Impact of uncertainties in reaction Q values on nucleosynthesis in type I x-ray bursts
Abstract
Nucleosynthesis in type I X-ray bursts may involve up to several thousand nuclear processes. The majority of these processes have only been determined theoretically due to the lack of sufficient experimental information. Accurate reaction Q-values are essential for reliable theoretical estimates of reaction rates. Those reactions with small Q-values (<1 MeV) are of particular interest in these environments as they may represent waiting points for a continuous abundance flow toward heavier-mass nuclei. To explore the nature of these waiting points, we have performed a comprehensive series of post-processing calculations which examine the sensitivity of nucleosynthesis in type I X-ray bursts to uncertainties in reaction Q-values. We discuss and list the relatively few critical masses for which measurements could better constrain the results of our studies. In particular, we stress the importance of measuring the mass of As65 to obtain an experimental Q-value for the Ge64(p,γ)As65 reaction.
- Publication:
-
Physical Review C
- Pub Date:
- April 2009
- DOI:
- 10.1103/PhysRevC.79.045802
- arXiv:
- arXiv:0811.0727
- Bibcode:
- 2009PhRvC..79d5802P
- Keywords:
-
- 21.10.Dr;
- 26.30.Ca;
- 26.60.Gj;
- 97.80.Jp;
- Binding energies and masses;
- Explosive burning in accreting binary systems;
- Neutron star crust;
- X-ray binaries;
- Astrophysics
- E-Print:
- accepted for Physical Review C