β Scribed by B.P. Bannik; N.M. Kulikova; L.E. Lazareva; V.A. Yakovlev
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Measurements of the angular distribution of photofission fragments from uranium have been made using the X-ray beam of the 30 MeV synchrotron.
Nuclear plates 100p and 200p thick impregnated with a saturated solution of uranium acetate were placed along the X-ray beam at a distance of 1 m from the target. The irradiations were carried out at three synchrotron energies: 9.4 MeV, 12 MeV and 26.5 MeV. In the course of examining the plates only tracks of fission fragments with a dip angle of ~ 15 Β° were selected. Since the point of separation of fragments was not fixed the angular distribution [Y(0) + Y(~ --~)] was determined. The observed angular distribution for-2ssu is anisofropic with a maximum at right angles to the X-ray beam. The amount of the anisotropy increases with decreasing photon energy. In the case of uranium the anisotropy is considerably less than for the photofission of thorium 1).
The angular distribution obtained at 9.4 MeV has the form a + b sin 2 0 + c sin 9 ~ cos 9 O, which points to a considerable relative increase of quadrupole absorptions at energies less than 10 MeV. l) W i n h o l d , E.J., Demos, P.T. and H a l p e r n , L., Phys. Rev. 87(1953) 1139. 122. P h o t o f i s s i o n of 2SSu and 2S2Th. R.
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