A Monte Carlo method for calculating strength functions in many-fermion systems |
| |
Authors: | SD Bloom SM Grimes RF Hausman |
| |
Institution: | Lawrence Livermore Laboratory, Department of Applied Science, University of California, Livermore, CA 94550, USA;Lawrence Livermore Laboratory, Livermore, CA 94550, USA;Los Alamos Scientific Laboratory, Los Alamos, NM 87545, USA |
| |
Abstract: | The calculation of moments is an essential first step in the calculation of strength functions for operators. A method for calculating approximate moments of a variety of operators in large vector spaces (dimension Ne) based on the use of sets of random multiparticle vectors (dimension Nd<Ne) is described and applied to the calculation of hamiltonian moments 〈Hn〉 in two nuclear cases: . The random vectors, which we call RRV's (random representative vectors), are constructed by statistically sampling a fraction f=Nd/Ne of the full space. Useful results are obtained with f?10?6(case of 28Si, Ne = 5.5 × 107). For Nd=Ne case of 21Ne, Ne=1935) our results for the dispersions of the sets of the moments closely approximate the predictions of Porter. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|