Clayton, Donald D.2009-06-042009-06-041990Sturner, Steven J.. "Positron survival in type II supernovae." (1990) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/13475">https://hdl.handle.net/1911/13475</a>.https://hdl.handle.net/1911/13475In this work I investigate the possibility of Type II supernovae being the origin for positrons producing observed annihilation radiation observed toward the Galactic center. It was my contention that the decay of $\sp{56}$Co coupled with falling densities would allow for the production and extended existence of positrons in the supernova outflow. Supernova 1987A has prompted many people to construct models of supernova outflow. I use the results of two existing models as the initial conditions in my models. I have created both an analytic and a computer model for the survival of positrons. These models show that while Type II supernovae fall short of the needed production of surviving positrons, the lower densities existing in Type I supernovae may be a more promising source.64 p.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.AstronomyAstrophysicsThesisThesis Sp. Sci. 1990 Sturner