Download Advances in Nuclear Physics: Volume 6 by André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.) PDF

By André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.)

In the current quantity and within the previous one we now have stretched our general trend of reports via together with articles of extra significant proportions than any we have now released ahead of. therefore each one of those vol­ umes includes purely 3 assessment articles. From the start of this sequence it's been our target, as editors, to accomplish version within the scope, variety, and size of person articles adequate to compare the wishes of the person subject, instead of to restrain the authors inside inflexible limits. We believe that the 2 significant articles of Vols. five and six are fullyyt justified and don't repre­ despatched pointless exuberance at the a part of the authors. the object via Michaudon on fission is the 1st entire account of the advancements during this topic, that have positioned it within the middle of the level of nuclear physics up to now few years. the invention of fission isomerism and its dramatic manifestations within the intermediate constitution of the neutron pass sections for fissionable isotopes are one of the so much im­ portant and fascinating occasions to take place in nuclear physics. those occasions got here as a shock, and reaffirmed that the power of nuclear physics lies within the mix of creative experiments with uncomplicated ideas.

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By radiochemical analysis, the valley-to-peak ratio of the mass distribution, or more exactly the 115CdJ99Mo ratio, R, was obtained 44 Andre Michaudon for more than twenty resonances with energies ranging from 15 to 82 eV. The raw values of R have rather large fluctuations with a modal yield of 1l5Cd ranging from i to ! the thermal yield. After correction for background and for the contribution of neighboring resonances, it is possible to obtain significant values of R for strong resonances. As can be observed in Fig.

23. This plot is similar to that drawn by G. A. Cowan (Cow+ 66), but with more recent values of the fission widths (Blo+ 70, Der 70). Variations of the total kinetic energy of the fission fragments were observed and they can also be correlated with the spin states and the variations of R in the way predicted by the theory of Bohr (MM 65). The average number ji of prompt fission neutrons emitted in the resonances was also measured in several laboratories. I. (WWH 69) and Dubna (Sha 68). I. variations are opposite to those of Dubna (Fig.

Fraser and J. C. D. Milton (FM 66)]. 2. Fission Widths of the Resonances The fission widths are obtained from the analysis of slow-neutron cross sections of fissile nuclei which are composed in most cases of sharp and well-separated resonances typical of a reaction via the formation of a compound nucleus. Such cross sections can be measured with great accuracy by the time-of-flight method using the intense and short neutron bursts now available with pulsed neutron sources. As an example, Fig. 17 shows the 239PU fission cross section measured with a nominal resolution of 1 nsec/m using the Saclay 45 MeV electron linear accelerator as a pulsed-neutron source (BDM 70).

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