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ABSTRACT: In this work, we conduct a study on the properties of single-{\Lambda}
hypernuclei in the relativistic mean-field theory with the parameter set FSU,
where the isoscalar-isovector coupling has been included to soften the symmetry
energy. In our model, a tensor coupling between {\omega} and {\Lambda} is
employed, which is found to be essential in obtaining the small spin-orbit
interaction in single-{\Lambda} hypernuclei. Our calculated values of {\Lambda}
single-particle energies are in good agreement with the known experimental
data. As a comparison to other existing parameter sets, calculations are also
carried out by using parameterizaions such as NL3 and NL3*. The results show
that the parameter set FSU is as successful as those of NL3 and NL3* in terms
of reproducing the properties of single-{\Lambda} hypernuclei.
07/2012;
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ABSTRACT: The improved quark mass density- dependent model, which has been successfully
used to describe the properties of both finite nuclei and bulk nuclear matter,
is extended to include the strange quark. The parameters of the model are
determined by the saturation properties of bulk matter. Then the given
parameter set is employed to investigate both the properties of strange
hadronic matter and those of $\Lambda$ hypernuclei. Bulk strange hadronic
matter consisting of nucleons, $\Lambda$- hyperons and $\Xi$- hyperons is
studied under mean-field approximation. Among others, density dependence of the
effective baryon mass, saturation properties and stability of the physical
system are discussed. For single-$\Lambda$ hypernuclei, single particle
energies of $\Lambda$ hyperon is evaluated. In particular, it is found that the
present model produces a small spin-orbit interaction, which is in agreement
with the experimental observations. The above results show that the present
model can consistently describe the properties of strange hadronic matter, as
well as those of single $\Lambda$ hypernuclei within an uniform
parameterization.
06/2012;
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ABSTRACT: The improved quark mass density-dependent (IQMDD) model, which has been
successfully used to describe the properties of both infinite nuclear matter
and finite nuclei, is applied to investigate the properties of quark
deconfinement phase transition. By using the finite-temperature quantum field
theory, we calculate the finite temperature effective potential and extend the
IQMDD model to finite temperature and finite nuclear matter density. The
critical temperature and the critical density of nuclear matter are given and
the QCD phase diagram is addressed. It is shown that this model can not only
describe the saturation properties of nuclear matter, but also explain the
quark deconfinement phase transition successfully.
06/2012;
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ABSTRACT: We use a density-dependent relativistic mean field model to study the properties of nuclear systems at finite temperature. The liquid-gas phase transition of symmetric and asymmetric nuclear matter is discussed. A limiting pressure plim for hot asymmetric nuclear matter has been found because of the density dependence of the nucleon–nucleon–ρ meson coupling. It is found that the liquid-gas phase transition cannot take place if p>plim. The binodal surface for this model is addressed. In addition, we calculated the asymmetry parameter dependence of the critical temperature.
Phys. Rev. C. 04/2011; 83(4).
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ABSTRACT: Relativistic mean-field theory with parameter set FSUGold that includes the isoscalar-isovector cross interaction term is extended to study the properties of neutron star matter in β equilibrium by including hyperons. The influence of the attractive and repulsive Σ potential on the properties of neutron star matter and the maximum mass of neutron stars is examined. We also investigate the equations of state for pure neutron matter and for nonstrange hadronic matter for comparison. For a pure neutron star, the maximum mass is about 1.8Msun, while for a strange (nonstrange) hadronic star in β equilibrium, the maximum mass is around 1.35Msun (1.7Msun).
Phys. Rev. C. 02/2011; 83(2).
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ABSTRACT: The improved quark mass density-dependent model is applied to study the properties of finite nuclei. After fixing all the parameters by nuclear matter properties, we use this model to investigate the properties of doubly magic nuclei from 16O to 208Pb. In addition, it is the first time that relativistic mean field theory based on quark and meson degrees of freedom is applied to study the ground-state properties of the chain of isotope. The calculated binding energies, charge radii and separation energies agree with the available experimental data. It has been shown that our model can describe the properties of spherical finite nuclei successfully.
Journal of Physics G Nuclear and Particle Physics 08/2010; 37(10):105110. · 4.18 Impact Factor
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ABSTRACT: By using the finite-temperature quantum field theory, we calculate the finite-temperature effective potential and extend the improved quark mass density-dependent model to finite temperature. It is shown that this model can not only describe the saturation properties of the nuclear matter, but also explain the quark deconfinement phase transition successfully. The critical temperature is given and the effect of the ω-meson is addressed.
Journal of Physics G Nuclear and Particle Physics 09/2008; 35(12):125001. · 4.18 Impact Factor
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ABSTRACT: A new improved quark mass density-dependent model including u, d quarks, $\sigma$ mesons, $\omega$ mesons and $\rho$ mesons is presented. Employing this model, the properties of nuclear matter, neutron matter and neutron star are studied. We find that it can describe above properties successfully. The results given by the new improved quark mass density- dependent model and by the quark meson coupling model are compared. Comment: 18 pages, 7 figures
09/2008;
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ABSTRACT: An improved quark mass density- dependent model with the non-linear scalar sigma field and the $\omega$-meson field is presented. We show that the present model can describe saturation properties, the equation of state, the compressibility and the effective nuclear mass of nuclear matter under mean field approximation successfully. The comparison of the present model and the quark-meson coupling model is addressed.
07/2007;
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ABSTRACT: An improved quark mass density-dependent model that includes the coupling between the quarks and a nonlinear scalar field is presented. A numerical analysis of solutions of the model is performed over a wide range of parameters. The wave functions of the ground state and the lowest one-particle excited states with even and odd parities are given. The root-mean-squared radius, the magnetic moment, and the ratio between the axial-vector and the vector β-decay coupling constants of the nucleon are calculated. We found that the presented model is successful in describing the properties of the nucleon.
Phys. Rev. C. 09/2005; 72(3).
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ABSTRACT: The improved quark mass density- dependent model which includes the coupling between the quarks and a non-linear scalar field is presented. Numerical analysis of solutions of the model is performed over a wide range of parameters. The wave functions of ground state and the lowest one-particle excited states with even and odd parity are given. The root-mean squared radius, the magnetic moment and the ratio between the axial-vector and the vector beta-decay coupling constants of the nucleon are calculated. We found that the present model is successful to describe the properties of nucleon. Comment: 7pages, 6 figures
07/2005;
