دراسة التركيب النووي للنوى الخفيفة (6Li , 9Be)

Nuclear Structure Study for Light Nuclei 6Li , 9Be

Abstract

The large basis no-core model has been applied in 6Li and 9Be nuclei, to study the structure and some electromagnetic properties of these nuclei. The shell model calculation included two models-space psd and spsdpf with psdmwk and wbm interactions respectively.
According to the psd and spsdpf model space, the one-body density matrix element was calculated and used to check the elastic and inelastic form factors and energy levels for the low-lying excited state of these nuclei. The single-particle radial wave function adopted Wood-Saxon and Skyrme (Sly4) potentials.
The psd model-space calculated energy level is in a reasonable agreement with the experimental results at the lowest energy band (positively parity levels), while the higher band (negative parity levels) is shown greater value than the experimental data with about 2-12 MeV.
The shell model calculation used the large-basis consists of four shells (1s, 1p, 1d-2s, 1f-2p) truncated to (0+2) ћω which is enough convergence for these states because the expansion to 4 and 6 ћω give only a slight change in energy levels of the higher shell only. The large-basis calculation for the even parity energy level agreed well with the experimental results for both nuclei.
The elastic and inelastic form factors were calculated for the low-lying excited state of both nuclei using Skyrme (sly4) potential which shows good agreement with experimental data compared with that of wood-Saxon.