Abstract
Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and have been discovered in the heavy nucleus. The observation of the shorter-lived isomer was made possible by a novel application of a digital data acquisition system. The isomers were interpreted as the , two-quasineutron and the , four-quasiparticle configurations, respectively. Surprisingly, the lifetime of the two-quasiparticle isomer is more than 4 orders of magnitude shorter than what has been observed for analogous isomers in the lighter isotones. The four-quasiparticle isomer is longer lived than the ground state that decays exclusively by spontaneous fission with a half-life of . The absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance relative to the ground state.
- Received 24 June 2015
- Publisher error corrected 29 September 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.132502
© 2015 American Physical Society
Corrections
29 September 2015