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Observation of Large Scissors Resonance Strength in Actinides

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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Submitted on : Tuesday, December 11, 2012 - 10:55:17 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:29 PM

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M. Guttormsen, L.A. Bernstein, A. Bürger, A. Görgen, F. Gunsing, et al.. Observation of Large Scissors Resonance Strength in Actinides. Physical Review Letters, American Physical Society, 2012, 109, pp.162503. ⟨10.1103/PhysRevLett.109.162503⟩. ⟨in2p3-00763610⟩

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