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Nuclear Theory·nucl-th

Wednesday·March 15, 2023

7 papers—6 primary·1 cross-listed

All7Primary6Cross-lists1
  1. 01

    Fluctuations of Strongly-interacting Matter in Thermal Models at Chemical Freeze-out

    Jamie M. Karthein🇺🇸

    Fluctuations provide a powerful tool for elucidating the nature of strongly-interacting matter in the QCD phase diagram. In heavy-ion-collision systems, the net-particle number fluctuations are captured at the moment of chemical freeze-out. Studies of the chemical freeze-out via susceptibilities from lattice QCD and the Hadron Resonance Gas model contribute to the characterization of the transition region of the QCD phase diagram. This contribution to proceedings will show how susceptibilities can be used to study the interplay between different conserved charges via cross-correlators and to constrain interactions in the hadron gas phase.

    nucl-thJ.Phys.Conf.Ser.(2023)·0 citations
  2. 02

    The improved saturation model in nuclei

    G.R.Boroun🇮🇷 · B.Rezaei🇮🇷

    We consider the nuclear shadowing in deep-inelastic scattering corresponding to kinematic regions accessible by future experiments at electron-ion colliders. The gluon distribution at small is obtained using an improved dipole model depended on the impact parameter for atomic nucleus and compared with nCETQ15 parametrization group. The nuclear shadowing at small is defined within the color dipole formalism with respect to the mass number . Its behavior is predicted for light nuclei in a wide range of the impact parameter and the transverse dipole size . The nuclear saturation at large- (small ) is observable. The behavior of the nuclear ratio is similar to the Golec-Biernat-Wsthoff (GBW) model in a wide range of for light and heavy nuclei at small .

    nucl-thhep-phPramana(2024)·7 citations
  3. 03

    Investigate the and polarization splitting effect with combined mechanisms

    Simin Wu🇨🇳 · Yilong Xie🇨🇳

    The significant splitting of and polarization measured in STAR's Au+Au 7.7GeV collisions seems to be huge and unable to be described satisfactorily by any single mechanism, thus we revisit and combine there different mechanisms together on the basis of our PICR hydrodynamic model, to explain the experimental data. The three mechanisms, i.e. the meson field mechanism, the freeze-out space-time mechanism, and the QGP's magnetic field mechanism, lie on different stage of high energy collisions, and thus are not contradicted with each other. We find that the meson field mechanism is dominat, while the QGP's magnetic field mechanism is rather trivial, and freeze-out time effect is restricted by the small FZ time difference, leading to a hierarchy of . Besides, the combination of different mechanisms could promote the mean value of polarization splitting from about 3\%-4\% to 4.5\%, which is more close to the experimental measured mean value of 5.8\%.

    nucl-thhep-phEPJA(2023)·4 citations
  4. 04

    Properties of hot finite nuclei and associated correlations with infinite nuclear matter

    Vishal Parmar · Manoj K Sharma · S K Patra

    This work aim to study the various thermal characteristics of nuclei in view of the saturation and critical behavior of infinite nuclear matter. The free energy of a nucleus is parametrized using the density and temperature-dependent liquid-drop model and interaction among nucleons is worked out within the effective relativistic mean-field theory (E-RMF). The effective mass (m,) and critical temperature of infinite symmetric nuclear matter () of a given E-RMF parameter force play a seminal role in the estimation of thermal properties. A larger (m) and of the E-RMF set estimate larger excitation energy, level density, and limiting temperature for a given nucleus. The limiting temperature of a nucleus also depends on the behavior of the nuclear gas surrounding the nucleus, making the equation of state (EoS) at subsaturation densities an important input. A stiff EoS in the subsaturation region estimates a higher pressure of the nuclear gas making it less stable. Since the plays an important part in these calculations, we perform a Pearson correlation statistical study of fifteen E-RMF parameter sets, satisfying the relevant constraint on EoS. Effective mass seems to govern the thermal characteristics of infinite as well as finite nuclear matter in the framework of E-RMF theory.

    nucl-thPRC(2022)·5 citations
  5. 05

    Thermal effects in hot and dilute homogeneous asymmetric nuclear matter

    Vishal Parmar🇮🇳 · Manoj K Sharma🇮🇳 · S K Patra🇮🇳

    We present a comprehensive analysis of hot and dilute isospin-asymmetric nuclear matter employing the temperature-dependent effective-relativistic mean-field theory (E-RMF). The E-RMF is applied to study the effect of and meson cross-coupling on the thermal properties of asymmetric nuclear matter using two recently developed IOPB-I and G3 parameter sets. These sets are known to reproduce the nuclear matter properties in agreement with various experimental and observational constraints. We consider the nuclear matter to be homogeneous and study the equation of state (EoS) for densities, temperature and asymmetry which are relevant for astrophysical simulations such as supernovae explosion. The effect of temperature is investigated in reference to the density-dependent free symmetry energy and its higher-order derivatives using the well known parabolic approximation. The larger value of cross-coupling in G3 in addition to the meson coupling in G3 smoothen the free symmetry energy. Thermal effects on various state variables are examined at fixed temperature and isospin asymmetry by separating their T=0 and the finite-T expressions. The thermal effects are mainly governed by effective mass with larger effective mass estimating larger thermal contribution. The effect of temperature on isothermal and isentropic incompressibility is discussed which is in harmony with various available microscopic calculations. The liquid-gas phase transition properties are examined in asymmetric matter with two conserved charges in the context of different slope parameter and comparable symmetry energy in IOPB-I and G3 set. The spinodal instability, binodal curve and critical properties are found to be influenced by the slope parameter .

    nucl-thPRC(2021)·10 citations
  6. 06

    Critical Properties of Symmetric Nuclear Matter in Low-Density Regime Using Effective-Relativistic Mean Field Formalism

    Vishal Parmar🇮🇳 · Manoj K Sharma🇮🇳 · S K Patra🇮🇳

    The effective field theory motivated relativistic mean-field (E-RMF) formalism is employed to study the equation of state (EoS) for the infinite symmetric nuclear matter at finite temperature using the recently developed forces FSUGarnet, IOPB-I, G3, and the well known NL3 force parameter. The EoS is then used to estimate the critical temperature , pressure and density of the symmetric nuclear matter for the liquid-gas phase transition. As is not a constrained parameter in both experiments and theoretical calculations, there is a large uncertainty around its value. Although, the critical parameters are correlated among themselves. It is revealed that vector self-coupling of used forces play determining role in EoS in finite temperature limit. Keeping the incompressibility in acceptable limit i.e. 240 20 MeV, the lower value of gives a better result of when compared to the several experimental data. The critical parameters however show weak correlation with the properties at saturation density at zero temperature. The compressibility factors calculated with these parameters are in agreement with the universal value of liquid-gas systems. Stability conditions are examined along with binodal and spinodal regions. Besides this, the thermodynamic properties like specific heat and latent heat are also worked out. We have carried out detailed consistency check of our calculations using critical exponents and standard scaling laws. All the exponents are well within the theoretical mean-field results.

    nucl-thJ.Phys.G(2021)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE