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Stabilization of Nuclear Isovector Valence-Shell Excitations

Rainovski, G., Pietralla, N., Ahn, T., Lister, C.J., Janssens, R.V.F., Carpenter, M.P., Zhu, S. and Barton III, C.J. (2006) Stabilization of Nuclear Isovector Valence-Shell Excitations. Physical Review Letters, 96 (12). pp. 122501-1. ISSN 1079-7114

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Excited states in 138Ce have been studied via the 12C(138Ce,138Ce*) Coulomb excitation reaction at 480 MeV. Relative cross sections have been determined from the gamma-ray yields observed with Gammasphere. The E2 and M1 strength distributions between the lowest six 2+ states up to 2.7 MeV enables us to identify the 2<sub>4</sub><sup>+</sup> state in 138Ce as the dominant fragment of the one-phonon 2<sub>1,ms</sub><sup>+</sup> mixed-symmetry state. Mixing between this level and a nearby isoscalar state is observed and is more than 4 times larger than in the neighboring isotone 136Ba. This is direct evidence that the stability of mixed-symmetry states strongly depends on the underlying subshell structure.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 24 Feb 2009 10:41
Last Modified: 24 Feb 2009 10:41
Published Version: http://dx.doi.org/10.1103/PhysRevLett.96.122501
Status: Published
Publisher: The American Physical Society.
Identification Number: 10.1103/PhysRevLett.96.122501
URI: http://eprints.whiterose.ac.uk/id/eprint/7247

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