J. Terasaki, J. Engel, W. Nazarewicz, M. Stoitsov
Published 2002-08-21, updated 2002-10-04Version 2
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.
Comments: 1 figure added. to be published in Phys. Rev. C
Journal: Phys.Rev. C66 (2002) 054313
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