6533b858fe1ef96bd12b61c7
RESEARCH PRODUCT
Restoration of theN=82Shell Gap from Direct Mass Measurements ofSn132,134
G. AudiH.-j. KlugeSebastian GeorgeDavid LunneyC. YazidjianU. HagerAlban KellerbauerKlaus BlaumP. DelahayeLutz SchweikhardM. DworschakFrank HerfurthAlexander Herlertsubject
PhysicsIsotope010308 nuclear & particles physicsFissionNuclear TheoryBinding energyGeneral Physics and AstronomyMass spectrometryPenning trap01 natural sciencesISOLTRAP0103 physical sciencesPhysics::Atomic and Molecular Clustersr-processNuclideAtomic physicsNuclear Experiment010306 general physicsdescription
A high-precision direct Penning trap mass measurement has revealed a 0.5-MeV deviation of the binding energy of (134)Sn from the currently accepted value. The corrected mass assignment of this neutron-rich nuclide restores the neutron-shell gap at N=82, previously considered to be a case of "shell quenching." In fact, the new shell gap value for the short-lived (132)Sn is larger than that of the doubly magic (48)Ca which is stable. The N=82 shell gap has considerable impact on fission recycling during the r process. More generally, the new finding has important consequences for microscopic mean-field theories which systematically deviate from the measured binding energies of closed-shell nuclides.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-02-22 | Physical Review Letters |