Abstract
The relative fission cross-section of235U has been measured up to 200 keV with a nominal resolution of 1.0 ns/m. The data have been analysed in order to detect nonstatistical effects due to intermediate structure. The statistical tests which have been applied to this fission and similar total-cross-section data include calculation of the correlation serial coefficients, variance and Wald-Wolfwitz tests. The comparison of the results indicates the presence of intermediate-structure effects in fission cross-section which may be interpreted on the basis of the double-humped deformation potential. Under the assumption that the first not fully open channel is theKπ=2-, the energies of the outer barrier and of the shape isomer of this transition state are obtained.
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