Z=50 shell gap near 100Sn from intermediate-energy Coulomb excitations in even-mass 106--112Sn isotopes
C. Vaman, C. Andreoiu, D. Bazin, A. Becerril, A. Brown, C. M. Campbell, A. Chester, J. M. Cook, D. C. Dinca, A. Gade, D. Galaviz, T. Glasmacher, M. Hjorth-Jensen, M. Horoi, D. Miller, V. Moeller, W. F. Mueller, A. Schiller, K. Starosta, A. Stolz, J. R. Terry, A. Volya, V. Zelevinsky, H. Zwahlen
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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