By Baker S. G.

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Extra info for A sensitivity analysis for nonrandomly missing categorical data arising from a national health disab

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In this energy range, the resolved-resonance region, the fission cross-section is composed of many sharp and closely-spaced peaks, called resonances, as illustrated in Fig. 19 for Pu. Similar resolved resonances also appear in the fission cross-sections of non-fissile nuclei, such as U, but with a much smaller amplitude as a result of the low value of the fission barrier penetrability. The existence of such narrow slow-neutron resonances demonstrates that the interaction of slow neutrons with nuclei proceeds essentially through the formation of compound-nucleus states, as expected since the associated de Broglie wavelength of slow neutrons is larger than the nuclear dimensions.

These fluctuations decrease rapidly in amplitude with increasing energy until the cross-section becomes smoothly varying. G). 2 in terms of the energy differences (S - E f ) of the compound nuclei, and of the even-odd N numbers of the target nuclei. But, in addition to these effects, fairly large fluctuations are observed from one nucleus to another even if these nuclei have similar values of the energy difference (S - E ) . These fluctuations can easily be explained by considering that in the single-level approximation the fission cross-section is just the sum of all contributions of the various resonances at thermal-neutron energy.

This concept of exit channel can be applied to fission for the fragment pairs formed at scission, but one is led then to an extremely large number of fission exit channels (10 or more) with the consequence that the fission widths should be constant from resonance to resonance. This is not observed in the experimental results, which on the contrary, show large fluctuations^compatible with a few fission exit channels, as is illustrated in Fig. 22 for U; Also, level-level interference is observed in fission Fig.

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