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Z=50 shell gap near $^{100}$Sn from intermediate-energy Coulomb excitations in even-mass $^{106--112}$Sn 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
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Abstract

Rare isotope beams of neutron-deficient $^{106,108,110}$Sn nuclei from the fragmentation of $^{124}$Xe were employed in an intermediate-energy Coulomb excitation experiment yielding $B(E2, 0^+_1 \to 2^+_1)$ transition strengths. The results indicate that these $B(E2,0^+_1 \to 2^+_1)$ 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 $^{100}$Sn core in the light Sn isotopes.

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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. 2006-12-08. Z=50 shell gap near $^{100}$Sn from intermediate-energy Coulomb excitations in even-mass $^{106--112}$Sn isotopes. https://doi.org/10.1103/physrevlett.99.162501

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