Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-03-23
Phys.Rev.C79:045804,2009
Physics
Nuclear Physics
Nuclear Experiment
11 pages, 4 figures accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.79.045804
The s-process branching at mass number A = 176 depends on the coupling between the high-K ground state and a low-lying low-K isomer in 176Lu. This coupling is based on electromagnetic transitions via intermediate states at higher energies. The properties of the lowest experimentally confirmed intermediate state at 839 keV are reviewed, and the transition rate between low-K and high-K states under stellar conditions is calculated on the basis of new experimental data for the 839 keV state. Properties of further candidates for intermediate states are briefly analyzed. It is found that the coupling between the high-K ground state and the low-K isomer in 176Lu is at least one order of magnitude stronger than previously assumed leading to crucial consequences for the interpretation of the 176Lu/176Hf pair as an s-process thermometer.
Bisterzo Sara
Gallino Roberto
Käppeler Franz
Kneissl U.
Mohr Paul
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