Computer Science – Performance
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt........22w&link_type=abstract
Thesis (PhD). THE UNIVERSITY OF WISCONSIN - MADISON, Source DAI-B 63/08, p. 3767, Feb 2003, 125 pages.
Computer Science
Performance
1
Scientific paper
Neutrino flavor conversion, suggested by measurements of solar and atmospheric neutrinos, is the first strong evidence that neutrinos have mass. This work focuses on neutrinos from astrophysical sources and how they can be used to determine the character of neutrino conversion at the solar and atmospheric scales. First, we focus on oscillations at the solar scale. We find, by simulating data for three years running time, that measurements of the day, night and zenith spectra of charged current events at SNO will not be sufficient to select one of the existing solutions to the solar neutrino problem unless a significant energy dependent distortion is realized. Next, we determine the impact the recent neutral current measurement at SNO has on the solar neutrino problem. We analyze data from the SNO along with all other available solar neutrino data in the framework of two active neutrino oscillations. The inclusion of the day and night energy spectra of charged current, neutral current, and electron scattering events leads the Large Mixing Angle (LMA) oscillation solution being heavily favored. If the LMA solution is correct, the KamLAND reactor antineutrino experiment can measure the associated parameters. Unlike solar neutrino experiments, KamLAND can see a significant energy distortion in its event spectrum if LMA mixing parameters are realized, allowing a precision measurement to be made. We simulate data to make detailed predictions about KamLAND's performance. Next we turn our attention to neutrinos from supernova explosions. We first show that the inverted hierarchy of neutrino masses cannot be considered to be disfavored by the neutrinos detected from Supernova 1987A. Low detection statistics and large uncertainties in supernova models preclude strong inferences about neutrino physics. Finally, we make predictions about what could be learned from a future galactic supernova. The detection of the resultant neutrino burst could allow the mass hierarchy as well as the size of the only unknown neutrino mixing angle to be measured rather independently of supernova model considerations. We also show that the temperatures of the emergent neutrinos and the total binding energy of the core can be measured simultaneously.
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