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Phys. Rev. C 73, 024316 (2006) [17 pages]

Systematics of isomeric configurations in N=77 odd-Z isotones near the proton drip line

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M. N. Tantawy1,*, C. R. Bingham1,2, K. P. Rykaczewski2, J. C. Batchelder3, W. Królas4,5,6, M. Danchev1, D. Fong4, T. N. Ginter7, C. J. Gross2, R. Grzywacz1,2, K. Hagino8, J. H. Hamilton4, D. J. Hartley1,†, M. Karny9, K. Li4, C. Mazzocchi1, A. Piechaczek10, A. V. Ramayya4, K. Rykaczewski11, D. Shapira2, A. Stolz7, J. A. Winger12, C.-H. Yu2, and E. F. Zganjar10
1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
2Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
4Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831, USA
5Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
6Institute of Nuclear Physics, Polish Academy of Sciences, PL-31-342 Kraków, Poland
7National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
8Department of Physics, Tohoku University, Sendai, 980-8578 Japan
9Institute of Experimental Physics, Warsaw University, Warsaw, PL-00681, Poland
10Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
11G. W. School of Mechanical Engineering, Georgia Institute of Technology, Georgia 30332, USA
12Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA

Received 16 September 2005; published 22 February 2006

The systematics of the πh11/2⊗νh11/2 and πh11/2⊗νs1/2 isomeric configurations was studied for the odd-Z N=77 isotones near the proton drip line. The isomeric decays in 140Eu, 142Tb, 144Ho, and 146Tm were measured by means of x-ray, γ-ray, and charged particle spectroscopy at the Recoil Mass Spectrometer at the Holifield Radioactive Ion Beam Facility (ORNL). The spin and parity of Iπ=8+ and 5- were deduced for the isomers in 140Eu and 142Tb. New decay schemes were established, and the half-lives of the 8+ isomers were measured to be 302(4) ns for 140m2Eu and 25(1) μs for 142m2Tb. No evidence for the expected 1+ ground-state was found in the 144Ho decay data. The proton-emission from 146Tm was restudied. Five proton transitions were assigned to two proton-emitting states. The half-lives of 198(3) ms and 68(3) ms and the spin and parity values of Iπ=10+ and 5- were established for 146mTm and 146gsTm, respectively. For the first time for an odd-odd nucleus, the interpretation of the observed decay properties and structure of the proton-emitting states was made by accounting for deformation and proton and neutron coupling to the core excitations. A complex wave-function structure was obtained, with dominating components of πh11/2⊗νh11/2 for the 10+ isomer and πh11/2⊗νs1/2 for the 5- ground state.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.024316
DOI:
10.1103/PhysRevC.73.024316
PACS:
23.20.Lv, 21.10.Tg, 23.50.+z, 27.60.+j

*Part of M. N. Tantawy's Ph.D. dissertation, with 146Tm data analyzed by J. C. Batchelder and M. N. Tantawy.

†Present address: Department of Physics, United States Naval Academy, Annapolis, Maryland 21402, USA.

 
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