 · Andreas Schmitt🇬🇧
Cold and dense matter may break rotational symmetry spontaneously and thus form an anisotropic phase in the interior of neutron stars. We consider the concrete example of an anisotropic chiral condensate in the form of a chiral density wave. Employing a nucleon-meson model and taking into account fermionic vacuum fluctuations, we improve and extend previous results by imposing the conditions of electric charge neutrality and electroweak equilibrium, by allowing for a more general form of the vector meson self-interactions, and by including properties of pure neutron matter into the fit of the model parameters. We find that the conditions inside neutron stars postpone the onset of the chiral density wave to larger densities compared to isospin-symmetric nuclear matter. While this still allows for the construction of stars with an anisotropic core, we find that the chiral density wave is energetically preferred only in a corner of the parameter space where matter is too soft to generate stars with realistic masses. Therefore, taking into account constraints from astrophysical data, our calculation predicts an isotropic neutron star core.
nucl-thastro-ph.HEhep-phPRD(2025)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE

Heavy quark potential and thermal charm production in heavy-ion collisions

Ab initio informed 20Ne(p, pα)16O reaction elucidates the emergence of alpha clustering from chiral potentials

Nonlocal interaction and collective excitation in deuteron breakup on 24Mg nucleus

Berry Curvature and Spin-One Color Superconductivity

Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: IV. Improved description of the isospin dependence of pairing

How neutron star properties disfavor a nuclear chiral density wave

Affiliations

Ab initio informed 20Ne(p, p $α$ )16O reaction elucidates the emergence of alpha clustering from chiral potentials

Nonlocal interaction and collective excitation in deuteron breakup on $^{24}$ Mg nucleus