Neckedin Superdeformed Nuclei
(1997) In LundMPh 97:03. 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... (More)  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. (Less)
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https://lup.lub.lu.se/record/29228
 author
 Jönsson, LarsOve ^{LU}
 supervisor
 opponent

 Professor Ring, Peter, Technische Universität München, Germany
 organization
 publishing date
 1997
 type
 Thesis
 publication status
 published
 subject
 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
 in
 LundMPh
 volume
 97:03
 pages
 78 pages
 publisher
 Department of Mathematical Physics, Lund University
 defense location
 Kårhusets hörsal, LTH
 defense date
 19970425 10:15:00
 ISSN
 02823578
 ISBN
 9162824554
 language
 English
 LU publication?
 yes
 additional info
 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)
 id
 91617f94f6a54e5786af65cfafd1d810 (old id 29228)
 date added to LUP
 20160401 16:59:09
 date last changed
 20190522 07:01:01
@phdthesis{91617f94f6a54e5786af65cfafd1d810, 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.<br/><br> <br/><br> 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.<br/><br> <br/><br> 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.}}, author = {{Jönsson, LarsOve}}, isbn = {{9162824554}}, issn = {{02823578}}, 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}}, language = {{eng}}, publisher = {{Department of Mathematical Physics, Lund University}}, school = {{Lund University}}, series = {{LundMPh}}, title = {{Neckedin Superdeformed Nuclei}}, volume = {{97:03}}, year = {{1997}}, }