Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-02-02
Nucl.Phys. A678 (2000) 235-257
Physics
Nuclear Physics
Nuclear Theory
25 pages, 3 figures, LaTeX, epsfig. Nucl. Phys. A (in press)
Scientific paper
10.1016/S0375-9474(00)00331-6
The interrelation between the octupole phonon and the low-lying proton-neutron mixed-symmetry quadrupole phonon in near-spherical nuclei is investigated. The one-phonon states decay by collective E3 and E2 transitions to the ground state and by relatively strong E1 and M1 transitions to the isoscalar 2+ state. We apply the proton-neutron version of the Interacting Boson Model including quadrupole and octupole bosons (sdf-IBM-2). Two F-spin symmetric dynamical symmetry limits of the model, namely the vibrational and the \gamma-unstable ones, are considered. We derive analytical formulae for excitation energies as well as B(E1), B(M1), B(E2) and B(E3) values for a number of transitions between low-lying states.
Isacker Piet Van
Mizusaki Takahiro
Pietralla Norbert
Smirnova Nadya A.
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