Nuclear Theory·nucl-th

Wednesday·April 29, 2015

12 papers—6 primary·6 cross-listed

01
Hadronic Matter in the Robertson-Walker Metric and the Early Universe
Ivan E. Cunha🇧🇷 · Celso C. Barros Jr🇧🇷
In this work, the Friedman equations for hadronic matter in the Robertson-Walker metric in the early Universe are obtained. We consider the hadronic phase, formed after the hadronization of the quark-gluon plasma, that means times from 10^{-6}s to 1s. The set of equations is derived and the behavior of the system is studied considering one approximate analytical solution.
nucl-thastro-ph.COhep-thPhys.Part.Nucl.Lett.(2019)·1 citation
02
Magnetic moment, vorticity-spin coupling and parity-odd conductivity of chiral fermions in 4-dimensional Wigner functions
Jian-hua Gao🇨🇳 · Qun Wang🇨🇳
We demonstrate the emergence of the magnetic moment and spin-vorticity coupling of chiral fermions in 4-dimensional Wigner functions. In linear response theory with space-time varying electromagnetic fields, the parity-odd part of the electric conductivity can also be derived which reproduces results of the one-loop and the hard-thermal or hard-dense loop. All these properties show that the 4-dimensional Wigner functions capture comprehensive aspects of physics for chiral fermions in electromagnetic fields.
nucl-thPLB(2015)·31 citations
03
A Simple Efficient Method for Obtaining the Binding Energy of Lithium Nucleus under the Hulthén and Inversely Quadratic Yukawa Potentials
Nasrin. Salehi🇮🇷 · Mahsa. Ghazvini🇮🇷
In this paper, the binding energy of Lithium nucleus in a nonrelativistic model is obtained for the Hulthén and the Inversely Quadratic Yukawa Potential. In order to that, we used the concept of supersymmetry to solving the Schrödinger equation exact analytically. These potentials, due to their physical interpretations, are of interest within many areas of theoretical physics. The results of our model for all calculations show that the ground state binding energy of Lithium nucleus with these potentials are very close to the ones obtained in experiments.
nucl-th0 citations
04
Vibrational and rotational excited states within Bohr Hamiltonian with deformation-dependent mass formalism
M. Chabab · A. Lahbas · M. Oulne
In a recent work (Phys.Rev.C84, 044321, 2011) M.J. Ermamatov and P.R. Fraser have studied rotational and vibrational excited states of axially symmetric nuclei within the Bohr Hamiltonian with different mass parameters. However, the energy formula that the authors have used contains some inaccuracies. So, the numerical results they obtained seem to be controversial. In this paper, we revisit all calculations related to this problem and determine the appropriate formula for the energy spectrum. Moreover, in order to improve such calculations, we reconsider this problem within the framework of the deformation dependent mass formalism. Also, unlike the work of Bonatsos et al. (Phys.Rev.C83, 044321, 2011) where the mass parameter has not been considered, we will show the importance of this parameter and its effect on numerical predictions.
nucl-thPRC(2015)·37 citations
05
Further evidence for three-nucleon spin-orbit interaction in isotope shifts of $Z = magic$ nuclei
H. Nakada
It was pointed out [Phys. Rev. C \textbf{91}, 021302(R)] that the isotope shifts of the Pb nuclei, the kink at $N = 126$ in particular, can be well described by the Hartree-Fock-Bogolyubov calculations if a density-dependent LS interaction derived from the $3 N$ interaction is incorporated. Effects of the density-dependence in the LS channel on the isotope shifts are extensively investigated for the Ca, Ni and Sn isotopes, using the semi-realistic M3Y-P6 interaction and its LS modified variant M3Y-P6a, as in the Pb case. It is found that almost equal charge radii between $^{40}$ Ca and $^{48}$ Ca are reproduced, as well as the isotope shifts in a long chain of the Sn nuclei, owing to the density-dependence in the LS channel. A kink is predicted at $N = 82$ for the isotope shifts of the Sn nuclei, in clear contrast to the interactions without the density-dependence.
nucl-thPRC(2015)·40 citations
06
Role of $Λ (1670)$ in the $γ p \to K^{+} η Λ$ reaction near threshold
Li-Ye Xiao🇨🇳 · Qi-Fang Lü🇨🇳 · Ju-Jun Xie🇨🇳 · Xian-Hui Zhong🇨🇳
The role of the $Λ (1670)$ resonance in the $γ p \to K^{+} η Λ$ reaction near threshold is studied within an effective Lagrangian approach. We perform a calculation for the total and differential cross section of the $γ p \to K^{+} η Λ$ reaction by including the contributions from the $Λ (1670)$ intermediate state decaying into $η Λ$ dominated by $K^{-}$ and $K^{*-}$ mesons exchanges, the nucleon pole and $N^{*} (1535)$ resonance decaying into $K^{+} Λ$ dominated by exchanges of $ω$ and $K^{-}$ mesons. Besides, the non-resonance process and contact terms to keep the total scattering amplitude gauge invariant are also considered. With our model parameters, the total cross section of this reaction is of the order of $1$ nanobarn at photon beam energy $E_{γ} \sim 2.5$ GeV. It is expected that our model predictions could be tested by future experiments.
nucl-thhep-phnucl-exEPJA(2015)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

Hadronic Matter in the Robertson-Walker Metric and the Early Universe

Magnetic moment, vorticity-spin coupling and parity-odd conductivity of chiral fermions in 4-dimensional Wigner functions

A Simple Efficient Method for Obtaining the Binding Energy of Lithium Nucleus under the Hulthén and Inversely Quadratic Yukawa Potentials

Vibrational and rotational excited states within Bohr Hamiltonian with deformation-dependent mass formalism

Further evidence for three-nucleon spin-orbit interaction in isotope shifts of Z=magic nuclei

Role of Λ(1670) in the γp→K+ηΛ reaction near threshold

Affiliations

Further evidence for three-nucleon spin-orbit interaction in isotope shifts of $Z = magic$ nuclei

Role of $Λ (1670)$ in the $γ p \to K^{+} η Λ$ reaction near threshold