Relativistic Quasiparticle Random Phase Approximation
The relativistic quasiparticle random phase approximation (RQRPA) is
formulated in the canonical single-nucleon basis of the relativistic
Hartree-Bogoliubov (RHB) model. For the interaction in the particle-hole
channel effective Lagrangians with nonlinear meson self-interactions are
used, and pairing correlations are described by the pairing part of the
finite range Gogny interaction. The RQRPA configuration space includes the
Dirac sea of negative energy states. Both in the particle-hole and
particle-particle channels, the same interactions are used in the RHB
calculation of the ground state and in the matrix equations of the RQRPA.
The RHB+RQRPA approach is tested in the example of multipole excitations of
neutron rich oxygen isotopes. The RQRPA is applied in the analysis of the
evolution of the low-lying isovector dipole strength in Sn isotopes and N=82
isotones.
Illustrative presentation of the low-lying excitations in neutron rich nuclei:
N. Paar, T. Niksic, D. Vretenar and P. Ring "Quasiparticle
random phase approximation based on the relativistic Hartree-Bogoliubov
model" , Phys. Rev. C 67, 034312 (2003). nucl-th/0212011
N. Paar, T. Niksic, D. Vretenar and P. Ring, "Quasiparticle
random phase approximation based on the relativistic Hartree-Bogoliubov model
II: Nuclear spin and isospin excitations", Phys. Rev. C 69, 054303 (2004).
nucl-th/0402094
N. Paar, "Relativistic mean field description
of exotic excitations in finite nuclei", Doctoral Thesis, PHY 452d,
Universitaetsbibliothek der Technische Universitaet Muenchen (2003).(Postscript)
Illustrative presentation of the low-lying excitations in neutron rich nuclei:
