Shape coexistence and isomeric states in neutron-rich 112Tc and 113Tc

Alison Bruce, S. Lalkovski, A.M. Denis-Bacelar, M. Gorska, S. Pietri, Z. Podolyák, Y. Shi, P.M. Walker, F.R. Xu, P. Bednarczyk, L. Caceres, E. Caserejos, I.J. Cullen, P. Doornenbal, G.F. Farrelly, A.B. Garnsworthy, H. Geissel, W. Gelletly, J. Gerl, J. GreboszC. Hinke, G. Ilie, G. Jaworski, I. Kojouharov, N. Kurz, S. Myalski, M. Palacz, W. Prokopowicz, P.H. Regan, H. Schaffner, S. Steer, S. Tashenov, H.J. Wollersheim

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Isomeric states in 112Tc and 113Tc, with half-lives of 150 (17) ns and 500 (100) ns respectively, have been observed following the relativistic fission of 238U. The fission fragments have been separated in a fragment separator and identified by means of energy loss and time-of-flight techniques. In both nuclei, the ground-state configuration is calculated to have an oblate shape and the isomerism is proposed to arise due to transitions from a triaxial excited state to a low-lying oblate state.
Original languageEnglish
JournalPhysical Review C
Issue number4
Publication statusPublished - 14 Oct 2010


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