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Title: The sources of economic growth in the New Zealand economy after 1950
Author: Llewellyn, Graeme Ernest John
ISNI:       0000 0001 0711 4121
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1973
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This thesis investigates some aspects of the ordering of nuclear spin systems at low temperatures. The thesis is divided into two parts. In part one some nuclear orientation experiments of 74As in Fe and 206Bi and Ni and Fe are described. These nuclei are orientated by the large hyperfine field inside Ni and Fe. The orientation is detected by the anisotropy of the emitted gamma-rays and in the case of 74As by the destruction of this anisotropy by NMR. Chapter one reviews the theory of the nuclear orientation method. To aid in the interpretation of the 206Bi results, some channelling experiments were done. A review of the method of atom location by channelling is given in chapter two. Chapter three describes the apparatus and technique used. The results of the 74AsFe experiments are given in chapter four. In these experiments the magnetic moment of the ground state of 74As was measured to be μ = 1.597(3), the sign of the hyperfine field was found to be positive, and the spin-lattice relaxation time was found to be 120(30) s. The results of the 206BiNi experiments are given in chapter five. The hyperfine was found to be 390(15) kOe for both diffused polycrystalline and implanted single crystal samples. The multipolarity mixing ratios of many of the gamma,-rays were found. Reorientation of the metastable state of 206Pb was observed, which had not been expected. On the basis of the channelling experiments, this reorientation has been explained by the theory.
Supervisor: Corden, W. M. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Economic development ; Manufactures ; Economic conditions ; New Zealand