Coulomb energy contribution to the excitation energy in $^{229}$Th and enhanced effect of $α$ variation

Details Coulomb energy contribution to the excitation energy in $^{229}$Th and enhanced effect of $α$ variation Coulomb energy contribution to the excitation energy in $^{229}$Th and enhanced effect of $α$ variation

2008-07-21

arxiv.org/abs/0807.3218v2

Europhys.Lett.85:50005,2009

Physics

Nuclear Physics

Nuclear Theory

6 pages,2 figures

Scientific paper

10.1209/0295-5075/85/50005

We calculated the contribution of Coulomb energy to the spacing between the ground and first excited state of $^{229}$Th nucleus as a function of the deformation parameter $\delta$. We show that despite the fact that the odd particle is a neutron, the change in Coulomb energy between these two states can reach several hundreds KeV.This means that the effect of the variation of the fine structure constant $\alpha=e^2/\hbar c$ may be enhanced $\Delta U_C/E \sim 10^4$ times in the $E=$7.6 eV "nuclear clock" transition between the ground and first excited states in the $^{229}$Th nucleus.

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