Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.212501
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Funding
- DFG
- BNSF [DFNI-E02/6]
- EU [664732]
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The reduced magnetic dipole and electric quadrupole transition probabilities for the radiative decay of the Th-229 7.8 eV isomer to the ground state are predicted within a detailed nuclear-structure model approach. We show that the presence and decay of this isomer can only be accounted for by the Coriolis mixing emerging from a remarkably fine interplay between the coherent quadrupole-octupole motion of the nuclear core and the single-nucleon motion within a reflection-asymmetric deformed potential. We find that the magnetic dipole transition probability which determines the radiative lifetime of the isomer is considerably smaller than presently estimated. The so-far disregarded electric quadrupole component may have non-negligible contributions to the internal conversion channel. These findings support new directions in the experimental search of the Th-229 transition frequency for the development of a future nuclear frequency standard.
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