Chen Guo-Jie

A Microwave Photonic Notch Filter Using a Microfiber Ring Resonator

A novel tunable microwave photonic filter based on a microfiber ring resonator is proposed and experimentally demonstrated. A fiber ring laser based on the microfiber ring resonator is employed to generate two single-longitudinal-mode carriers, then the dispersive element introduces the delay between two modulated carriers. By adjusting the diameter of the microfiber ring resonator, the proposed microwave photonic notch filter can be continuously and widely tuned. The measured notch rejection ratio is greater than 35 dB, and there is good agreement between the experimental result and the theoretical analysis.

Theoretical study on the rotational bands and shape coexistence of (179,) (181,183) Au in the particle-triaxial-rotor model

We perform a series of theoretical calculations and investigation for nuclei Au-179,Au-181,Au-183 in the particle-triaxial-rotor model with variable moment of inertia. The calculated energy spectra in Au-179,Au-181,Au-183 agree well with the experimental data globally. The obtained results indicate that the nuclei 179,181,183 An have prolate deformation and involve shape coexistence with different deformation parameters in different bands. The main configuration of bands 1, 2, 3 and 5 in these nuclei are identified as [541]1/2(-) (pi h(9/2), alpha = 1/2), [541]1/2(-) (pi h(9/2), alpha = -1/2), [530]1/2(-) (pi f(7/2)) and [660]1/2(+) (pi i(13/2)), respectively.

Theoretical Study on Negative Parity States of 191,193,195,197Au in Particle Triaxial-Rotor Model

By taking the particle triaxial-rotor model with variable moment of inertia, we investigate the energy spectra, the deformation and the single particle configuration of the negative-parity states in nuclei 191,193,195,197Au systemically. The calculated energy spectra agree well with experimental data. The obtained results indicate that the negative-parity states in 191,193,195,197Au originate from the proton-hole h11/2 configuration coupled to a triaxial oblate Hg core. Meanwhile the main single particle configuration of the bands 1, 2 and 3 are identified to be |5h11/21/2 (α = −1/2), |5h11/2 1/2 (α = 1/2) and |5h9/2 7/2, respectively.

Theoretical Calculation of Rotational Bands of 179Pt in the Particle–Triaxial–Rotor Model

Theoretical calculations have been performed for nucleus 179Pt in the particle–triaxial–rotor model with variable moment of inertia. The obtained energy spectrum agrees with the experimental data quite well. The calculated results indicate that the bands 1/2− and 7/2+ are triaxial deformation bands and originate mainly from the ν[521]1/2− and ν[633]7/2+ configurations respectively.