T-odd asymmetries for evaporation neutrons in nuclear fission.

Autor: Kadmenskii, S., Lyubashevskii, D.
Zdroj: Bulletin of the Russian Academy of Sciences: Physics; Apr2010, Vol. 74 Issue 4, p528-530, 3p
Abstrakt: T-odd asymmetries in the angular distributions of evaporation neutrons emitted by thermalized fission fragments in the fission of axially symmetric deformed nuclei by cold polarized neutrons are investigated within the quantum theory of fission. The asymmetries in question are due to the anisotropy of angular distributions of evaporation neutrons in the center-of-mass systems of the fission fragments, and this anisotropy arises from the orientation of large-value fission fragment spins in the direction perpendicular to the direction K0 of the symmetry axis of the fissioning nucleus at the time of its scission, caused by zero wriggling vibrations of the fissioning nucleus. The angle of rotation of the vector k0 with respect to the asymptotic direction k0 of the fissioning nucleus symmetry axis is calculated with allowance for the interference of fission amplitudes of neutron resonances excited in a fissioning nucleus as it captures an incident neutron. It is shown that the T-odd asymmetry coefficient for evaporation neutrons is close in structure and value to the analogous coefficient for evaporation γ-rays. [ABSTRACT FROM AUTHOR]
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