The waiting point approximation in R-process calculations

Details The waiting point approximation in R-process calculations The waiting point approximation in R-process calculations

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..91..235c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 91, no. 2, April 1983, p. 235-243. Research supported by the University of

Astronomy and Astrophysics

Astrophysics

26

Heavy Nuclei, Neutron Flux Density, Nuclear Capture, Nuclear Fusion, Particle Production, Photonuclear Reactions, Abundance, Carbon 13, Helium, Neutron Decay, Stellar Temperature, Thermonuclear Reactions, Weak Interactions (Field Theory)

Scientific paper

The steady flow approximation to the r-process has been used to evaluate the validity of the waiting point assumption (that, for a given charge number Z, neutron captures become balanced by neutron photodisintegrations) under a variety of conditions. The criterion for the accuracy of the approximation for any set of nuclei with the same value of Z is that the ratio of the total rate of neutron photodisintegration in those nuclei to the total rate of neutron captures should be close to unity. No set of conditions involving neutron production by helium thermonuclear reactions (at temperatures up to 10 to the 9th K) could be found for which the waiting point approximation is useful for all values of Z, and it is recommended that all such r-process calculations not use this approximation. At higher temperatures, such as those characteristic of explosive carbon burning (2 x 10 to the 9th K), the waiting point approximation is much better.

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