Abstract
The charge (mass) distributions of fission fragments resulting from low- and high-energy fission of the isotopes of Fm and No are studied with the statistical scission-point fission model. The calculated results are compared with the available experimental data. The transformation of the shape of the charge distribution with increasing isospin and excitation energy occurs gradually. At some critical excitation energy the the saturation of the symmetric component of the charge (mass) yield is demonstrated.
Highlights
The mass distributions in low-energy fission of nuclei U– Cf are known to be mostly asymmetric [1]
The thermal-neutron-induced fission of 256,257Fm [1] leads to the symmetric mass distribution, but with larger width than that in spontaneous fission of 258Fm
(Figs. 3-4), the symmetric mass-yields are larger than the asymmetric mass-yields that is in a good agreement with the experimental data [3]
Summary
The mass distributions in low-energy fission of nuclei U– Cf are known to be mostly asymmetric [1]. The first observation of the onset of symmetric distribution was made in the spontaneous fission of 257Fm [1, 2]. For 258Fm, the spontaneous fission results in the unexpected narrow symmetric mass distribution [3]. The symmetric distributions have been observed in the spontaneous fission of 259Fm, 259,260Md, 258,262No, and 259Lr [1]. A survey of literature reveals a lack of data on the charge distributions of fission products in the spontaneous and induced fission of Fm and No as a function of isospin and excitation energy
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