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The decay pattern of the Pygmy Dipole Resonance of 140Ce
oleh: B. Löher, D. Savran, T. Aumann, J. Beller, M. Bhike, N. Cooper, V. Derya, M. Duchêne, J. Endres, A. Hennig, P. Humby, J. Isaak, J.H. Kelley, M. Knörzer, N. Pietralla, V.Yu. Ponomarev, C. Romig, M. Scheck, H. Scheit, J. Silva, A.P. Tonchev, W. Tornow, F. Wamers, H. Weller, V. Werner, A. Zilges
Format: | Article |
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Diterbitkan: | Elsevier 2016-05-01 |
Deskripsi
The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N=82 nucleus 140Ce using a novel combination of nuclear resonance fluorescence and γ–γ coincidence techniques. Branching ratios for transitions to low-lying excited states are determined in a direct and model-independent way both for individual excited states and for excitation energy intervals. Comparison of the experimental results to microscopic calculations in the quasi-particle phonon model exhibits an excellent agreement, supporting the observation that the Pygmy Dipole Resonance couples to the ground state as well as to low-lying excited states. A 10% mixing of the PDR and the [21+×PDR] is extracted.