Observation of Large Scissors Resonance Strength in Actinides

Guttormsen, Magne Sveen; Bernstein, Lee; Bürger, Alexander; Görgen, Andreas; Gunsing, Frank; Hagen, Trine Wiborg; Larsen, Ann-Cecilie; Renstrøm, Therese; Siem, Sunniva; Wiedeking, Mathis; Wilson, Jonathan
Journal article; PublishedVersion; Peer reviewed
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Year
2012
Permanent link
http://urn.nb.no/URN:NBN:no-59778

CRIStin
951730

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Original version
Physical Review Letters. 2012, 109 (16):162503, DOI: http://dx.doi.org/10.1103/PhysRevLett.109.162503
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=11–15μ2n 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.

© 2012 American Physical Society