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Physical Review Letters 109 (2012) 162503
Observation of Large Scissors Resonance Strength in Actinides
M. Guttormsen, L. A. Bernstein, A. Bürger, A. Görgen, F. Gunsing1, T. W. Hagen, A. C. Larsen, T. Renstrøm, S. Siem, M. Wiedeking, J. N. Wilson2

The orbital M1 scissors resonance has been measured for the first time in the quasicontinuum of actinides. Particle-γ coincidences are recorded with deuteron and 3He-induced reactions on 232Th. The residual nuclei 231,232,233Th and 232,233 Pa show an unexpectedly strong integrated strength of BM1=11-15μn2 in the Eγ=1.0-3.5 MeV region. The increased γ-decay probability in actinides due to scissors resonance is important for cross-section calculations for future fuel cycles of fast nuclear reactors and may also have an impact on stellar nucleosynthesis.
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Physique Nucléaire Expérimentale