Abstract
Low-frequency states in deformed neutron-rich nuclei are investigated by means of the quasiparticle-random-phase approximation based on the Hartree-Fock-Bogoliubov formalism in the coordinate space. We have obtained the very strongly collective modes not only in neutron-rich Mg isotope but also in Cr and Fe isotopes in region, where the onset of nuclear deformation has been discussed. It is found that the spatially extended structure of neutron quasiparticle wave functions around the Fermi level brings about a striking enhancement of the transition strengths. It is also found that the fluctuation of the pairing field plays an important role in generating coherence among two-quasiparticle excitations of neutron.
- Received 17 February 2008
DOI:https://doi.org/10.1103/PhysRevC.77.044312
©2008 American Physical Society