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Nuclear Theory·nucl-th

Thursday·January 14, 2021

13 papers—4 primary·9 cross-listed

All13Primary4Cross-lists9
  1. 01

    Unexpectedly enhanced -particle preformation in Ti probed by the reaction

    Yasutaka Taniguchi🇯🇵 · Kazuki Yoshida🇯🇵 · Yohei Chiba🇯🇵 · Yoshiko Kanada-En'yo🇯🇵 · Masaaki Kimura🇯🇵 · Kazuyuki Ogata🇯🇵

    The formation of particle on nuclear surface has been a fundamental problem since the early age of nuclear physics. It strongly affects the decay lifetime of heavy and superheavy elements, level scheme of light nuclei, and the synthesis of the elements in stars. However, the -particle formation in medium-mass nuclei has been poorly known despite its importance. Here, based on the reaction analysis, we report that the -particle formation in a medium-mass nucleus is much stronger than that expected from a mean-field approximation, and the estimated average distance between particle and the residue is as large as 4.5 fm. This new result poses a challenge of describing four nucleon correlations by microscopic nuclear models.

    nucl-thnucl-exPRC(2021)·21 citations
  2. 02

    Exploring effects of tensor force and its strength via neutron drops

    Zhiheng Wang · Tomoya Naito · Haozhao Liang · Wen Hui Long

    The tensor-force effects on the evolution of the spin-orbit splittings in the neutron drops are investigated within the framework of the relativistic Hartree-Fock theory. For fair comparisons on the pure mean-field level, the results of the relativistic Brueckner-Hartree-Fock calculation with the Bonn A interaction are adopted as meta-data. Through a quantitative analysis, we certify that the -pseudovector (-PV) coupling affects the evolutionary trend through the tensor force embedded. The strength of the tensor force is explored by enlarging the strength of the -PV coupling. It is found that weakening the density dependence of is slightly better than enlarging it with a factor. We thus provide a semiquantitative support for the \textit{renormalization persistency} of the tensor force within the framework of density functional theory. This will serve as an important guidance for the further development of the relativistic effective interactions with particular focus on the tensor force.

    nucl-thCPC(2021)·5 citations
  3. 03

    Impact of strong magnetic fields on the inner crust of neutron stars

    S. S. Bao🇨🇳 · J. N. Hu🇨🇳 · H. Shen🇨🇳

    We study the impact of strong magnetic fields on the pasta phases that are expected to exist in the inner crust of neutron stars. We employ the relativistic mean field model to describe the nucleon interaction and use the self-consistent Thomas-Fermi approximation to calculate the nonuniform matter in neutron star crust. The properties of pasta phases and crust-core transition are examined. It is found that as the magnetic field strength is less than G, the effects of magnetic field are not evident comparing with the results without magnetic field. As is stronger than G, the onset densities of pasta phases and crust-core transition density decrease significantly, and the density distributions of nucleons and electrons are also changed obviously.

    nucl-thPRC(2021)·10 citations
  4. 04

    Vorticity and Polarization in Heavy Ion Collisions: Hydrodynamic Models

    Iurii Karpenko🇨🇿

    Fluid dynamic approach is a workhorse for modelling collective dynamics in relativistic heavy-ion collisions. The approach has been successful in describing various features of the momentum distributions of hadrons produced in the heavy-ion collisions, such as spectra, flow coefficients etc. As such, the description of the phenomenon of polarization of hyperons in heavy-ion collisions has to be incorporated into the hydrodynamic approach. We start this chapter by introducing different definitions of vorticity in relativistic fluid dynamics. Then we present a derivation of the polarization of spin 1/2 fermions in the relativistic fluid. The latter is directly applied to compute the spin polarization of the hyperons, which are produced from the hot and dense medium, described with fluid dynamics. It is followed by a review of the existing calculations of global or local polarization of hyperons in different hydrodynamic models of relativistic heavy-ion collisions. We particularly focus on the explanations of the collision energy dependence of the global polarization from the different hydrodynamic models, the polarization component in the beam direction as well as on the origins of the global and local polarization.

    nucl-thnucl-ex14 citations

Affiliations

first authorsco-authorsvia INSPIRE