Abstract
Recent halo star abundance observations exhibit an important feature of consequence to the process: the presence of a main process between the second and third peaks that is consistent among halo stars. We explore fission cycling and steady β flow as the driving mechanisms behind this feature. The presence of fission cycling during the process can account for nucleosynthesis yields between the second and third peaks, whereas the presence of steady β flow can account for consistent -process patterns, robust under small variations in astrophysical conditions. We employ the neutrino-driven wind of the core-collapse supernova to examine fission cycling and steady β flow in the process. As the traditional neutrino-driven wind model does not produce the required very neutron-rich conditions for these mechanisms, we examine changes to the neutrino physics necessary for fission cycling to occur in the neutrino-driven wind environment, and we explore under what conditions steady β flow is obtained.
2 More- Received 9 October 2007
DOI:https://doi.org/10.1103/PhysRevC.77.035804
©2008 American Physical Society