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Reference: Koh, Young., (1994). Nuclear structure studies involving polarised iodine, samarium and europium. DPhil. University of Oxford.Citable link to this page:


Nuclear structure studies involving polarised iodine, samarium and europium Subtitle: Experimental techniques and theoretical models

Abstract: Low Temperature Nuclear Orientation (LTNO) is an important technique in the study ofnuclei far from stability. The theory of LTNO and its application to the measurement of staticnuclear moments and other quantities of spectroscopic interest are reviewed.The off-line facility at Oxford was used to study the decay of 133I→133Xe and 135I→135Xe. 133I having Z=53 and N=80 has three protons above the closed shell Z=50 andtwo neutrons holes in N=82 shell, while 135I has fully closed neutron shell since it has N=82, and they are of considerable theoretical interest since a wide variety of the theoreticalnuclear models may be used to describe the observed levels close to the stable double closedshell structure. Another aim is to search for the nuclear magnetic dipole moment of the groundstate of 135I. Nuclear orientation of 133IFe and 135IFe enabled the mixing ratios of severaltransitions in the decay scheme of 133I and 135I to be determined. From temperature dependencefor 135I, the nuclear magnetic moment of 135I has been deduced. Also temperature dependencefor 133I, analysed using a simple model, gave value for the magnetic hyperfine field that differedfrom previous published values. The method of combining nuclear orientation with NMR hasbecome a very popular technique in recent years for determining nuclear magnetic dipolemoments very precisely. The purpose of the NMR/ON experiment was to measure the hyperfinefield with greater precision and to get some idea of the proportion of nuclei subject to it.Light Eu and Sm nuclei have attracted attention as systems with the number of protonsright below the Z=64 subshell gap and the number of neutrons approaching N=82 major shellclosure. Odd-proton, odd-neutron and odd-odd nuclei near the A=140 region have beeninvestigated in the framework of the particle-triaxial rotor model. Main attention has been paidto explanation of experimental magnetic dipole and electric quadrupole moments of ground andisomeric states. Model predictions for deformation parameters of 136-142Sm even-even cores havebeen extracted.

Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:This thesis was digitised thanks to the generosity of Dr Leonard Polonsky


Stone, N. J.More by this contributor



Dr. N.J. StoneMore by this contributor


 Bibliographic Details

Issue Date: 1994Identifiers

Urn: uuid:fa4e489d-a235-4787-aab1-60f5a3b14c23

Source identifier: 603835710 Item Description

Type: Thesis;

Language: eng Subjects: Nuclear structure Nuclear orientation Low temperatures Iodine Isotopes Samarium Europium Hyperfine interactions Tiny URL: td:603835710


Author: Koh, Young. - institutionUniversity of Oxford facultyFaculty of Physical Sciences facultyMathematical and Physical Sciences Divis



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