title: Restoration of the n=82 shell gap from direct mass measurements of 132,134Sn.
abstract: 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.
authors: GSI, Planckstrasse 1, 64291 Darmstadt, Germany. m.dworschak.gsi.de
authors: M
authors: M
authors: Dworschak
authors: G
authors: G
authors: Audi
authors: K
authors: K
authors: Blaum
authors: P
authors: P
authors: Delahaye
authors: S
authors: S
authors: George
authors: U
authors: U
authors: Hager
authors: F
authors: F
authors: Herfurth
authors: A
authors: A
authors: Herlert
authors: A
authors: A
authors: Kellerbauer
authors: H-J
authors: HJ
authors: Kluge
authors: D
authors: D
authors: Lunney
authors: L
authors: L
authors: Schweikhard
authors: C
authors: C
authors: Yazidjian