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Phys. Rev. C 68, 054310 (2003) [14 pages]

Evidence for chiral symmetry breaking in 140Eu?

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A. A. Hecht1,*, C. W. Beausang1, H. Amro1, C. J. Barton1,2,†, Z. Berant1,2,3, M. A. Caprio1, R. F. Casten1, J. R. Cooper1,‡, D. J. Hartley4,§, R. Krücken4,**, D. A. Meyer1, H. Newman1, J. R. Novak1, N. Pietralla1,5,††, J. J. Ressler1, A. Wolf1,2,3, N. V. Zamfir1,6, Jing-Ye Zhang4, and K. E. Zyromski1
1Yale University, New Haven, Connecticut 06520, USA
2Department of Physics, Clark University, Worcester, Massachusetts 10610, USA
3Nuclear Research Center-Negev, Beer Sheva 84190, Israel
4Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
5Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794, USA
6National Institute for Physics and Nuclear Engineering, Bucharest, Romania

Received 25 July 2003; published 21 November 2003

High spin states in 140Eu were populated following the reaction 92Mo(51V,2pn) at a beam energy of 205 MeV by the ESTU accelerator at the Wright Nuclear Structure Laboratory, Yale University. A total of 5 bands and 69 transitions were assigned to 140Eu. The assignments were based on Kα x-ray coincidences and on excitation function measurements. γ-γ and γ-γ-γ coincidence matrices were created. Directional correlation of oriented states analysis, angular distributions, and Compton asymmetry measurements were performed and B(M1)∕B(E2) branching ratios were extracted. The band assignments and structures are discussed in terms of the rotational model and interpreted following a series of cranked shell model and total Routhian surface calculations. In particular, two pairs of bands, one pair based on the πh11∕2⊗νh11∕2 configuration, the other based on the π(g7∕2,d5∕2)⊗νh11∕2 configuration, are identified. These bands show some features expected of either chiral partners or shape coexistence, based on triaxial shapes with γ∼±25°. Further measurements are required to distinguish between these two possibilities.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.68.054310
DOI:
10.1103/PhysRevC.68.054310
PACS:
21.10.Re, 23.20.Lv, 27.60.+j, 23.90.+w

*Electronic address: adam.hecht@yale.edu

†Present address: CLRC Daresbury Laboratory, UK.

‡Present address: Lawrence Livermore National Laboratory, Livermore, CA 94551, USA.

§Present address: Department of Physics, U.S. Naval Academy, Annapolis, MD 21402, USA.

**Permanent address: Physik Department E12, Technische Universität München, 85748 Garching, Germany.

††Present address: Universität zu Köln, Köln, Germany.

 
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