Nuclear Theory·nucl-th

Wednesday·December 9, 2015

4 papers—3 primary·1 cross-listed

01
QMC approach based on the Bogoliubov independent quark model of the nucleon
Henrik Bohr🇩🇰 · Steven A. Moszkowski🇺🇸 · Prafulla K. Panda🇮🇳 · Constanca Providencia🇵🇹 · Joao da Providencia🇵🇹
The quark-meson coupling model due to Guichon is formulated on the basis of the independent quark model of the nucleon proposed by Bogoliubov and is applied to the phenomenological descriptions of symmetric and asymmetric nuclear matter. For symmetric matter, the model predicts, at saturation density, the incompressibility $K = 335.17$ MeV, the quark effective mass $m_{q}^{*} = 238.5$ MeV, and the effective nucleon mass $M^{*} = 0.76 M,$ where $M$ is the nucleon mass in vacuum. Neutron star massesabove two solar masses are obtained.
nucl-thIJMPE(2016)·10 citations
02
Nuclear symmetry energy in a modified quark meson coupling model
R.N. Mishra🇮🇳 · H.S. Sahoo🇮🇳 · P.K. Panda🇮🇳 · N. Barik🇮🇳 · T. Frederico🇧🇷
We study nuclear symmetry energy and the thermodynamic instabilities of asymmetric nuclear matter in a self-consistent manner by using a modified quark-meson coupling model where the confining interaction for quarks inside a nucleon is represented by a phenomenologically averaged potential in an equally mixed scalar-vector harmonic form. The nucleon-nucleon interaction in nuclear matter is then realized by introducing additional quark couplings to $σ$ , $ω$ , and $ρ$ mesons through mean-field approximations. We find an analytic expression for the symmetry energy $E_{sy m}$ as a function of its slope $L$ . Our result establishes a linear correlation between $L$ and $E_{sy m}$ . We also analyze the constraint on neutron star radii in $(p n)$ matter with $β$ equilibrium.
nucl-thPRC(2015)·28 citations
03
Comment on "Structure of the two-neutrino double-\beta\ decay matrix elements within perturbation theory" by Dušan Štefánik, Fedor Šimkovic, Amand Faessler, arXiv:1506.00835 [nucl-th], Phys.Rev.C91 (2015) 6, 064311
Vadim Rodin · O.A. Rumyantsev · M.H. Urin
We comment on a priority claim given by the authors of Phys.Rev.C91 (2015) 6, 064311.
nucl-th0 citations
04
General spin and pseudospin symmetries of the Dirac equation
P. Alberto · M. Malheiro · T. Frederico · A. de Castro
In the 70's Smith and Tassie, and Bell and Ruegg independently found SU(2) symmetries of the Dirac equation with scalar and vector potentials. These symmetries, known as pseudospin and spin symmetries, have been extensively researched and applied to several physical systems. Twenty years after, in 1997, the pseudospin symmetry has been revealed by Ginocchio as a relativistic symmetry of the atomic nuclei when it is described by relativistic mean field hadronic models. The main feature of these symmetries is the suppression of the spin-orbit coupling either in the upper or lower components of the Dirac spinor, thereby turning the respective second-order equations into Schrödinger-like equations, i.e, without a matrix structure. In this paper we propose a generalization of these SU(2) symmetries for potentials in the Dirac equation with several Lorentz structures, which also allow for the suppression of the matrix structure of second-order equation equation of either the upper or lower components of the Dirac spinor. We derive the general properties of those potentials and list some possible candidates, which include the usual spin-pseudospin potentials, and also 2- and 1-dimensional potentials. An application for a particular physical system in two dimensions, electrons in graphene, is suggested.
↳ quant-phcond-mat.str-elnucl-thPRA(2015)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE

QMC approach based on the Bogoliubov independent quark model of the nucleon

Nuclear symmetry energy in a modified quark meson coupling model

Comment on "Structure of the two-neutrino double-\beta\ decay matrix elements within perturbation theory" by Dušan Štefánik, Fedor Šimkovic, Amand Faessler, arXiv:1506.00835 [nucl-th], Phys.Rev.C91 (2015) 6, 064311

General spin and pseudospin symmetries of the Dirac equation

Affiliations