Abstract
Superdeformation, i.e. elongated shapes with the longest axis approximately twice as long as the shorter axes, has provided many new insights in nuclear structure. In this dissertation the possibility of forming superdeformed states related to two connected spheres, having a more or less pronounced neck, is investigated. Detailed NilssonStrutinsky calculations with the cranked WoodsSaxon potential and a finiterange liquid drop model are carried out in the 180Hg region, where superdeformed states related to two overlapping 90Zr are predicted. Detailed spectroscopic properties are calculated.
The effect of the necking degree of freedom on the the giant dipole resonance, GDR, is investigated. The calculations are carried out with the WoodsSaxon potential for the singleparticle states, and the random phase approximation formalism for the phonon states. The residual interaction and coupling constants are determined by requirements of translational invariance. The lower energy component of the GDR spectrum for superdeformed shapes, corresponding to vibrations along the symmetry axis, is diminished with increasing necking, and the mean energy of the GDR is increased.
The folded Yukawaplusexponential liquid drop models take into account the finite range of the nuclear force, which is important when elongated and neckedin nuclear shapes are considered. However, it is shown that they are unstable towards higher multipole deformations, and that unphysical shapes are obtained in free minimizations when too high multipole deformations are included. Limits on multipolarity are given as functions of mass number.
The effect of the necking degree of freedom on the the giant dipole resonance, GDR, is investigated. The calculations are carried out with the WoodsSaxon potential for the singleparticle states, and the random phase approximation formalism for the phonon states. The residual interaction and coupling constants are determined by requirements of translational invariance. The lower energy component of the GDR spectrum for superdeformed shapes, corresponding to vibrations along the symmetry axis, is diminished with increasing necking, and the mean energy of the GDR is increased.
The folded Yukawaplusexponential liquid drop models take into account the finite range of the nuclear force, which is important when elongated and neckedin nuclear shapes are considered. However, it is shown that they are unstable towards higher multipole deformations, and that unphysical shapes are obtained in free minimizations when too high multipole deformations are included. Limits on multipolarity are given as functions of mass number.
Original language  English 

Qualification  Doctor 
Awarding Institution 

Supervisors/Advisors 

Award date  1997 Apr 25 
Publisher  
ISBN (Print)  9162824554 
Publication status  Published  1997 
Bibliographical note
Defence detailsDate: 19970425
Time: 10:15
Place: Kårhusets hörsal, LTH
External reviewer(s)
Name: Ring, Peter
Title: Professor
Affiliation: Technische Universität München, Germany

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)
Subject classification (UKÄ)
 Physical Sciences
Free keywords
 Matematisk och allmän teoretisk fysik
 thermodynamics
 statistical physics
 gravitation
 cranked NilssonStrutinsky
 superdeformation
 neckedin shapes
 RPA
 giant dipole resonance
 finiterange liquid drop model
 Mathematical and general theoretical physics
 classical mechanics
 relativity
 quantum mechanics
 klassisk mekanik
 kvantmekanik
 relativitet
 statistisk fysik
 termodynamik
 Fysicumarkivet A:1997:Jönsson