An ion accelerator has been constructed which, is capable of accelerating very intense monoenergetic beams of protons or deuterons up to 50 KEV energy. Total ion currents of 500 µ amps containing 30 to 40% atomic ions have been obtained. The intensity and high definition of the beam makes it possible to collimate after magnetic analysis, 50 µ amps of protons or deuterons at 30 KEV energy into a 1/16 inch diameter spot on a target. This deuteron beam incident on a heavy ice target is capable of producing a neutron flux of 3 x 10⁸ neutrons/sec from the "D on D" reaction at 50 KEV bombarding energy or the equivalent of the neutrons from 20 curies of radium used in a Ra-Be source. The intrinsic interest of the D-D reactions to nuclear physics had prompted the construction of a scattering chamber to be used in conjunction with the accelerator. An experimental arrangement has been designed and constructed for the measurement of the energy dependent characteristics of the companion reactions, D(d,n)He³ and D(d,p)H³, which has a potential accuracy considerably greater than previously reported. As well, the extension of studies to much lower energies has been made possible by the large ion currents available. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

The nuclear magnetic resonance technique has been used to study the effect of deuteration on the Neel temperature of CoCl₂•6H₂0 single crystals. The Neel temperature varies with a period of 180° as the external magnetic field is rotated about the b-axis⊥ the a-c plane. On deuteration, the Neel temperature rises for all orientations, the more deuterium being introduced the higher the transition point. The maximum increase of approximately 6% in Neel temperature is obtained with a 92% concentration of deuterium. In addition, the anisotropy in TN decreases from approximately 0.08°K for 0% deuteration to slightly less than 0.05°K for 92% deuteration. Further, the orientation-averaged Neel temperature seems to vary linearly with the cube root of relative concentration of deuterium. In the vicinity of H₀ = 4,000 gauss, the Neel temperature increases with an increase in the external magnetic field [formula omitted] being ⊥ c-axis. This unusual behaviour is common to deuterated as well as non-deuterated samples and has not yet been explained. Following Haseda's conjecture, a semi-empirical attempt is made to establish a connection among the change in Neel temperature upon deuteration, the super-exchange parameter and the potential of a proton in a hydrogen bond. The picture presented is that the Neel temperature rises on deuteration because of a change in the average of the super-exchange parameter over the ground vibrational state of the hydrogen atom. An x-ray analysis shows that at room temperature the CoCl₂•6H₂0 and CoC1₂•6D₂0 crystals have the same symmetry and their cell dimensions do not differ by more than 0.2%. The infra-red spectrum of CoC1₂•6D₂0 has been used to determine the value of electrostatic field gradient at the deuteron sites. This value is consistent with the observed quadrupole splitting of the n.m.r. spectrum of the deuterons. The n.m.r. lines belonging to deuterons in the water molecules not forming a square configuration around cobalt ions have been identified. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

The spin-lattice relaxation time T₁ has been measured for the proton and the deuteron resonances in methane -and its deuterated modifications as a function of density ƿ , at low densities where T₁ is proportional to ƿ ; and temperature T, between 110°K and 300°K. For the proton relaxation, plots of log T₁/ƿ versus log T for each of the gases CH₄₌ո Dո, n=0, 1, 2, 3 gave the temperature dependence of T₁/ƿ as T₁/ƿ∝T⁻³ʹ² . The value of T₁/ƿ at constant temperature changed very little with n. This implied that the main interaction contributing to proton spin relaxation was the spin-rotational interaction. For the deuteron results it was found that T₁/ƿ was nearly independent of temperature but differed by a factor of approximately four over the range of isotopic compositions n = 1, 2, 3,4. CD₄ gave the shortest value of T₁ while CHD₃ gave the longest. This was attributed to the dominance of the quadrupolar interaction of the deuteron over the dipolar and spin-rotational interactions. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (p. 141-150).

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