Abstract
Rates for the and reactions have been calculated, including both resonant and nonresonant contributions. The sequential two-neutron capture process on has also been reevaluated on the basis of new experimental results. It is shown that a one-step dineutron capture reaction may enhance the sequential two-neutron reaction rate by several orders of magnitude. This opens the possibility that reaction flow through may occur in competition with the bottle-neck three-body reactions (2 and the that initiate the α process and provide seed nuclei for the process. Here we explore the effect of such dineutron capture on -process nucleosynthesis. We show that such reactions have little effect on the final abundance and would change only -process abundances in an extremely neutron-rich low-temperature process.
1 More- Received 22 February 2005
DOI:https://doi.org/10.1103/PhysRevC.74.015802
©2006 American Physical Society