Identification and decay of the 0.48 ms 13/2(+) isomer in Hg-181

A. N. Andreyev*, S. Antalic, D. Ackermann, T. E. Cocolios, V. F. Comas, J. Elseviers, S. Franchoo, S. Heinz, J. A. Heredia, F. P. Hessberger, S. Hofmann, M. Huyse, J. Khuyagbaatar, I. Kojouharov, B. Kindler, B. Lommel, R. Mann, R. D. Page, S. Rinta-Antila, P. J. SappleS. Saro, P. Van Duppen, M. Venhart, H. V. Watkins

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A new isomer with a half-life of 0.48(2) ms was identified in the nuclide Hg-181, which was produced in the complete fusion reaction Ca-40 + Sm-144 -> Pb-184* at the velocity filter SHIP (GSI, Darmstadt). The isomeric state was tentatively assigned a spin-parity of 13/2(+). We propose that this isomer de-excites by a yet unobserved low-energy, strongly converted gamma-ray transition, followed by a newly identified cascade composed of a 90.3 keV M1 and a 71.4 keV E2 gamma-ray transition.

Original languageEnglish
Article numberARTN 044334
Number of pages6
JournalPhysical Review C
Volume80
Issue number4
DOIs
Publication statusPublished - 29 Oct 2009

Keywords

  • ISOTOPES
  • CHARGE RADII
  • SPECTROSCOPY
  • ALPHA-DECAY
  • SPINS
  • MOMENTS

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