β - Dcopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

N. Alkhomashi, P. H. Regan, Zs Podolyák, 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. BoutachkovA. M. 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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51 Citations (Scopus)

Abstract

The low-lying structure of W188,190,192 has been studied following β decays of the neutron-rich mother nuclei Ta188,190,192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb208 primary beam on a natural beryllium target at the GSI Fragment Separator. The β-decay half-lives of Ta188, Ta190, and Ta192 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 W188, W190, and W192, which highlight a change in nuclear shape at W190 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 maximization of the γ-softness of the nuclear potential around N~116. © 2009 The American Physical Society.
Original languageEnglish
JournalPhysical Review C - Nuclear Physics
DOIs
Publication statusPublished - 8 Dec 2009
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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