Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223.1000s&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, Aug. 1, 1978, p. 1000-1014. Research sponsored by the U.S. Department of Energy.
Astronomy and Astrophysics
Astrophysics
8
A Stars, Abundance, Astronomical Models, Mass Distribution, Nuclear Fission, Abnormalities, Astrophysics, Nuclear Fusion, Rare Earth Elements, Xenon
Scientific paper
The role of nuclear fission in the astrophysical r-process is examined, and calculated fission fragment mass distributions are utilized to interpret observed elemental abundance data. A number of features of the solar system abundance curve are accounted for. An extension of the r-process to neutron numbers near 200 is required to provide a fission-source explanation of the rare-earth abundance peak. An r-process path that crosses the 184-neutron shell at A = 276 (about 4 Z-units lower than presently accepted) is suggested to account for the rare-earth abundances and the high ratio of masses 136 to 148. The 'xenon anomaly' is discussed within the general context of the treatment, and a superheavy fission precursor is shown to be unlikely. Correlations of abundance anomalies in Ap stars are pointed out, and the anomalies are classified according to cycle time.
Steinberg E. P.
Wilkins B. D.
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