Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-13
Astronomy and Astrophysics
Astrophysics
To appear in Astron. Astrophys., 14 pages with 9 figures
Scientific paper
Gamma-ray emission from classical novae is dominated, during the first hours, by positron annihilation resulting from the beta decay of radioactive nuclei. The main contribution comes from the decay of 18F and hence is directly related to 18F formation during the outburst. A good knowledge of the nuclear reaction rates of production and destruction of 18F is required to study 18F synthesis in novae and the resulting gamma-ray emission. The rates relevant for the main mode of 18F destruction (i.e, through proton captures) have been the object of many recent experiments. However, subsequent analyses were focused on providing rates for X-ray burst nucleosynthesis not valid at nova temperatures (lower than 3.5 10^8 K). Accordingly, it is crucial to propose and discuss new reaction rates, incorporating all new experimental results, down to the domain of nova nucleosynthesis. We show that in this temperature regime, the 18F(p,gamma) and (p,alpha) reaction rates remain uncertain and deserve further experimental and theoretical efforts. Our hydrodynamic calculations including the new nuclear rates demonstrate that their impact on 18F synthesis in nova explosions is quite large and, consequently, the early gamma-ray emission from classical novae is also affected.
Coc Alain
Hernanz Margarita
Jose Jordi
Thibaud Jean-Pierre
No associations
LandOfFree
Influence of new reaction rates on 18F production in novae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Influence of new reaction rates on 18F production in novae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Influence of new reaction rates on 18F production in novae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-148691