Nucleosynthesis in Common Envelope Accretion Disks: Probing the Mechanisms of Element Formation Around Neutron Stars

This thesis will present the results from single zone Post Processed Nucle-
osynthesis simulations of Common Envelope accretion discs centred around
either a neutron star to better understand the composition of the material
that is produced and investigate the impact that different accretion rates,
initial abundances and companion masses have on the resulting isotopic and
element abundances. Accretion disks around neutron stars of mass 1.5 M⊙
and 2 M⊙ inside companion envelopes of 12 M⊙, 15 M⊙ and 20 M⊙ compan-
ions were analysed. This thesis will also present a comparison between post
processing nucleosynthesis code reaction librararies, as well as a comparison
between four different post processing nucleosynthesis codes for a range of
different astrophysical environments.