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Nuclear Theory·nucl-th

Tuesday·June 8, 2021

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    Ladder resummation of spin 1/2 fermion many-body systems with arbitrary partial-wave content

    J. M. Alarcón🇪🇸 · J. A. Oller🇪🇸

    We resum the ladder diagrams for the calculation of the energy density of a spin 1/2 fermion many-body system in terms of arbitrary vacuum two-body scattering amplitudes. The partial-wave decomposition of the in-medium two-body scattering amplitudes is developed, and the expression for calculating in a partial-wave amplitude expansion is also given. The case of contact interactions is completely solved and is shown to provide renormalized results, expressed directly in terms of scattering data parameters, within cutoff regularization in a wide class of schemes. - and -wave interactions are considered up to including the first three-terms in the effective-range expansion, paying special attention to the parametric region around the unitary limit.

    nucl-thcond-mat.quant-gashep-phAnnals Phys.(2022)·10 citations
  2. 02

    Systematic study of surface properties for Ne, Na, Mg, Al and Si isotopes in a coherent density fluctuation model using the relativistic mean field formalism

    Jeet Amrit Pattnaik · R. N. Panda · M. Bhuyan · S. K. Patra

    We have systematically studied the surface properties, such as symmetric energy, neutron pressure, and symmetry energy curvature coefficient for Ne, Na, Mg, Al, and Si nuclei from the proton to neutron drip-lines. The Coherent Density Fluctuation Model (CDFM) is used to estimate these quantities taking the relativistic mean-field densities as inputs. The Brückner energy density functional is taken for the nuclear matter binding energy and local density approximation is applied for its conversion to coordinate space. The symmetry energy again decomposed to the volume and surface components within the liquid drop model formalism to the volume and surface parts separately. Before calculating the surface properties of finite nuclei, the calculated bulk properties are compared with the experimental data, whenever available. The NL3* parameter set with the BCS pairing approach in an axially deformed frame-work is used to take care of the pairing correlation when needed. The deformed density is converted to its spherical equivalent with a two Gaussian fitting, which is used as an input for the calculation of weight function in the CDFM approximation. With the help of the symmetric energy for the recently isotopes F, Ne, Na and Mg are considered to be within the {\it island of inversion} emphasized {\bf [Phys. Lett. B 772, 529 (2017)]}. Although we get large symmetric energies corresponding to a few neutron numbers for this isotopic chain as expected, an irregular trend appears for all these considered nuclei. The possible reason behind this abnormal behavior of symmetry energy for these lighter mass nuclei is also included in the discussion, which gives a direction for future analysis.

    nucl-thCan.J.Phys.(2022)·9 citations
  3. 03

    Effects of three-baryon forces on kaon condensation in hyperon-mixed matter

    Takumi Muto🇯🇵 · Toshiki Maruyama🇯🇵 · Toshitaka Tatsumi🇯🇵

    Possibility of kaon-condensed phase in hyperon-mixed matter is considered on the basis of chiral symmetry for kaon-baryon and kaon-kaon interactions, being combined with the relativistic mean-field theory for two-body baryon interaction. In addition, universal three-baryon repulsive force in the string-junction model and phenomenological three-nucleon attractive force are introduced. It is shown that softening of the equation of state stemming from both kaon condensation and mixing of hyperons is compensated with the repulsive effect of the three-baryon force and the relativistic effect for two-body baryon-baryon interaction. The latter effect reflects the density-dependence of scalar and vector meson mean-fields, which is constrained by the contribution of the attractive three-nucleon force to the binding energy at saturation density. The kaon-condensed phase in hyperon-mixed matter becomes stiff enough to be consistent with recent observations of massive neutron stars.

    nucl-thastro-ph.HEPLB(2021)·24 citations
  4. 04

    Systematic study of the Chiral Magnetic Effect with the AVFD model at LHC energies

    Panos Christakoglou🇳🇱 · Shi Qiu🇳🇱 · Joey Staa🇳🇱

    We present a systematic study of the correlators used experimentally to probe the Chiral Magnetic Effect (CME) using the Anomalous Viscous Fluid Dynamics (AVFD) model in Pb--Pb and Xe--Xe collisions at LHC energies. We find a parametrization that describes the dependence of these correlators on the value of the axial current density (), which dictates the CME signal, and on the parameter that governs the background in these measurements i.e., the percentage of local charge conservation (LCC) within an event. This allows to deduce the values of and the LCC percentage that provide a quantitative description of the centrality dependence of the experimental measurements. We find that the results in Xe--Xe collisions at ~TeV are consistent with a background only scenario. On the other hand, the model needs a significant non-zero value of to match the measurements in Pb--Pb collisions at ~TeV.

    nucl-thnucl-exEPJC(2021)·17 citations
  5. 05

    Crust-core transition of a neutron star: effect of the temperature under strong magnetic fields

    Márcio Ferreira🇵🇹 · Aziz Rabhi🇵🇹 · Constança Providência🇵🇹

    The effect of temperature on the crust-core transition of a magnetar is studied. The thermodynamical spinodals are used to calculate the transition region within a relativistic mean-field approach for the equation of state. Magnetic fields with intensities G and G are considered. It is shown that the effect on the extension of the crust-core transition is washed away for temperatures above K for magnetic field intensities G but may still persist if a magnetic field as high as G is considered. For temperatures below that value, the effect of the magnetic field on crust-core transition is noticeable and grows as the temperature decreases and, in particular, it is interesting to identify the existence of disconnected non-homogeneous matter above the crust core transition density. Models with different symmetry energy slopes at saturation show quite different behaviors. In particular, a model with a large slope, as suggested by the recent results of PREX-2, predicts the existence of up to four disconnected regions of non-homogeneous matter above the zero magnetic field crust-core transition density.

    nucl-thastro-ph.HEhep-phEPJA(2021)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE