First observation of the drip line nucleus 140Dy: Identification of a 7 μs K isomer populating the ground state band

W. Królas, 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. WingerC. H. Yu, E. F. Zganjar, A. T. Kruppa, W. Nazarewicz, T. Vertse

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Abstract

A new 7 μs 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 γ-γ coincidences. Five cascading γ transitions were interpreted as the decay of an Iπ = 8- {ν9/2-[514]⊗ ν7/2+[404]} Kisomer (T 1/2 = 7.0(5) μs) via the ground-state band. The probability of proton emission from 141Ho to the 0+ ground state and to the 2+ excited state in 140Dy is discussed.

Original languageEnglish
Article number031303
Pages (from-to)313031-313034
Number of pages4
JournalPhysical Review C - Nuclear Physics
Volume65
Issue number3
DOIs
Publication statusPublished - Mar 1 2002

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Królas, W., Grzywacz, R., Rykaczewski, K. P., Batchelder, J. C., Bingham, C. R., Gross, C. J., Fong, D., Hamilton, J. H., Hartley, D. J., Hwang, J. K., Larochelle, Y., Lewis, T. A., Maier, K. H., McConnell, J. W., Piechaczek, A., Ramayya, A. V., Rykaczewski, K., Shapira, D., Tantawy, M. N., ... Vertse, T. (2002). First observation of the drip line nucleus 140Dy: Identification of a 7 μs K isomer populating the ground state band. Physical Review C - Nuclear Physics, 65(3), 313031-313034. [031303]. https://doi.org/10.1103/physrevc.65.031303