Acta Physica Polonica B

Vol. 38, No. 4, April 2007, page 1213

The Single-Particle and Collective Features in the Nuclei Just Above 132Sn

H. Mach, L.M. Fraile, O. Arndt, A. Blazhev, N. Boelaert, M.J.G. Borge, R. Boutami, H. Bradley, N. Braun, B.A. Brown, P.A. Butler, A. Covello, Z. Dlouhy, C. Fransen, H.O.U. Fynbo, A. Gargano, Ch. Hinke, P. Hoff, A. Joinet, A. Jokinen, J. Jolie, U. Koester, A. Korgul, K.-L. Kratz, T. Kroell, W. Kurcewicz, J. Nyberg, E.-M. Reillo, E. Ruchowska, W. Schwerdtfeger, G.S. Simpson, M. Stanoiu, O. Tengblad, P.G. Thirolf, W.B. Walters

The Advanced Time Delayed method has been used to measure the lifetimes of excited states in the exotic nuclei 134Sb, 135Sb and 136Te populated in the beta decay of 134Sn, 135Sn and 136Sn, respectively. High purity Sn beams were extracted at the ISOLDE separator using a novel production technique utilizing the molecular SnS+ beams to isolate Sn from contaminating other fission products. Among the new results we have identified the 1/2+ state in 135Sb and its E2 transition to the lower-lying 5/2+ state was found to be surprisingly collective. This measurement represents also one of the first applications of the LaBr3 scintillator to ultra fast timing.

PACS numbers: 24.30.Cz, 25.70.Gh


 
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