- Conference date: 4-9 September 2005
- Location: Notre Dame, Indiana (USA)
Gamma‐rays from the nuclide 138Ce have been measured with the Gammasphere‐array following Coulomb excitation. Beams of 138Ce ions were focussed on a carbon target at beam energies of 480 and 400 MeV. Gamma‐ray yields and relative Coulomb excitation cross sections were measured in singles‐mode. M1, E2, and E3 transition matrix elements from low‐spin states were measured relative to the known . The M1 strength distribution from the lowest six 2+ states up to 2.7 MeV enables us to identify the state of 138Ce as the dominant fragment of the one‐phonon mixed‐symmetry state with F‐spin quantum number F max − 1. From its mixing with the nearby state an F‐spin mixing matrix element of 44 keV can be estimated.
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