Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-01-06
Phys.Rev.C71:034305,2005
Physics
Nuclear Physics
Nuclear Theory
20pages 5 figures. Accepted for publication in Physical Review C
Scientific paper
10.1103/PhysRevC.71.034305
The low-lying isovector dipole strengths in neutron rich nuclei $^{26}$Ne and $^{28}$Ne are investigated in the quasiparticle relativistic random phase approximation. Nuclear ground state properties are calculated in an extended relativistic mean-field theory plus BCS method where the contribution of the resonant continuum to pairing correlations is properly treated. Numerical calculations are tested in the case of isovector dipole and isoscalar quadrupole modes in the neutron rich nucleus $^{22}$O. It is found that in present calculation low-lying isovector dipole strengths at $E_x < 10$ MeV in nuclei $^{26}$Ne and $^{28}$Ne exhaust about 4.9% and 5.8% of the Thomas-Reiche-Kuhn dipole sum rule, respectively. The centroid energy of the low-lying dipole excitation is located at 8.3 MeV in $^{26}$Ne and 7.9 MeV in $^{28}$Ne.
Cao Li-Gang
Ma Zhong-Yu
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