Dynamical Effects beyond Mean Field in Drip Line Nuclei

概要

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Effects of the collective modes on the shell structure have been investigated in the nuclei near the ^10Be and ^24O core, at the neutron drip line. Energy shifts of the single-particle states are calculated by the particle-vibration coupling model taking into account the coupling to low-lying collective vibrational states. In the case of ^10Be core, the coupling to the lowest 2^+ state is found to be the most important effect to lower and raise the single-particle energies of 2s_1/2 and 1p_1/2 states, respectively, and leads to a much narrower gap between the two states than that of the Woods-Saxon potential. In the case of ^24O core, the single-particle energies below the Fermi level behave unusually in the calculations with the particle(hole)-vibration coupling compared with heavy nuclei near the ^208Pb core. The single-particle energy of the 1d_5/2 state is lowered by the coupling to the collective 2^+ states which gives an upward shift in heavy nuclei. Moreover the energy of 2s_1/2 state is also lowered by the coupling to 3^- states due to very specific effects found in the case of ^24O core, i.e., the blocking of the available configuration space for the particle(hole)-vibration couplings.
2002-12-26