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Nuclear Theory·nucl-th

Thursday·July 10, 2025

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    New approach for the quantification of uncertainties in reaction modeling via data-driven multi-objective optimization

    N. Dimitrakopoulos · G. Perdikakis · F. Montes · P. Gastis · S. A. Kuvin · H. Y. Lee · P. Tsintari · A. V. Voinov

    We introduce a new multi-objective optimization approach to determine uncertainty-quantified nuclear reaction parameters in the Hauser-Feshbach framework. By simultaneously accounting for all available data across multiple reaction channels we capture parameter correlations and estimate data-driven uncertainties. We implement in the Ni-Ge region yielding uncertainty-quantified model parameters for both stable and unstable isotopes. We estimate resonance spacings for nuclei beyond experimental reach and validate our method by calculating a known cross-section outside our optimization region.

    nucl-th1 citation
  2. 02

    Ferromagnetic instabilities in quarkyonic matter

    Bikai Gao🇯🇵 · Kenichi Yoshida🇯🇵

    We investigate the magnetic properties of quarkyonic matter, which naturally bridges nuclear and quark matter at intermediate densities relevant to neutron star cores. We extend the quarkyonic model to include spin polarization, where nucleons near the Fermi surface can be polarized while quarks in the deep Fermi sea remain unpolarized due to strong Pauli blocking. After including neutron interactions with spin-dependent terms, we find that quarkyonic matter can develop ferromagnetic instabilities at low densities, characterized by negative magnetic susceptibility. This ferromagnetic behavior occurs in pure neutron matter, independent of proton contributions, and results from the competition between attractive spin-dependent interactions and kinetic energy costs. The system returns to paramagnetic behavior at higher densities when Pauli pressure dominates. Our results demonstrate that the splitting of Fermi momenta of quarkyonic matter produces fundamentally different magnetic responses compared to conventional nuclear matter, with important implications for neutron star magnetism and magnetar physics.

    nucl-thPRC(2025)·5 citations
  3. 03

    Asymptotic behavior of the Speed of Sound in Dense Matter

    Udita Shukla🇵🇱 · Pok Man Lo🇵🇱

    We show that a class of NJL-like models fails to reproduce the expected conformal limit of the speed of sound, making them unsuitable for analyzing the equation of state of dense matter. We then demonstrate how this issue can be resolved within a simple dynamical quark model.

    nucl-thastro-ph.HEhep-phActa Phys.Polon.Supp.(2025)·3 citations
  4. 04

    Does HESS J1731-347 have a thick crust ?

    Sebastian Kubis · Włodzimierz Wójcik

    A relativistic mean-field model with a crossing term of isovector-scalar and isoscalar mesons, the Cracow crossing terms (CCT) model, has previously been shown to be capable of explaining the light and compact object HESS J1731-347. Here, the model is supplemented with a correct treatment of the phase transition. Applying the thermodynamically consistent Gibbs conditions shows that a mixed-phase system occurs in the core of the neutron star over a wide range of densities, extending up to the neutron star crust, leading to an intriguing stellar structure with a thick and massive crust.

    nucl-thastro-ph.HEastro-ph.SR2 citations

Affiliations

first authorsco-authorsvia INSPIRE