Acta Physica Polonica B

Vol. 34, No. 4, April 2003, page 2315

First Observation of Excited States in 140Dy

W. Krolas, R. Grzywacz, K.P. Rykaczewski, J.C. Batchelder, C.R. Bingham, C.J. Gross, D. Fong, J.H. Hamilton, D.J. Hartley, J.K. Hwang, Y. Larochelle, T.A. Lewis, K.H. Maier, J.W. McConnell, A. Piechaczek, A.V. Ramayya, K. Rykaczewski, D. Shapira, M.N. Tantawy, J.A. Winger, C.-H. Yu, E.F. Zganjar, A.T. Kruppa, W. Nazarewicz, T. Vertse

A new 7 \mu s isomer in the drip line nucleus 140Dy was selected from the products of the 54Fe (315 MeV) + 92Mo reaction by a recoil mass spectrometer and studied with recoil-delayed \gamma --\gamma coincidences. Five cascading \gamma transitions were interpreted as the decay of an I\pi =8- { \nu 9/2- [514] \otimes \nu 7/2+ [404]}K isomer via the ground state band.

PACS numbers: 23.20.Lv, 21.10.Tg, 27.60.+j

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