… The present study of the nuclear structure of 229Th is a part of our systematic investigation
of the high-mass border of the “… hyperfine structure levels, originating from the nuclear 5/2 …

… data on 229Th only the structure of levels below 300 keV is clearly understood. To obtain
a better understanding of the low-energy structure of 229Th we have measured lifetimes of …

… The spin and parity of the 229 Th nuclear ground state have been determined to be I π = 5/2
+ (refs 22,23 ). The isomeric state was assigned I π = 3/2 + (ref. ) and experimentally verified …

… that the constant-nuclear-density ansatz is supported by nuclear … effect of the octupole
deformation on the sensitivity to α … the effect of variation of the dimensionless fine-structure constant…

… like the fine structure constant or the nucleon mass on the transition frequency. For the nuclear
candidate 229Th we … V selfconsistent nuclear structure calculations and determine via the …

… great deal of interest in the nuclear level structure of 229Th since it was reported [1] that the
first excited state is at the unusually low energy of ⩽ 5 eV. Later work by the same authors [2] …

… present work belongs to a series of papers following a research program developed at our
laboratory on the level structures of the members of the (4n 1) radioactive chain: 249Cf 25,26, …

… the direct optical X-ray excitation of 229 Th to the second excited state (29-keV level; Fig. 1)
and determine its key nuclear … T 1/2 , and the excitation linewidth of the cross-band transition, …

… the first energy measurement of the 229 Th nuclear isomer and the direct detection of one of
the products of the … We use the internal conversion decay of the isomeric excited state in a …

… , the isomeric first excited state of 229 Th (denoted 229m Th). Here we … the direct detection
of this nuclear state, which is further confirmation of the existence of the isomer and lays the …