Observation of Large Scissors Resonance Strength in Actinides
- Guttormsen, M.
- Bernstein, L.A.
- Bürger, A.
- Görgen, A.
- Gunsing, F.
- W. Hagen, T.
- C. Larsen, A.
- Renstrøm, T.
- Siem, S.
- Wiedeking, M.
- N. Wilson, J.
Publication date
January 2012
DOI Publisher
American Physical Society (APS)Abstract
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
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