TY - JOUR
T1 - Reaction rate sensitivity of 44Ti production in massive stars and implications for a thick target yield for 40Ca(α,γ) 44Ti
AU - Hoffman, Robert D.
AU - Sheets, Steve
AU - Burke, Jason
AU - Scielzo, Nick
AU - Rauscher, Thomas
PY - 2010
Y1 - 2010
N2 - The dynamic synergy between observation, theory, and experiment developed over many years around the field of γ-ray astronomy has as its ultimate goal observations of specific radionuclides informing our understanding of stellar explosions and the theoretical models that predict nucleosynthesis. Observations of 56,57Ni and their decay products 56,57Co are used in many ways to constrain our current models of the core collapse mechanism. The radionuclide 44Ti (τ1/2 = 58.9 +- 0.3 yr), made in the same explosive environment but in much lower amounts compared to the very abundant nickel isotopes, is hoped to one day serve as an even more sensitive diagnostic and a valuable probe to the conditions extant in some of the deepest layers to be ejected. We [1] investigate 44Ti nucleosynthesis in adiabatic expansions from peak conditions drawn from a model for Cassiopia A and determine variations due to experimental uncertainties in two key reaction rates. We find that the current uncertainty in these two rates could lead to as large a variation in 44Ti synthesis as that produced by different treatments of stellar physics in historical models of SNII.
AB - The dynamic synergy between observation, theory, and experiment developed over many years around the field of γ-ray astronomy has as its ultimate goal observations of specific radionuclides informing our understanding of stellar explosions and the theoretical models that predict nucleosynthesis. Observations of 56,57Ni and their decay products 56,57Co are used in many ways to constrain our current models of the core collapse mechanism. The radionuclide 44Ti (τ1/2 = 58.9 +- 0.3 yr), made in the same explosive environment but in much lower amounts compared to the very abundant nickel isotopes, is hoped to one day serve as an even more sensitive diagnostic and a valuable probe to the conditions extant in some of the deepest layers to be ejected. We [1] investigate 44Ti nucleosynthesis in adiabatic expansions from peak conditions drawn from a model for Cassiopia A and determine variations due to experimental uncertainties in two key reaction rates. We find that the current uncertainty in these two rates could lead to as large a variation in 44Ti synthesis as that produced by different treatments of stellar physics in historical models of SNII.
UR - http://www.scopus.com/inward/record.url?scp=84887469467&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:84887469467
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 11th Symposium on Nuclei in the Cosmos, NIC 2010
Y2 - 19 July 2010 through 23 July 2010
ER -