Observation of large scissors resonance strength in actinides
M. Guttormsen, L. A. Bernstein, A. B\"urger, A. G\"orgen, F. Gunsing,, T. W. Hagen, A. C. Larsen, T. Renstr{\o}m, S. Siem, M. Wiedeking, and J. N., Wilson
TL;DR
This study reports the first measurement of the orbital M1-scissors resonance in actinides, revealing unexpectedly strong resonance strength that influences nuclear reaction rates relevant for reactors and astrophysics.
Contribution
First experimental observation of large scissors resonance strength in actinides using particle-gamma coincidence techniques.
Findings
Strong M1-scissors resonance observed in actinides
Resonance strength measured as 11-15 μN² in 1.0-3.5 MeV range
Implications for nuclear reaction modeling in reactors and stars
Abstract
The orbital M1-scissors resonance (SR) has been measured for the first time in the quasi-continuum of actinides. Particle-gamma coincidences are recorded with deuteron and 3He induced reactions on 232Th. The residual nuclei 231,232,233Th and 232,233Pa show an unexpectedly strong integrated strength of in the Egamma=1.0 - 3.5 MeV region. The increased gamma-decay probability in actinides due to the SR is important for cross-section calculations for future fuel cycles of fast nuclear reactors and may also have impact on stellar nucleosynthesis.
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