Describing T-odd asymmetries for α-particles in the ternary fission of actinide nuclei

Abstract

A version of a unified quantum-mechanical description of the nature of T-odd TRI and ROT asymmetries due to the effect of the collective rotation of a polarized nucleus splitting into even and odd components of the angular distribution amplitude of prescission α particles emitted in the ternary fission of nuclei by cold polarized neutrons is considered. Reasonable agreement between the angular dependences of the calculated and experimental coefficients of T-odd asymmetry for 235U and 239Pu nuclei is demonstrated, allowing for the interference of the fission amplitudes of neutron resonances excited in the fissile nucleus during the trapping of an incident neutron by a target nucleus. Consideration of the rather high experimental error in detecting the emission angle of light fission fragments is shown to improve the agreement between the calculated and experimental coefficients of T-odd asymmetry for a 233U target nucleus, in which T asymmetry plays a key role.