Realistic Calculations of Excitations in Nuclear Matter

Physics

Kwong, Nai-Hang ; Koonin, Steven E.

University:California Institute of Technology

Department:Physics, Mathematics and Astronomy

关键词: Physics;   

Others  :  https://thesis.library.caltech.edu/11828/2/Kwong_NH_1983.pdf

美国|英语

来源: Caltech THESIS

【 摘 要 】

A numerical method has been developed to solve the RPA equation, exchange term included, in nuclear matter. The dynamic form factor S(q, ω) is extracted for several v4 and v6 phenomenological potentials, including the d1-potential of Gogny et al. The limits of validity of the long-wavelength (Landau) approximation and the often adopted local-kernel approximation are discussed. Substantial disagreements with the exact results are found for the latter. The method is then applied to solve a Jastrow-correlated extension of the RPA equation, using the hardcore OMY potential. Results of calculations performed in two-body cluster approximation and Fermi-Hypernetted-Chain (FHNC) approximation are compared. The two-body results predict an instability against density fluctuations, which disappears at the FHNC level. The validity and consequences of employing the FHNC effective potential within the self-consistent HF/RPA framework are discussed. Future developments include applying the method to other Fermi systems such as liquid ³He and the microscopic calculation of Landau parameters.