Mathematics – Logic
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........9w&link_type=abstract
Thesis (PhD). UNIVERSITY OF CALIFORNIA, LOS ANGELES, Source DAI-B 61/02, p. 894, Aug 2000, 146 pages.
Mathematics
Logic
Scientific paper
In this thesis I would like to introduce an experimental approach to solve the dark matter problem that is one of the hottest unsolved physics problems today. I have been involved for several years to solve that problem in UCLA- Torino Dark Matter search team at CERN, Geneva. The UCLA- Torino dark matter team is searching for the Super Symmetric dark matter particle named neutralino, that is a candidate for the WIMPs (Weakly Interactive Massive Particles). So, many parts of this thesis will be filled with description of the dark matter search work of the UCLA-Univ. of Torino collaboration with 1-kg two-phase xenon detector that was supposed to be mounted at the laboratory in the middle of the Mt. Blanc tunnel with an expecting event rate of 3 ~ 4 events/kg/day. Even though most physicists believe the existence of dark matter, I would like to review the inventory of the dark matter in the universe, cosmological approach for the dark matter, and astrophysical approach for that problem in the first few chapters. I will introduce the already found evidences of the non-baryonic dark matter, for example MACHO, gravitational lensing, super nova, etc. Theoretical approaches and several direct detection methods will be reviewed also. The direct WIMPs searching detectors need the extremely powerful background discrimination because there is a huge amount of background in that energy range of dark matter signal. Xenon and xenon detector meet all the requirements well for the background rejection. Especially, a two-phase xenon WIMP detector provides much better background rejection than a single phase one. Also we will show the outstanding effect of the electroluminescence plates with CsI internal photo cathode that magnify the primary scintillation and increase the efficiency of the background rejection. Applying the CsI internal photo cathode to the xenon WIMP detector is one of major topics for this dissertation.
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