Dipole resonances in oxygen isotopes in time-dependent density-matrix theory
M. Tohyama, A. S. Umar
Abstract
The strength functions of isovector dipole resonances in the even oxygen isotopes 1824O are calculated by using an extended version of the time-dependent Hartree-Fock theory known as the time-dependent density-matrix theory (TDDM). The results are compared with recent experimental data and also with a shell-model calculation. It is found that the observed isotope dependence of low-lying dipole strength is reproduced in TDDM when the strength of the residual interaction is properly chosen. It is also found that there is a difference between the TDDM prediction and the shell-model calculation for 24O.
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