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Nuclear Theory·nucl-th

Thursday·December 7, 2023

13 papers—4 primary·9 cross-listed

All13Primary4Cross-lists9
  1. 01

    Numerical Convergence of Electromagnetic Responses with the Finite-Amplitude Method

    Tong Li · Nicolas Schunck

    The response of a nucleus to an electromagnetic probe is a key quantity to simulate photabsorption or photodeexcitation processes. For large calculations at the scale of the entire mass table, this response can be estimated by linear response theory. Thanks to the introduction of the finite-amplitude method (FAM), calculations are computationally efficient. In this paper, we investigate in more details the convergence of FAM calculations of the response function as a function of the parameters controlling the numerical implementation of the theory. We show that the response is much less sensitive to the details of the single-particle basis than, e.g., Hartree-Fock-Bogoliubov calculations.

    nucl-thEPJ Web Conf.(2024)·1 citation
  2. 02

    Speed of Sound in Magnetized Nuclear Matter

    Rajkumar Mondal🇮🇳 · Nilanjan Chaudhuri🇮🇳 · Pradip Roy🇮🇳 · Sourav Sarkar🇮🇳

    Employing the non-linear Walecka model we investigate the characteristics of nuclear matter under the influence of a background magnetic field at a finite temperature and baryon chemical potential. In the presence of the magnetic field the spinodal lines and the critical end point (CEP) undergo changes in the plane. The squared speed of sound exhibits anisotropic behavior, dividing into parallel and perpendicular components. Additionally, the presence of a magnetic field induces anisotropy in the isothermal compressibility. It is found that the parallel component is smaller than the perpendicular one for all values of temperature, chemical potential and magnetic field indicating that the equation of state is stiffer along the magnetic field direction.

    nucl-thhep-phPRC(2024)·10 citations
  3. 03

    Low-momentum relativistic nucleon-nucleon potentials I: Nuclear matter

    Chencan Wang🇨🇳 · Sibo Wang🇨🇳 · Hui Tong🇩🇪 · Jinniu Hu🇨🇳 · Jiangming Yao🇨🇳

    A series of relativistic one-boson-exchange potentials for two-nucleon system, denoted as OBEP, is constructed with a momentum cutoff ranging from to 2 fm. These potentials are developed by simultaneous fitting to nucleon-nucleon () scattering phase shifts, low-energy scattering length, effective range, and the binding energy of the deuteron. The momentum-space matrix elements of the low-momentum OBEP ( fm) demonstrate consistency with the universal behaviors observed in other realistic potentials evolved by renormalization group methods. These OBEPs are applied to calculate the equation of state of symmetric nuclear matter (SNM) within either the nonrelativistic (NR) Brueckner-Hartree-Fock (BHF) or relativistic Brueckner-Hartree-Fock (RBHF) frameworks. The results show that the saturation properties of SNM are reproduced qualitatively from the RBHF calculation, but not from the NR-BHF calculation. This study highlights the relativistic mechanism in explaining the saturation properties of nuclear matter. The remaining discrepancy in reproducing empirical saturation properties in the RBHF calculation using the OBEPs signals the necessity of including three-nucleon correlations or genuine three-nucleon forces.

    nucl-thPRC(2024)·7 citations
  4. 04

    Higher order dynamical charge fluctuations in heavy-ion collisions

    Bhanu Sharma🇮🇳 · P. K. Sahu🇮🇳

    The event-by-event charge fluctuation measurements are proposed to provide the signature of quark-gluon plasma (QGP) in heavy-ion collisions. Measure of dynamical charge fluctuations is expected to carry information of initial fractional charge of the QGP phase at the final state. We propose the higher order charge fluctuation measurement to study the QGP signal in heavy-ion collisions. This higher order charge fluctuation observable can amplify the signature of QGP. Also, the SMASH model is used to study the behavior of these observable in heavy-ion collisions at center of mass energies accessible in the STAR beam energy scan program.

    nucl-thhep-exhep-phnucl-ex1 citation

Affiliations

first authorsco-authorsvia INSPIRE