Restoration of the N=82 shell gap from direct mass measurements of (132,134)Sn - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review Letters Year : 2008

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

M. Dworschak
  • Function : Author
G. Audi
  • Function : Author
K. Blaum
P. Delahaye
  • Function : Author
S. George
  • Function : Author
U. Hager
  • Function : Author
F. Herfurth
  • Function : Author
A. Herlert
  • Function : Author
A. Kellerbauer
  • Function : Author
H. J. Kluge
  • Function : Author
L. Schweikhard
  • Function : Author
C. Yazidjian
  • Function : Author

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.

Dates and versions

in2p3-00854785 , version 1 (28-08-2013)

Identifiers

Cite

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, 2008, 100, pp.072501. ⟨10.1103/PhysRevLett.100.072501⟩. ⟨in2p3-00854785⟩
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