By Reines, F.; Los Alamos National Laboratory.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information
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BE411973A), France (patent no. FR796795A), Germany (patent no. s CA407558A, CA407559A, CA552312A, CA552693A, CA619065A, CA620923A). S. patents, this motivating our choice. The major effort we have made to carefully check and type all equations and tables was motivated by our desire to facilitate the reading of Fermi’s unpublished papers as much as possible. However, we have tried to keep as much as possible the original editing, this holding, in particular, for sectioning and equations (especially in Part 2, however, for a better understanding we have introduced some punctuation marks).
The shape of a resonance curve, as observed for an (n, γ) process, like that of an atomic spectral line, is like a bell, and can be characterized by its height and by its width at half the peak value. The width is marked as ∆E in Fig. 1, and for most γ-rays is about 1 eV. Now by the Uncertainty Principle, this degree of definition in energy is associated with a corresponding definition in time, namely ∆E · ∆t ∼ h . 6 · 10 ergs, one finds ∆t ∼ 5 · 10−15 s. By analogy with atomic spectra, again, we may say that this represents the time it 25 master May 10, 2010 13:49 World Scientific Book - 9in x 6in 26 master Neutron Physics for Nuclear Reactors ΣE E E Fig.
3@ Here and in the following, the author uses this compact form for endo-energetic. 1 The Isotopic Chart This consists of an array of squares, each representing an isotope. The ordinate is N and the abscissas Z. A given mass number A = N + Z is thus shown as a line at 135o to the Z axis. (See Fig. 1). The line, or rather the band, representing the known isotopes, has an initial slope of 45o and then curves upward as shown. The chart provides one of the most convenient means of presenting collected data on nuclear transitions.