Hyperfine studies of Th-229 in its nuclear ground and isomeric state

Johannes Thielking
The Th-229 nucleus possesses an exceptionally low-lying isomeric state of about 8 eV, about four orders of magnitude lower than common nuclear excitation energies. This state is coupled to the ground state by a magnetic dipole transition with an estimated linewidth of less than 1 mHz. It has been proposed to use this unique transition as a reference for a new type of optical clock. Such a nuclear clock is expected to be highly immune...
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