2017/10/31 by Stefan Frauendorf, S Frauendorf
Earth and Planetary Sciences · Physics and Astronomy · #Bohr model #Cold Fusion and Nuclear Reactions #Degrees of freedom (physics and chemistry) #Hamiltonian (control theory) #Mean field theory #Nuclear physics research studies #Quantum and Classical Electrodynamics #Quasiparticle #Unified Model #Unified field theory #Yrast #nucl-th
paper · pdf · doi:10.1088/1402-4896/aaa2e9
150 pages, typos corrected, references added
openalex created_date 2017/10/20 · arxiv created 2017/12/15 · openalex publication_date 2018/03/01 · arxiv updated 2018/04/04 · openalex updated_date 2026/08/05
Abstract The key elements of the Unified Model are reviewed. The microscopic derivation of the Bohr Hamiltonian by means of adiabatic time-dependent mean field theory is presented. By checking against experimental data the limitations of the Unified Model are delineated. The description of the strong coupling between the rotational and intrinsic degrees of freedom in framework of the rotating mean field is presented from a conceptual point of view. The classification of rotational bands as configurations of rotating quasiparticles is introduced. The occurrence of uniform rotation about an axis that differs from the principle axes of the nuclear density distribution is discussed. The physics behind this tilted-axis rotation, unknown in molecular physics, is explained on a basic level. The new symmetries of the rotating mean field that arise from the various orientations of the angular momentum vector with respect to the triaxial nuclear density distribution and their manifestation by the level sequence of rotational bands are discussed. Resulting phenomena, as transverse wobbling, rotational chirality, magnetic rotation and band termination are discussed. Using the concept of spontaneous symmetry breaking the microscopic underpinning of the rotational degrees is refined.