Bao, JD , BEIJING INST METEOROL,BEIJING 100081,PEOPLES R CHINA.
部门归属:
CCAST WORLD LAB,BEIJING 100080,PEOPLES R CHINA; INST ATOM ENERGY,BEIJING 102413,PEOPLES R CHINA; ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要:
We use a thermodynamic scheme (imaginary free energy method) in terms of the path integral technique to study the quantum decay rates of a metastable state system coupled to a heat bath in the crossover temperature (T-c) region. In this region the transition between thermally activated decay and tunneling occurs. A nonlinear coupling form factor is used to overcome the divergent integral in the partition function near T-c. The decay rate formula based on the steepest descent approximation has been improved. A method is developed to calculate the real and imaginary parts of the partition function which combines a random walk method with fast-Fourier transform Monte-Carlo evaluation. For a nonlinear dissipative system with a damping correlation kernel of exponential form, the accurate numerical calculations are presented. The effects of nonlinear and frequency-dependent damping on the rate are shown.
Bao, JD,Zhuo, YZ,Wu, XZ. Quantum decay rate of a nonlinear dissipative system with fission-like potential near T-c[J]. ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI,1996,354(3):293-299.
