Determination of Dipole Polarization Effects in $^7$Li and $^{11}$Li

Details Determination of Dipole Polarization Effects in $^7$Li and $^{11}$Li Determination of Dipole Polarization Effects in $^7$Li and $^{11}$Li

1993-04-15

arxiv.org/abs/nucl-th/9304011v1

Nucl.Phys. A561 (1993) 157-180

Physics

Nuclear Physics

Nuclear Theory

26 pages LaTeX, 8 figures

Scientific paper

10.1016/0375-9474(93)90148-Q

The structure of $^6$Li, $^7$Li and $^{11}$Li nuclei is investigated in a model space which includes all configurations with oscillator energy up to $3\hbar\omega$ above the ground state configuration. The energy spectra and electromagnetic properties of the low-lying states are determined with various two-body interactions, which are derived from the Bonn potential. The results of these shell-model calculations depend on the strength of the tensor component contained in the NN interaction and also on the treatment of the Dirac spinors for the nucleons in the nuclear medium. In addition the calculation determines the {\it dipole polarizability} of $^7$Li and $^{11}$Li caused from virtual $E1$ excitations to the positive parity states of these nuclei. It is demonstrated that the BAGEL scheme provides a very powerful tool to consider contributions from virtual excitations up to large energies.

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