Abstract
We discuss anharmonicity of the multi–octupole-phonon states in based on a covariant density functional theory by fully taking into account the interplay between the quadrupole and the octupole degrees of freedom. Our results indicate the existence of a large anharmonicity in the transition strengths, even though the excitation energies are similar to those in the harmonic limit. We also show that the quadrupole-shape fluctuation significantly enhances the fragmentation of the two–octupole-phonon states in . Using those transition strengths as inputs to coupled-channels calculations, we then discuss the fusion reaction of at energies around the Coulomb barrier. We show that the anharmonicity of the octupole vibrational excitation considerably improves previous coupled-channels calculations in the harmonic-oscillator limit, significantly reducing the height of the main peak in the fusion barrier distribution.
- Received 13 January 2016
- Revised 15 April 2016
DOI:https://doi.org/10.1103/PhysRevC.94.011303
©2016 American Physical Society