Steady flow approximations to the helium r-process

Details Steady flow approximations to the helium r-process Steady flow approximations to the helium r-process

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..91..221c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 91, no. 2, April 1983, p. 221-234. Research supported by the University of

Astronomy and Astrophysics

Astrophysics

18

Absorption Cross Sections, Heavy Nuclei, Helium Plasma, Neutron Cross Sections, Radioactive Decay, Steady Flow, Astrophysics, Beta Particles, Particle Density (Concentration), Plasma Layers

Scientific paper

A steady flow approximation to the r-process is presented and used for numerical experiments with physical quantities to determine the sensitivity of the process to variations in those quantities. The effect of neutron capture cross sections along the capture path and of recently available improved beta decay rates on the r-process are discussed. The peaks in the observed r-process yield curve near mass numbers 80 and 130 are roughly characterized by a neutron number density of 10 to the 20th per cu/cm; the mean beta decay rates are about 10/s, and the freezing time is comparable to or less than 0.1 s. The peak near mass number 195 is roughly characterized by a neutron number density of 10 to the 21st/cm, the mean beta decay rates are about 100/s, and the freezing time is comparable to or less than 0.01 s. The flow path of the steady state r-process is sensitively dependent upon the neutron capture cross sections in the flow network and on the values of the beta decay rates.

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