Physics – Nuclear Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvc..44.2839k&link_type=abstract
Physical Review C (Nuclear Physics), Volume 44, Issue 6, December 1991, pp.2839-2849
Physics
Nuclear Physics
37
Elementary Particle Processes, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
On the basis of the improved level scheme of 176Lu it is demonstrated that the stellar s-process production as well as the stellar beta decay rate of that nucleus depend strongly on temperature. This behavior results from the completely different half-lives of the ground state and the isomer; since these states are coupled by induced transitions in the hot stellar photon bath, the effective half-life of 176Lu is drastically reduced. The 5- state at 838.64 keV was identified as the most efficient mediating level. Consequently, 176Lu can no longer be considered as a chronometer for the age of the s process; instead, it can be interpreted as an s-process thermometer yielding a temperature range between 2.4×108 to 3.6×108 K.
Beer Hermann
Käppeler Franz
Klay N.
Schatz Gerd
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