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Restoration of the N=82 shell gap from direct mass measurements of (132,134)Sn

M. Dworschak G. Audi 1 K. Blaum P. Delahaye S. George U. Hager F. Herfurth A. Herlert A. Kellerbauer H. J. Kluge D. Lunney 2 L. Schweikhard C. Yazidjian 
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
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.
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M. Dworschak, G. Audi, K. Blaum, P. Delahaye, S. George, et al.. Restoration of the N=82 shell gap from direct mass measurements of (132,134)Sn. Physical Review Letters, American Physical Society, 2008, 100, pp.072501. ⟨10.1103/PhysRevLett.100.072501⟩. ⟨in2p3-00854785⟩



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