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
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.
|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|
|Publisher:||The American Physical Society.|