Nuclear binding energies,charge radii and the charge distributions of even-even tin (Sn) isotopes are calculated using relativistic mean field theory,and the theoretical results are found to be in accordance with the experimental data.The nuclear charge form factors for Sn isotopes are calculated using the phase-shift analysis method.It is shown that the minima of the charge form factors shift upward and inward with an increase in the neutron number of the Sn isotopes.
A new version of the generalized density-dependent cluster model (GDDCM) is de-veloped to describe an α particle tunneling through a deformed potential barrier.The microscopic deformed potential is numerically constructed in the double-folding model using the multipole ex-pansion method.The decay width of an α-cluster state is evaluated using the integral of the quasi-bound state wave function,the scattering state wave function,and the difference of poten-tials.We perform a systematic calculation of α-decay half-lives for favored transitions in even-even nuclei ranging from Z=52 to Z=104.The calculated half-lives are in good agreement with the experimental values.The relation between nuclear deformations and α-decay half-lives is also discussed in details.
The entanglement dynamics of system, where atoms A and B interact with single mode cavity fields a and b respectively, is studied. The interaction between atom A and cavity a may be described by using the typical JaynesCummings model, while that between the atom B and cavity b filled with a Kerr medium is of a two-photon process. For a certain initial atom entanglement state, there is an entanglement sudden death e?ect between the two atoms. The Kerr medium in the cavity b can e?ectively prevent the undesirable entanglement sudden death from occurring. Also, from the viewpoint of the population dynamics, we discuss why the Kerr medium can do so.
This paper investigates the entanglement dynamics of the system,composed of two qubits A and B with Heisenberg XX spin interactation.There is a third controller qubit C,which only has Dzyaloshinskii-Moriya (DM) spin-orbit interaction with the qubit B.It is found that depending on the initial state of the controller qubit C and DM interaction,the entanglement of the system displays amplification and sudden birth effects.These effects indicate that one can control the entanglement of the system,which may be helpful for quantum information processing.
In this work, the ground-state properties of Pt, Hg, Pb, and Po isotopes have been systematically investigated in the deformed relativistic mean field (RMF) theory with the new parameter set FSUGold. The calculated results show that FSUGold is as successful as NL3 in reproducing the ground-state binding energies of the nuclei in this region. The calculated twoneutron separation energies, quadrupole deformations, and root-mean-square charge radii are in agreement with the experimental data. The parameter set FSUGold can successfully describe the shell effect of the neutron magic number N = 126 and give smaller neutron skin thicknesses than NL3 for all the nuclei considered.
