Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..195w&link_type=abstract
Astrophysical Journal, Part 1, vol. 219, Jan. 1, 1978, p. 195-212.
Astronomy and Astrophysics
Astrophysics
42
Abundance, Astrophysics, Branching (Physics), Neutron Flux Density, Nuclear Fusion, Stellar Evolution, Dysprosium Isotopes, Half Life, Krypton 85, Radioactive Decay, Selenium, Solar System, Steady Flow, Temperature Effects
Scientific paper
Recent investigations of the astrophysical site of the s-process strongly suggest the helium-burning shell of the helium-shell-flashing stars of intermediate mass as the most likely site for the s-process event which produced the solar-system abundances. Previous analyses of branching in the s-process have been in terms of a constant temperature and density environment. The occurrence of periodic thermal instabilities seems to make this assumption inappropriate. The current effort is to reformulate the mathematics of the branched s-process to allow for the influence of thermal pulses. The effect of pulses on the unique isobars between branches is generally small; the largest effect of pulses is at those branch points where the branching ratio for beta-decay during a pulse is small, but the beta-decay lifetime during the interpulse period is shorter than the time between pulses. It is shown that the decay of the unstable branch nuclei between neutron irradiations allows the mean s-process neutron flux responsible for the solar-system abundances in such a pulsed environment to be considerably larger than that for a single continuous-exposure event.
Newman Michael J.
Ward Richard A.
No associations
LandOfFree
S-process studies - The effects of a pulsed neutron flux 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 S-process studies - The effects of a pulsed neutron flux, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and S-process studies - The effects of a pulsed neutron flux will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-943233