Standard Modes of Thorium Fission

A. A. Goverdovski and V. F. Mitrofanov

State Research Center Institute of Physics and Power Engineering, Obninsk, Kaluga oblast, 249020 Russia

Received November 20, 1996; in final form, April 25, 1997

Abstract—The mass distributions of fission fragments from the reaction ²³²Th(n, f) are studied in the neutron-
energy range from 1.14 MeV to 3.5 MeV. The probabilities of the standard-valley population are found to be
strongly correlated with the resonances of the fission cross section. The mass mode in the region of m = 140 amu
(the second standard mode) can be realized only via the K = 1/2 rotational band, whereas the first standard mode
(m 134 amu) can be associated with the K = 1/2 and K = 3/2 bands.

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