Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-05-12
Phys.Rev.C81:055808,2010
Physics
Nuclear Physics
Nuclear Theory
10 pages, 10 figures, Phys. Rev. C, accepted
Scientific paper
10.1103/PhysRevC.81.055808
The influence of the stellar plasma on the production and destruction of K-isomers is studied for the examples 176Lu and 180Ta. Individual electromagnetic transitions are enhanced predominantly by nuclear excitation by electron capture, whereas the other mechanisms of electron scattering and nuclear excitation by electron transition give only minor contributions. It is found that individual transitions can be enhanced significantly for low transition energies below 100 keV. Transitions with higher energies above 200 keV are practically not affected. Although one low-energy transition in 180Ta is enhanced by up to a factor of 10, the stellar transition rates from low-K to high-K states via so-called intermediate states in 176Lu and 180Ta do not change significantly under s-process conditions. The s-process nucleosynthesis of 176Lu and 180Ta remains essentially unchanged.
Gosselin G.
Mohr Paul
Morel Pascal
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