Anomalous behavior of 2+ excitations around 132Sn

J. Terasaki, J. Engel, W. Nazarewicz, and M. Stoitsov
Phys. Rev. C 66, 054313 – Published 27 November 2002
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Abstract

In certain neutron-rich Te isotopes, a decrease in the energy of the first excited 2+ state is accompanied by a decrease in the E2 strength to that state from the ground state, contradicting simple systematics and general intuition about quadrupole collectivity. We use a separable quadrupole-plus-pairing Hamiltonian and the quasiparticle random phase approximation to calculate energies, B(E2,0+2+) strengths, and g factors for the lowest 2+ states near 132Sn (Z>~50). We trace the anomalous behavior in the Te isotopes to a reduced neutron pairing above the N=82 magic gap.

  • Received 21 August 2002

DOI:https://doi.org/10.1103/PhysRevC.66.054313

©2002 American Physical Society

Authors & Affiliations

J. Terasaki1,2,3, J. Engel4, W. Nazarewicz1,2,5, and M. Stoitsov1,2,3,6

  • 1Department of Physics, University of Tennessee, Knoxville, Tennessee 37996
  • 2Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831
  • 3Joint Institute for Heavy Ion Research, P.O. Box 2008, Building 6008, MS 6374 Oak Ridge, Tennessee 37831
  • 4Department of Physics and Astronomy, University of North Carolina, CB 3255, Phillips Hall, Chapel Hill, North Carolina 27599
  • 5Institute of Theoretical Physics, University of Warsaw, ulnica Hoża 69, PL-00-681 Warsaw, Poland
  • 6Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Science, Sofia-1784, Bulgaria

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Vol. 66, Iss. 5 — November 2002

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