Analytic Description of Critical Point Actinides in a Transition from Octupole Deformation to Octupole Vibrations

Details Analytic Description of Critical Point Actinides in a Transition from Octupole Deformation to Octupole Vibrations Analytic Description of Critical Point Actinides in a Transition from Octupole Deformation to Octupole Vibrations

2005-05-05

arxiv.org/abs/nucl-th/0505017v1

Phys.Rev. C71 (2005) 064309

Physics

Nuclear Physics

Nuclear Theory

LaTeX, 27 pages, including 14 postscript figures

Scientific paper

10.1103/PhysRevC.71.064309

An analytic collective model in which the relative presence of the quadrupole and octupole deformations is determined by a parameter (phi_0), while axial symmetry is obeyed, is developed. The model [to be called the analytic quadrupole octupole axially symmetric model (AQOA)] involves an infinite well potential, provides predictions for energy and B(EL) ratios which depend only on phi_0, draws the border between the regions of octupole deformation and octupole vibrations in an essentially parameter-independent way, and describes well 226-Th and 226-Ra, for which experimental energy data are shown to suggest that they lie close to this border. The similarity of the AQOA results with phi_0=45 degrees for ground state band spectra and B(E2) transition rates to the predictions of the X(5) model is pointed out. Analytic solutions are also obtained for Davidson potentials, leading to the AQOA spectrum through a variational procedure.

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