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Landau-Zener effect in fission

Abstract : A model that takes into account the Landau-Zener promotion mechanism during fission was developed recently. The structures observed in the subthreshold neutron-induced fission of 232Th are investigated employing this model. Theoretical single-particle excitations of a phenomenological two-humped barrier are determined by solving a system of coupled differential equations for the motion along the optimal fission path. A rather good agreement with experimental data is obtained using a small number of independent parameters. It is predicted that the structure at 1.4 and 1.6 MeV is mainly dominated by a spin 3/2 partial cross section with a small admixture of spin 1/2, while the structure at 1.7 MeV is given by a large partial cross section of spin 5/2.
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Submitted on : Monday, February 4, 2008 - 3:15:27 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:53 PM

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M. Mirea, L. Tassan-Got, C. Stephan, C. O. Bacri, R. C. Bobulescu. Landau-Zener effect in fission. Physical Review C, American Physical Society, 2007, 76, pp.064608. ⟨10.1103/PhysRevC.76.064608⟩. ⟨in2p3-00238450⟩

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