Investigation of dipole excitations in 142Ce using resonant photon scattering

A. Gade, N. Pietralla, P. von Brentano, D. Belic, C. Fransen, U. Kneissl, C. Kohstall, A. Linnemann, H.H. Pitz, M. Scheck, N.A. Smirnova, F. Stedile, V. Werner

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A photon scattering experiment with bremsstrahlung has been performed on the vibrational nucleus 142Ce up to a photon endpoint energy of 4.1MeV. Fourteen dipole excitations have been observed between 2.1 and 3.9MeV, five of them for the first time. A candidate for the 1−dipole member of the recently proposed quintuplet of negative parity (2+1,ms⊗3−1)(J−), involving the 2+1,ms
isovector quadrupole excitation in the valence shell, has been identified. This exotic 1−msstate has been predicted within the sdf-IBM-2 and is expected to be accessible to photon scattering measurements. Solely one of nine J=1 states in the energy region of interest shows a decay pattern compatible with the model predictions for the 1−ms state.
Original languageEnglish
Article number054321
JournalPhysical Review C
Issue number5
Publication statusPublished - May 2004
Externally publishedYes


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