β-delayed spectroscopy of neutron-rich-tantalum nuclei: Shape evolution in neutro-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. Górska, I. Kojouharov, H. Schaffner, A. Algora, G. Benzoni, A. Blazhev, P. BoutachkovAlison Bruce, A.M. Denis Bacelar, I.J. Cullen, L. Cáceres, P. Doornenbal, M.E. Estevez, Y. Fujita, W. Gelletly, R. Hoischen, R. Kumar, N. Kurz, S. Lalkovski, Z. Liu, C. Mihai, F. Molina, A.I. Morales, D. Mücher, W. Prokopowicz, B. Rubio, Y. Shi, A. Tamii, S. Tashenov, J.J. Valiente-Dobón, P.M. Walker, P.J. Woods, F.R. Xu

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Abstract

The low-lying structure of 188,190,192W has been studied following β decays of the neutron-rich mother nuclei 188,190,192Ta produced following the projectile fragmentation of a 1-GeV-per-nucleon 208Pb primary beam on a natural beryllium target at the GSI Fragmentation Separator. The β-decay half-lives of 188Ta, 190Ta and 192Ta have been measured, with γ-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion β-γ correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in 188W, 190W and 192W, which highlight a change in nuclear shape at 190W 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~190 region and is consistent with maximisation of the γ-softness of the nuclear potential around N~116
Original languageEnglish
JournalPhysical Review C
Volume80
Issue number6
DOIs
Publication statusPublished - Dec 2009

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    Alkhomashi, N., Regan, P. H., Podolyak, Z., Pietri, S., Garnsworthy, A. B., Steer, S. J., Benlliure, J., Caserejos, E., Casten, R. F., Gerl, J., Wollersheim, H. J., Grebosz, J., Farrelly, G., Górska, M., Kojouharov, I., Schaffner, H., Algora, A., Benzoni, G., Blazhev, A., ... Xu, F. R. (2009). β-delayed spectroscopy of neutron-rich-tantalum nuclei: Shape evolution in neutro-rich tungsten isotopes. Physical Review C, 80(6). https://doi.org/10.1103/PhysRevC.80.064308