Search for ultra high energy astrophysical neutrinos with the ANITA experiment

dc.contributor.author Romero-Wolf, Andrew Frederic
dc.date.accessioned 2016-04-13T21:19:38Z
dc.date.available 2016-04-13T21:19:38Z
dc.date.issued 2010-12
dc.description Ph.D. University of Hawaii at Manoa 2010.
dc.description Includes bibliographical references.
dc.description.abstract This work describes a search for cosmogenic neutrinos at energies above 1018 eV with the Antarctic Impulsive Transient Antenna (ANITA). ANITA is a balloon-borne radio interferometer designed to measure radio impulsive emission from particle showers produced in the Antarctic ice-sheet by ultra-high energy neutrinos (UHEν). Flying at 37 km altitude the ANITA detector is sensitive to 1M km3 of ice and is expected to produce the highest exposure to ultra high energy neutrinos to date. The design, flight performance, and analysis of the first flight of ANITA in 2006 are the subject of this dissertation. Due to sparse anthropogenic backgrounds throughout the Antarctic continent, the ANITA analysis depends on high resolution directional reconstruction. An interferometric method was developed that not only provides high resolution but is also sensitive to very weak radio emissions. The results of ANITA provide the strongest constraints on current ultra-high energy neutrino models. In addition there was a serendipitous observation of ultra-high energy cosmic ray geosynchrotron emissions that are of distinct character from the expected neutrino signal. This thesis includes a study of the radio Cherenkov emission from ultra-high energy electromagnetic showers in ice in the time-domain. All previous simulations computed the radio pulse frequency spectrum. I developed a purely time-domain algorithm for computing radiation using the vector potentials of charged particle tracks. The results are fully consistent with previous frequency domain calculations and shed new light into the properties of the radio pulse in the time domain. The shape of the pulse in the time domain is directly related to the depth development of the excess charge in the shower and its width to the observation angle with respect to the Cherenkov direction. This information can be of great practical importance for interpreting actual data.
dc.identifier.uri http://hdl.handle.net/10125/101931
dc.language.iso eng
dc.publisher [Honolulu] : [University of Hawaii at Manoa], [December 2010]
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Physics.
dc.subject Antarctic Impulsive Transient Antenna
dc.subject ultra high energy astrophysical neutrinos
dc.title Search for ultra high energy astrophysical neutrinos with the ANITA experiment
dc.type Thesis
dc.type.dcmi Text
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