Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

andrea Jungclaus*, J. Walker, J. Leske, K. H. Speidel, A. E. Stuchbery, M. East, P. Boutachkov, J. Cederkäll, P. Doornenbal, J. L. Egido, A. Ekström, J. Gerl, R. Gernhäuser, N. Goel, M. Górska, I. Kojouharov, P. Maier-Komor, V. Modamio, F. Naqvi, N. PietrallaS. Pietri, W. Prokopowicz, H. Schaffner, R. Schwengner, H. J. Wollersheim

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    Precise measurements of the lifetimes of the first excited 2+ states in the stable even-A Sn isotopes 112-124Sn have been performed using the Doppler shift attenuation technique. For the isotopes 112Sn, 114Sn and 116Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.

    Original languageEnglish
    Pages (from-to)110-114
    Number of pages5
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume695
    Issue number1-4
    DOIs
    Publication statusPublished - 10 Jan 2011

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