Study of the N = 77 odd- Z isotones near the proton-drip line

M. N. Tantawy, C. R. Bingham, C. Mazzocchi, R. Grzywacz, W. Królas, K. P. Rykaczewski, J. C. Batchelder, C. J. Gross, D. Fong, J. H. Hamilton, D. J. Hartley, J. K. Hwang, Y. Larochelle, A. Piechaczek, A. V. Ramayya, D. Shapira, J. A. Winger, C. H. Yu, E. F. Zganjar

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The evolution of the πh 11/2νh 11/2 and πh 11/2νs 1/2 isomeric configurations was studied for the N = 77 isotones near the proton drip line. The decays of metastable levels in 140Eu, 142Tb , and 144Ho were measured by means of X-, gamma- and conversion electron spectroscopy at the Recoil Mass Spectrometer at Oak Ridge. The sequence of isomeric levels in 140Eu was experimentally determined. The half-life of the πh 11/2νh 11/2 state in 142Tb was remeasured to be 25(1) μs. The spins and parities of 5- and 8+ for the πh 11/2νs 1/2 and πh 11/2νh 11/2 142Tb isomers, respectively, were established from measured multipolarities. No evidence for the expected 1+ ground state was found in the 144Ho decay data.

Original languageEnglish
Pages (from-to)151-153
Number of pages3
JournalEuropean Physical Journal A
Issue numberSUPPL. 1
StatePublished - 1 Sep 2005
Externally publishedYes


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