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

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

In the current quantity and within the previous one we've got stretched our basic development of studies via together with articles of extra significant proportions than any we now have released ahead of. hence each one of those vol­ umes comprises purely 3 overview articles. From the start of this sequence it's been our objective, as editors, to accomplish version within the scope, kind, and size of person articles adequate to compare the desires of the person subject, instead of to restrain the authors inside of inflexible limits. We suppose that the 2 significant articles of Vols. five and six are completely justified and don't repre­ despatched pointless exuberance at the a part of the authors. the thing via Michaudon on fission is the 1st complete account of the advancements during this topic, that have positioned it within the heart of the level of nuclear physics in past times 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 engaging occasions to ensue in nuclear physics. those occasions got here as a shock, and reaffirmed that the power of nuclear physics lies within the blend of creative experiments with basic ideas.

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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). The measured resonances are broadened by instrumental resolution and by the Doppler effect resulting from the thermal motion of the nuclei in the sample. In high-resolution measurements, such as those of Fig. , in the region where the resonances are best separated and where they can be individually analyzed. This is why the Saclay measurements were carried out with the fissile sample at liquid nitrogen temperature.

Cowan at neutron resonances (Cow+ 66), is plotted as a function of resonance energy. The spins J = 0 or J = 1 of the resonances, as determined and compiled by J. Trochon (Tro+ 70), are indicated near the plotted value of R. ), are deduced only from the large fission width of the resonance. There seems to be a clear separation of the resonances (with two exceptions) into two groups corresponding to the two spin states. 45 Nuclear Fission N GROUP I 10 Ii leV) N GROUP II 2 If leV) Fig. 24. Frequency distributions of the T f values for the two groups of 239PU resonances, as they appear in Fig.

8 and this plot actually shows a rough decrease of T~! for increasing Z2/A. Nevertheless, there are rather important deviations from this general trend: 1. For a given series of even-even isotopes, the plot of T~! versus Z2/A goes through a maximum (Hui 54) instead of decreasing regularly, as predicted by the LDM. The curvature of the plot is more pronounced for the heavier elements. 2. The rate of decay by spontaneous fission is systematically larger for even-odd isotopes than for the neighboring even-even ones (Sea 52, WG 52) as can be observed in Fig.

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