Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt........19h&link_type=abstract
Proquest Dissertations And Theses 2007. Section 0024, Part 0606 162 pages; [Ph.D. dissertation].United States -- Rhode Island:
Physics
Neutrino Detection, Coded Aperture, Solar Neutrinos
Scientific paper
A neutrino-electron scattering occuring in liquid 4 He results in an energetic electron that deposits its energy into the liquid through various mechanics. Some of this energy deposition is released in the form of detectable signals, among which is the scintillation signals: photons in the extreme ultraviolet range. The isotropic scintillation signal can be detected and analysed to reconstruct the energy and position of the original electron in the neutrino scattering, which provides information regarding the energy spectrum of the neutrino flux itself.
In one proposed version of a neutrino detector, the scintillation signals are observed using ~2000 sensors capable of detecting individual 16 eV photons. Each of these sensor is a calorimeter in the shape of a thin metallic film deposited on a large wafer. The wafers are arranged in two parallel planes above the liquid body, forming a coded-aperture imaging array. Large numbers of Monte Carlo events are generated with various sets of design parameters of the system, and the systematic and statistical behavior is studied to decide the optimal design and its accuracy in determining solar neutrino fluxes.
This method of detecting scintillation signals is intended to be used in HERON, a proposed detector for low energy solar neutrinos-- pp and 7 Be neutrinos from the Sun. The study shows that, at temperatures below 40 mK, with ~40 ton-year worth of fiducial events from the 4 He body, the pp and 7 Be solar neutrino fluxes can be determined with a combined systematic and statistical error of < 1.5% for total flux, and separately < 1.7% for pp and < 3.5% for 7 Be.
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