By André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.)
In the current quantity and within the previous one we've got stretched our basic trend of studies by way of together with articles of extra significant proportions than any we've released ahead of. thus each one of those vol umes comprises in basic terms 3 evaluate articles. From the start of this sequence it's been our target, as editors, to accomplish edition within the scope, sort, and size of person articles adequate to check the wishes of the person subject, instead of to restrain the authors inside of inflexible limits. We consider that the 2 significant articles of Vols. five and six are totally justified and don't repre despatched pointless exuberance at the a part of the authors. the item through Michaudon on fission is the 1st entire 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 go 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 energy of nuclear physics lies within the mix of creative experiments with easy ideas.
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Extra info for Advances in Nuclear Physics: Volume 6
Kinetic energy of the fission fragments. This energy results from the Coulomb repulsion of the fragments at scission and is therefore determined by the scission configuration which varies with the type of fragmentation. For example, it has been shown that for fission induced by thermal neutrons in 235U, the kinetic energy at symmetric division is definitely smaller than for asymmetric fission (see, for example, VTO 59, MF 62). Estimates of this difference vary from more than 30 MeV in early results (MF 62, TGS 65) to about 21 MeV in more recent results (SRN 67).
5, may provide a more accurate knowledge of the fission path and show that, in its final stage, fission becomes asymmetric (MN 70). Nevertheless, though essentially asymmetric, for still not very clear reasons the mass distribution of the fission fragments may be slightly influenced by the symmetry properties of the transition states. For example, the peak-to-valley ratio of this distribution may be larger for octupole vibrational states (which are asymmetric) than for quadrupole vibrational states (which are symmetric).
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.
Advances in Nuclear Physics: Volume 6 by André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.)