Half-life of the yrast 2 + state in 188W: evolution of deformation and collectivity in neutron-rich tungsten isotopes

P.J.R. Mason, Zs. Podolyak, N. Mărginean, P.H. Regan, P.D. Stevenson, V. Werner, T. Alexander, A. Algora, T. Alharbi, M. Bowry, R. Britton, Alison Bruce, D. Bucurescu, M.R. Bunce, G. Căta-Danil, I. Căta-Danil, N. Cooper, D. Deleanu, D. Delion, D. FilipescuW. Gelletly, D. Ghită, I. Gheorghe, T. Glodariu, G. Ilie, D. Ivanova, S. Kisyov, S. Lalkovski, R. Lica, S. Liddick, R. Mărginean, C. Mihai, K. Mulholland, Cristina Nita, A. Negret, S. Pascu, S. Rice, Oliver Roberts, T. Sava, J.F. Smith, P.-A. Söderström, L. Stroe, G. Suliman, R. Suvaila, S. Toma, C. Townsley, E. Wilson, R.T. Wood, M. Zhekova, C. Zhou

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Abstract

The half-life of the yrast Iπ=2+ state in the neutron-rich nucleus 188W has been measured using fast-timing techniques with the HPGe and LaBr3:Ce array at the National Institute of Physics and Nuclear Engineering, Bucharest. The resulting value of t1/2=0.87(12) ns is equivalent to a reduced transition probability of B(E2;21+→01+)=85(12) W.u. for this transition. The B(E2;21+→01+) is compared to neighboring tungsten isotopes and nuclei in the Hf, Os, and Pt isotopic chains. Woods-Saxon potential energy surface (PES) calculations have been performed for nuclei in the tungsten isotopic chain and predict prolate deformed minima with rapidly increasing γ softness for 184-192W and an oblate minimum for 194W.
Original languageEnglish
JournalPhysical Review C
Volume88
Issue number4
DOIs
Publication statusPublished - 2 Oct 2013

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