Abstract
The cross-section ratio of 134Cs and 134 m Cs has been measured for fission of 233U, 235U and 238U induced by helium ions of 27–42 MeV, for fission of 237Np induced by deuterons of 21 MeV and for fission of 233U induced by γ-rays with an energy of up to 16 MeV. Comparison of the results with calculations based on a statistical theory of the spin distribution of level densities in excited nuclei shows that in the case of low angular momentum of the fissioning nucleus (γ-ray induced fission) the fragments are produced with a mean intrinsic angular momentum which is larger than the angular momentum of the fissioning nucleus. The isomer ratio results also show that when the angular momentum of the fissioning nucleus is increased (helium-ion-induced) this is at least partially transferred into additional intrinsic angular momentum of the fragment. Measurements of the angular dependence of the isomer ratio revealed no significant differences between the isomer ratio at 90° and at 170°. The half-life of 134 m Cs has been remeasured and found to be 2·91 ± 0·02 hr in agreement with earlier results.
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