The diquark model is used to calculate the electromagnetic polarizabilities and charge radii of the nucleons for three different potentials. Making the scalar diquark lower in mass introduces a mixing angle θ between the |56〉 and |70〉 states ,which allows an improvement in value of all 6 properties. Generalizing the Gamov-Teller matrix and the magnetic moment operator to the diquark model gives...

We study low-energy virtual Compton scattering oo the proton within the framework of a nonrelativistic constituent quark model. The Compton ten-sor is divided into two separately gauge-invariant contributions. The rst consists of the groundstate propagation in the direct and crossed channels together with an appropriately chosen term to satisfy gauge invariance. The residual part contains the r...

The static dipole polarizability of atoms with up to Z 1⁄4 20 electrons has been determined by density functional theory using prototypical local, semi-local and non-local approximations for the exchange-correlation energy. These successive generations of approximations provide very similar results for d; suggesting that their success in predicting atomization energies of condensed systems is m...

Using a developed co-precipitation method, we synthesized spherical Fe3O4 nanoparticles with a wide nonlinear absorption band of visible radiation. Optical properties of the synthesized nanoparticles dispersed in an optically transparent copolymer of methyl methacrylate with styrene were studied by optical spectroscopy and z-scan techniques. We found that the electric polarizability of Fe3O4 na...

We report the observation of two dielectric transitions at 110 and 60 K in the microwave response of nonsuperconducting YBa2Cu3O6.0 crystals. The transitions are characterized by a change in polarizability and presence of loss peaks, associated with overdamped dielectric modes. An explanation is presented in terms of changes in polarizability of the apical O atoms in the Ba–O layer, affected by...

Molecular dynamics simulations are presented for condensed-phase electron transfer (ET) systems where the electronic polarizability of both the solvent and the solute is incorporated. The solute polarizability is allowed to change with electronic transition. The results display notable deviation from the standard free energy parabolas of traditional ET theories. A new three-parameter ET model i...