Neutrino emission by the photo production process in a hyper-accretion disk

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dc.contributor.advisor Butler, Malcolm
dc.creator MacInnis, David R. (David Robert), 1977- 2011-05-09T12:32:04Z 2011-05-09T12:32:04Z 2004
dc.identifier.other QB464.2 M33 2004
dc.description vii, 79 leaves ; 28 cm.
dc.description Includes abstract.
dc.description Includes bibliographical references (leaves 75-77).
dc.description.abstract MacFadyen & Woosley (1999) have studied two models of a hypernova, where a hyper-accreting disk is created in the core of a star. Their code requires an accurate model of local energy loss given by neutrino emission. An emissivity of 3.5×10[superscript 34] ergs cm[superscript -3] s[superscript -1] can be calculated using conservation laws of an accretion disk around a black hole. MacFadyen & Woosley (1999) used 9×10[ superscript 34] ergs cm[superscript -3] s[superscript -1] in their models. In particular, in this thesis, I analyze the contribution of the photo neutrino process to the emissivity. For a temperature of 10[superscript 10] K, a density of 10[superscript 9] g/cm[superscript 3], and a chemical potential of 2.02×10[superscript 7] eV, emissivities of (8.7 +/- 0.1)×10[superscript 21] and (7.0 +/- 0.2)×10[superscript 21] ergs cm[superscript -3] sec[superscript -1] are found. Rates of (8.6 +/- 0.1)×10[superscript 26] and (7.3 +/- 0.2)×10[superscript 26] cm[superscript -3] sec[superscript -1] are also found with average neutrinos energies of (6.2 +/- 0.2) and (6.0. +/- 0.3) MeV. The calculation of the photo neutrino production process is a more robust calculation than seen in previous work with the use of the complete scatting amplitude, and the use of Monte Carlo integration methods.
dc.description.provenance Made available in DSpace on 2011-05-09T12:32:04Z (GMT). No. of bitstreams: 0 en
dc.language.iso en
dc.publisher Halifax, N.S. : Saint Mary's University
dc.subject.lcc QB464.2
dc.subject.lcsh Neutrino astrophysics
dc.subject.lcsh Stars -- Evolution
dc.subject.lcsh Neutrinos
dc.title Neutrino emission by the photo production process in a hyper-accretion disk
dc.type Text Master of Science in Astronomy Masters Astronomy and Physics Saint Mary's University (Halifax, N.S.)
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