Download e-book for iPad: Advances in Nuclear Physics: Volume 6 by André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.)

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

ISBN-10: 1461590418

ISBN-13: 9781461590415

ISBN-10: 1461590434

ISBN-13: 9781461590439

In the current quantity and within the previous one we've stretched our common development of reports by way of together with articles of extra significant proportions than any now we have released earlier than. in this case each one of those vol­ umes comprises merely 3 assessment articles. From the start of this sequence it's been our target, as editors, to accomplish edition within the scope, type, and size of person articles enough to check the desires of the person subject, instead of to restrain the authors inside of inflexible limits. We think 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 item by means of Michaudon on fission is the 1st accomplished account of the advancements during this topic, that have put it within the heart 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 move sections for fissionable isotopes are one of the so much im­ portant and engaging occasions to happen in nuclear physics. those occasions got here as a shock, and reaffirmed that the power of nuclear physics lies within the mixture of inventive experiments with easy ideas.

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6 MeV below the neutron separation energy. 38 Andre Michaudon In the same manner as for 239PU, the fission widths of 23 5 U resonances were extracted by single-level analysis of the total and fission cross sections measured with samples cooled down to liquid nitrogen temperature (Mic+ 65, BDM 70). The integral distribution of these fission widths is plotted in Fig. 20 for 134 resonances analyzed below 150 eV. This experimental distribution can be fitted with one single X2 law of the type in Eq.

The mass distribution of the fission products was measured by the "wheel technique," using a nuclear explosion as a pulsed-neutron source (Cow+ 66). 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.

Iv. Emission probability and energy spectrum of long-range ex particles in ternary fission. Though the evidence is not as conclusive as for neutron emission, it seems that the emission probability of long-range ex particles varies as function of the fragment mass number (Sch+ 62). Therefore, as for the other fission properties discussed above, it should aso be sensitive to the symmetry properties of the transition states. v. Angular distribution of the fission fragments. As will be discussed later in the case of 235U neutron-induced fission, the angular distribution of the fission fragments can provide interesting information about the transition states when fission is induced by non polarized slow neutrons in oriented fissile nuclei (DWP 65).

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

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