β-delayed spectroscopy of neutron-rich-tantalum nuclei: Shape evolution in neutro-rich tungsten isotopes

Alkhomashi, N., Regan, P.H., Podolyak, Zs., 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., Boutachkov, P., Bruce, A.M., Denis Bacelar, A.M., Cullen, I.J., Cáceres, L., Doornenbal, P., Estevez, M.E., Fujita, Y., Gelletly, W., Hoischen, R., Kumar, R., Kurz, N., Lalkovski, S., Liu, Z., Mihai, C., Molina, F., Morales, A.I., Mücher, D., Prokopowicz, W., Rubio, B., Shi, Y., Tamii, A., Tashenov, S., Valiente-Dobón, J.J., Walker, P.M., Woods, P.J. and Xu, F.R. (2009) β-delayed spectroscopy of neutron-rich-tantalum nuclei: Shape evolution in neutro-rich tungsten isotopes Physical Review C, 80 (6). ISSN 1089-490X

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Official URL: http://prc.aps.org/abstract/PRC/v80/i6/e064308

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

Item Type:Journal article
Subjects:F000 Physical Sciences > F300 Physics
DOI (a stable link to the resource):10.1103/PhysRevC.80.064308
Faculties:Faculty of Science and Engineering > School of Computing, Engineering and Mathematics > Engineering and Product Design Research > Nuclear Physics
ID Code:6852
Deposited By:editor environment
Deposited On:20 Jan 2010
Last Modified:20 Apr 2012 10:04

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