https://doi.org/10.1051/epjconf/20146602044
Scissors strength in the quasi-continuum of actinides
1 Department of Physics, University of Oslo, N-0316 Oslo, Norway
2 Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550-9234, USA
3 CEA Saclay, DSM/Irfu/SPhN, F-91191 Gif-sur-Yvette Cedex, France
4 iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa
5 Institut de Physique Nucleaire d’Orsay, Bat. 100, 15 rue G. Glemenceau, 91406 Orsay Cedex, France
a e-mail: magne.guttormsen@fys.uio.no
Published online: 20 March 2014
The M1-scissors resonance has been measured for the first time in the quasi-continuum of actinides. The strength and position of the resonances in 231,232,233Th were determined by particle-γ coincidences using deuteron induced reactions on a 232Th target. The residual nuclei show a strong integrated strength of BM1 = 9 − 11 µn2 in the Eγ = 1.0 − 3.5 MeV region. The presence of the scissors resonance modifies significantly the (n,γ) cross section, which has impact on fuel-cycle simulations of fast nuclear reactors and nucleosynthesis in explosive stellar environments.
© Owned by the authors, published by EDP Sciences, 2014
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