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Nuclear Theory·nucl-th

Wednesday·January 8, 2025

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    Lattice Effective Field Theory Simulations of Nuclei

    Dean Lee🇺🇸

    Lattice effective field theory applies the principles of effective field theory in a lattice framework where space and time are discretized. Nucleons are placed on the lattice sites, and the interactions are tuned to replicate the observed features of the nuclear force. Monte Carlo simulations are then employed to predict the properties of nuclear few- and many-body systems. We review the basic methods and several theoretical and algorithmic advances that have been used to further our understanding of atomic nuclei.

    nucl-thhep-latnucl-exAnn.Rev.Nucl.Part.Sci.(2025)·38 citations
  2. 02

    New Skyrme parametrizations to describe finite nuclei and neutron star matter with realistic effective masses. II. Adjusting the spin-dependent terms

    Mingya Duan🇫🇷 · Michael Urban🇫🇷

    Many common Skyrme functionals present ferromagnetic instabilities or unrealistic density dependence of the spin-dependent Landau parameters. To solve these problems, we consider the Skyrme interaction as a density-functional rather than a density-dependent two-body force. This allows us to adjust the spin-dependent terms of the new extended Skyrme functionals of our previous paper [M. Duan and M. Urban, Phys. Rev. C 110, 065806 (2024)] independently without altering the properties of spin saturated matter. The parameters of the spin-dependent terms are determined by fitting the Landau parameters and in neutron matter and symmetric nuclear matter and the effective-mass splitting of up and down particles in spin polarized matter to the results of microscopic calculations. Using the new parametrizations, called Sky3s and Sky4s, the spin-related properties of nuclear matter are in good agreement with the microscopic results. As an application, we compute response functions and neutrino scattering rates of neutron-star matter with the new functionals having realistic effective masses and Landau parameters.

    nucl-thPRC(2025)·4 citations
  3. 03

    Determining the Duration of the Hadronic Stage at RHIC-BES Energies via Resonance Suppression Using a Full Set of Rate Equations

    Tim Neidig🇩🇪 · Apiwit Kittiratpattana🇩🇪 · Tom Reichert🇩🇪 · Amine Chabane🇩🇪 · Carsten Greiner🇩🇪 · Marcus Bleicher🇩🇪

    We present realistic estimates for the duration of the hadronic stage in central Au+Au reactions in the RHIC-BES energy regime. To this aim, we employ a full set of coupled rate equations to describe the time evolution of the system from chemical to kinetic freeze-out. Combined with the recently measured data by the STAR collaboration on ratios, we show that the previous estimates substantially underestimated the duration of this stage due to the omission of the regeneration of hadron resonances. We provide an improved relation between the ratio at chemical and kinetic freeze-out and the life time of the hadronic phase. The calculated improved life times are now in line with estimates from other methods and are relevant for the NA61 and STAR collaborations and for upcoming experiments at the FAIR facility.

    nucl-thhep-phPLB(2025)·5 citations
  4. 04

    Nuclear cross sections from low-energy interactions

    J. Boström · J. Rotureau · B. G. Carlsson · A. Idini

    We present a method to calculate neutron scattering cross sections for deformed nuclei using many--body wavefunctions described with multiple reference states. Nuclear states are calculated with the generator coordinate method using a low energy effective Hamiltonian. Using these states, a non--local and energy dependent optical potential is consistently constructed, allowing to directly investigate the role of nuclear structure properties in nuclear scattering. The case of neutron scattering on Mg is presented. The results are compared to experiment and to phenomenological optical potentials at energies below 13 MeV, demonstrating the importance of low--energy collectivity in elastic and non--elastic scattering.

    nucl-thPRC(2025)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE