PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·October 25, 2024

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    Effects of incompressibility on the neutron-proton equilibration in Zn + Zn collisions at 35 MeV/nucleon

    Erxi Xiao · Yu Yang · Yingge Huang · Zhen Zhang · Long Zhu · Jun Su

    Background: The primary goal of studying isospin dynamics via heavy-ion reactions is to explore the isospin dependence of effective interactions within the nuclear equation of state (EOS). Purpose: This work aims to investigate the effects of nuclear incompressibility () on neutron-proton equilibration in projectile-like fragments (PLFs). Method: We simulate Zn + Zn collisions at 35 MeV/nucleon using the isospin-dependent quantum molecular dynamics (IQMD) model, coupled with the statistical decay code GEMINI. Results: The IQMD simulations not only reproduce experimental data patterns but also reveal the dynamic mechanisms underlying the binary breakup of PLFs. The rotation of PLFs is influenced by the transformation of angular momentum, which is connected to the isoscalar component of the EOS. This connection explains why shifts in affect the description of neutron-proton equilibration as measured by PLF rotation. The simulations demonstrate that a model with a smaller paired with a softer symmetry energy, or a larger with a slightly stiffer symmetry energy, both offer better indications of neutron-proton equilibration. Conclusion: Considering the uncertainty in , the slope of the symmetry energy is constrained within the range of MeV, providing valuable insights into the nuclear equation of state.

    nucl-thnucl-exPRC(2025)·0 citations
  2. 02

    Impact of ground-state properties and collective excitations on the Skyrme ansatz: a Bayesian study

    Pietro Klausner🇮🇹 · Gianluca Colò🇮🇹 · Xavier Roca-Maza🇮🇹 · Enrico Vigezzi🇮🇹

    State-of-the-art models based on nuclear Density Functional Theory are successful in the description of nuclei throughout the whole nuclear chart. Among them, some differences arise regarding their accuracy. For a given nuclear model, this depends on the procedure adopted to determine the parameters, and, at the same time, new experimental findings constantly challenge theory. In the present work, we present a Bayesian inference study aimed at assessing the performance of the Skyrme Energy Density Functional. For the sake of simplicity and clarity, we restrict to spherical, double-magic nuclei, giving equal emphasis to ground-state and dynamical properties. Our basic constraints are: i) masses and charge radii, which are known to be very sensitive to the saturation energy and density; ii) spin-orbit splittings, which are associated with the spin-orbit parameter(s); iii) the electric dipole polarizability and parity-violating asymmetry, which are associated with the density dependence of the symmetry energy; iv) the excitation energy of the Isoscalar Giant Monopole Resonance, to constrain the nuclear matter incompressibility; v) the energy-weighted sum rule of the Isovector Giant Dipole Resonance, to account for the isovector effective mass; and vi) the excitation energy of the Isoscalar Quadrupole Resonance, that is related to the isoscalar effective mass. In this way, we test the Skyrme ansatz in a statistically meaningful way, by determining the posterior distributions of the parameters as well as their correlation, and discussing a possible strategy for future developments.

    nucl-thPRC(2025)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE