Energy-dependence of skin-mode fraction in E1 excitations of neutron-rich nuclei
Department of Physics, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage, Chiba 263-8522, Japan
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Published online: 28 May 2015
We have extensively investigated characters of the low-energy E1 strengths in N > Z nuclei, by analyzing the transition densities obtained by the HF+RPA calculations with several eﬀective interactions. Crossover behavior has been confirmed, from the skin mode at low energy to the pn mode at higher energy. Decomposing the E1 strengths into the skin-mode, pn-mode and interference fractions, we show that the ratio of the skin-mode strength to the full strength may be regarded as a generic function of the excitation energy, insensitive to nuclides and eﬀective interactions, particularly beyond Ni.
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