Physics – Nuclear Physics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..dnp.hg005m&link_type=abstract
American Physical Society, 2010 Fall Meeting of the APS Division of Nuclear Physics, November 2-6, 2010, abstract #HG.005
Physics
Nuclear Physics
Scientific paper
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.
Fryer Christopher
Hungerford Aimee
Magkotsios Georgios
Timmes Francis
Wiescher Michael
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