Abstract
The yields of Kr (A = 87–93) and Xe (A = 138–143) primary fission fragments produced in 232Th, 238U, and 244Pu photofission upon the scission of a target nucleus and neutron emission were measured in an experiment with bremsstrahlung from electrons accelerated to 25 MeV by a microtron, and the results of these measurements are presented. The experimental procedure used involved the transportation of fragments that escaped from the target by a gas flow through a capillary and the condensation of Kr and Xe inert gases in a cryostat at liquid-nitrogen temperature. The fragments of all other elements were retained with a filter at the capillary inlet. The isotopes of Kr and Xe were identified by the γ spectra of their daughter products. The mass-number distributions of the independent yields of Kr and Xe isotopes are obtained and compared with similar data on fission induced by thermal and fast neutrons; the shifts of the fragment charges with respect to the undistorted charge distribution are determined. Prospects for using photofission fragments in studying the structure of highly neutron-rich nuclei are discussed.
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Translated from Yadernaya Fizika, Vol. 66, No. 7, 2003, pp. 1251–1258.
Original Russian Text Copyright © 2003 by Gangrsky, Zhemenik, Maslova, Mishinsky, Penionzhkevich, Szöllös.
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Gangrsky, Y.P., Zhemenik, V.I., Maslova, N.Y. et al. Independent yields of Kr and Xe isotopes in the photofission of heavy nuclei. Phys. Atom. Nuclei 66, 1211–1218 (2003). https://doi.org/10.1134/1.1592574
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DOI: https://doi.org/10.1134/1.1592574