6533b7ddfe1ef96bd1274798
RESEARCH PRODUCT
Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases ofNo254andTh220
J. PiotMartín AlcortaMasato AsaiS. ZhuN. RowleyM. P. CarpenterC. NairF. G. KondevA. Lopez-martensT. LauritsenS. LakshmiA. V. KarpovB. P. KayT. L. KhooCalem HoffmanP. F. BertoneP. F. BertoneP. ReiterP. ChowdhuryC. J. ListerA. M. RogersB. GallAndreas Martin HeinzD. BoilleyG. HenningE. A. MccutchanG. GürdalPaul GreenleesD. SeweryniakC. J. ChiaraR. V. F. JanssensD. H. PotterveldB. B. BackK. Hauschildsubject
PhysicsCluster decayFissionNuclear TheoryExtrapolationShell (structure)General Physics and Astronomy7. Clean energyNuclear physicsmedicine.anatomical_structuremedicineAtomic physicsNuclear ExperimentSpin (physics)NucleusExcitationBar (unit)description
We report on the first measurement of the fission barrier height in a heavy shell-stabilized nucleus. The fission barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the fission barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical fission barriers test theories that predict properties of superheavy elements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-12-30 | Physical Review Letters |