Phonon and multi-phonon excitations in rotational nuclei by exact diagonalization of the Bohr Hamiltonian

TL;DR

This paper uses exact numerical diagonalization of the Bohr Hamiltonian to predict phonon and multi-phonon excitations in deformed nuclei, highlighting the role of gamma deformation and signs of triaxiality.

Contribution

It introduces a precise SU(1,1)xSO(5) diagonalization method for detailed nuclear excitation predictions, emphasizing gamma deformation effects.

Findings

Gamma deformation significantly affects excitation spectra.

Signs of rigid triaxial deformation are identified.

Quantitative predictions align with experimental data.

Abstract

Exact numerical diagonalization of the Bohr Hamiltonian by SU(1,1)xSO(5) methods is used to obtain detailed quantitative predictions for single-phonon and multi-phonon excitations in well-deformed rotor nuclei. Dynamical gamma deformation is found to significantly influence the predictions through its coupling to the rotational motion. Basic signatures for the onset of rigid triaxial deformation are obtained.