published_or_final_version / abstract / Physics / Doctoral / Doctor of Philosophy

Thesis (M.Phil.)--Chinese University of Hong Kong. / Bibliography: leaves 100-102.

Chan Man Ho = 中微子星的形成與特徵 / 陳文豪. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 84-87). / Text in English; abstracts in English and Chinese. / Chan Man Ho = Zhong wei zi xing de xing cheng yu te zheng / Chen Wenhao. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- History of dark matter research --- p.1 / Chapter 1.2 --- Method of searching for dark matter --- p.3 / Chapter 1.2.1 --- Observation of dark matter --- p.3 / Chapter 1.2.2 --- N-body simulation --- p.4 / Chapter 1.3 --- Candidates of dark matter --- p.7 / Chapter 1.3.1 --- Properties of neutrinos --- p.8 / Chapter 1.3.2 --- Neutrino oscillation --- p.9 / Chapter 1.3.3 --- Decay of neutrinos --- p.10 / Chapter 1.4 --- Origin of neutrino dark matter --- p.11 / Chapter 2 --- Properties of Neutrino Stars --- p.16 / Chapter 2.1 --- Hydrostatic Equilibrium --- p.16 / Chapter 2.2 --- Ultra-relativistic degenerate neutrino star --- p.17 / Chapter 2.2.1 --- Trajectory inside an ultra-relativistic neutrino star --- p.19 / Chapter 2.2.2 --- Rotation curve of an ultra-relativistic neutrino star --- p.20 / Chapter 2.3 --- Non-relativistic neutrino star --- p.21 / Chapter 2.3.1 --- Trajectories inside a non-relativistic neutrino star --- p.22 / Chapter 2.3.2 --- Rotation curve of non-relativistic neutrino stars --- p.24 / Chapter 2.4 --- Neutrino Mixing correction --- p.24 / Chapter 3 --- Neutrino star in galaxy --- p.26 / Chapter 3.1 --- Neutrino star in galactic center --- p.26 / Chapter 3.1.1 --- The rate of change of mass of neutrino star --- p.27 / Chapter 3.1.2 --- Motion inside the neutrino star in milky way --- p.27 / Chapter 3.2 --- Neutrino star in Milky Way --- p.30 / Chapter 3.2.1 --- Components of Milky Way --- p.32 / Chapter 3.2.2 --- Dark matter component in Milky Way --- p.33 / Chapter 4 --- Hot gas and Neutrino star in cluster --- p.40 / Chapter 4.1 --- Neutrino dark matter model --- p.41 / Chapter 4.1.1 --- Cowsik and McClelland model --- p.41 / Chapter 4.1.2 --- Treumann et al. model --- p.42 / Chapter 4.2 --- NFW universal dark matter profile --- p.43 / Chapter 4.3 --- Probing dark matter distribution --- p.44 / Chapter 4.4 --- Neutrino stars in clusters --- p.48 / Chapter 4.5 --- Heat source of hot gas --- p.52 / Chapter 4.5.1 --- Infall and compressional heating --- p.53 / Chapter 4.5.2 --- Heating by ejection from galaxies --- p.53 / Chapter 4.5.3 --- Heating by galaxy motion --- p.54 / Chapter 4.5.4 --- Heating by relativistic electrons --- p.55 / Chapter 4.5.5 --- Heating by photons from neutrino decay --- p.55 / Chapter 5 --- Formation of neutrino star --- p.58 / Chapter 5.1 --- Hydrodynamic code --- p.58 / Chapter 5.2 --- Hydrodynamic evolution of neutrino star --- p.61 / Chapter 5.2.1 --- Result of the simulation --- p.61 / Chapter 5.2.2 --- Scaling law of neutrino star formation --- p.66 / Chapter 5.2.3 --- Oscillation in neutrino star --- p.67 / Chapter 5.3 --- Expected Observational Results --- p.69 / Chapter 6 --- Discussion and conclusion --- p.72 / Chapter 6.1 --- Conclusion --- p.72 / Chapter 6.2 --- discussion --- p.74 / Chapter A --- Derivation of TOV equation --- p.76 / Chapter B --- Equation of state of degenerate ideal gas --- p.80 / Chapter C --- Derivation of oscillation period --- p.82 / Bibliography --- p.84

archives@tulane.edu / This dissertation details a measurement of the n-$^{4}$He coherent scattering length to be $b_{4\rm{He}} = [3.0982 \pm\: 0.00214\; (\rm{stat}) \pm\: 0.00077\; (\rm{sys})]$ fm utilizing a perfect silicon crystal neutron interferometer. This measurement provides over a factor of 10 improvement in precision and differs by $0.162$ fm compared to the most commonly used value. Neutron interferometry provides a tool for precision scattering lengths measurements for a variety of isotopes. Examples include coherent scattering length measurements for $^{1}$H, $^{2}$H, $^{3}$He and the incoherent scattering length of $^{3}$He. Neutron scattering lengths of light nuclei provide useful tests of nuclear potential models and serve as inputs for nuclear effective field theories. A monolithic, perfect silicon neutron interferometer splits the wave function of a single neutron via Bragg diffraction into two coherent paths spatially separated to the extent of a few centimeters. A sample of $^{4}$He gas, contained within an aluminum cell, is introduced into one beam path which produces a phase shift directly proportional to $b_{4\rm{He}}$. Significant effort has been spent quantifying important systematic considerations that include thermal transfer from the gas cell to the interferometer crystal and deformation of the gas cell walls due to gas pressure which ranges from 7 bar to 13 bar which were calculated by an FEA simulation. Thermal transfer between the gas cell and interferometer crystal induces a change of the intrinsic interferometer phase which is dependent on sample position. This additional systematic phase has been named the shadow phase. A glycol cooling system was used to mitigate the shadow phase and a special measurement pattern was devised to account for possible shadow phase drift. This work was performed at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR). / 1 / Robert Haun

Thesis (Ph. D.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.

No description available.

No description available.

No description available.

N/A

Thesis (M.Sc.). / Written for the Dept. of Physics. Title from title page of PDF (viewed 2008/12/10). Includes bibliographical references.