Z=50 shell gap near 100Sn from intermediate-energy Coulomb excitations in even-mass 106--112Sn isotopes
Abstract
Rare isotope beams of neutron-deficient 106,108,110Sn nuclei from the fragmentation of 124Xe were employed in an intermediate-energy Coulomb excitation experiment yielding B(E2, 0+1 2+1) transition strengths. The results indicate that these B(E2,0+1 2+1) values are much larger than predicted by current state-of-the-art shell model calculations. This discrepancy can be explained if protons from within the Z = 50 shell are contributing to the structure of low-energy excited states in this region. Such contributions imply a breaking of the doubly-magic 100Sn core in the light Sn isotopes.
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