Physics – Atomic Physics
Scientific paper
2009-03-11
Phys.Rev.Lett.102:210801,2009
Physics
Atomic Physics
More details, some changes to notation
Scientific paper
10.1103/PhysRevLett.102.210801
The 7.6 eV electromagnetic transition between the nearly degenerate ground state and first excited state in the Th-229 nucleus may be very sensitive to potential changes in the fine-structure constant, $\alpha = e^2/\hbar c$. However, the sensitivity is not known, and nuclear calculations are currently unable to determine it. We propose measurements of the differences of atomic transition frequencies between thorium atoms (or ions) with the nucleus in the ground state and in the first excited (isomeric) state. This will enable extraction of the change in nuclear charge radius and electric quadrupole moment between the isomers, and hence the $\alpha$-dependence of the isomeric transition frequency with reasonable accuracy.
Berengut Julian C.
Dzuba V. A.
Flambaum Victor V.
Porsev Sergey G.
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