beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

N. Alkhomashi, P. H. Regan, Zs. Podolyak, S. Pietri, A. B. Garnsworthy, S. J. Steer, J. Benlliure, E. Caserejos, R. F. Casten, J. Gerl, H. J. Wollersheim, J. Grebosz, G. Farrelly, M. Gorska, I. Kojouharov, H. Schaffner, A. Algora, G. Benzoni, A. Blazhev, P. BoutachkovA. M. Bruce, A. M. Denis Bacelar, I. J. Cullen, L. Caceres, P. Doornenbal, M. E. Estevez, Y. Fujita, W. Gelletly, Robert Hoischen, R. Kumar, N. Kurz, S. Lalkovski, Z. Liu, C. Mihai, F. Molina, A. I. Morales, D. Muecher, W. Prokopowicz, B. Rubio, Y. Shi, A. Tamii, S. Tashenov, J. J. Valiente-Dobon, P. M. Walker, P. J. Woods, F. R. Xu

    Research output: Contribution to journalArticlepeer-review


    The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.
    Original languageEnglish
    JournalPhysical Review C (Nuclear Physics)
    Issue number6
    Publication statusPublished - 2009

    Subject classification (UKÄ)

    • Subatomic Physics


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