We compare the yields of ^44Ti and ^56Ni produced from post-processing the thermodynamic trajectories from three different core-collapse models with the yields from exponential and power-law trajectories. The peak temperatures and densities achieved in these core-collapse models span several of the distinct nucleosynthesis regions we identify, resulting in different trends in the ^44Ti and ^56Ni yields for different mass elements. The ^44Ti and ^56Ni mass fraction profiles from the exponential and power-law profiles generally explain the tendencies of the post-processed yields, depending on which regions are traversed by the model. We also analyze the influence of specific nuclear reactions on the ^44Ti and ^56Ni abundance evolution. Our analysis suggests that not all ^44Ti need be produced in an α-rich freeze-out in core-collapse events, and that reaction rate equilibria in combination with timescale effects for the expansion profile may account for the paucity of ^44Ti observed in supernovae remnants.
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- November 2010