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The “meson presence in nuclei” is discussed. Exchange-current corrections to nuclear magnetic g-factors can be connected to the local effective mass by $$\delta g_l (r) = - \frac{1}{3}\{ 1 - \tfrac{m}{{m*}}(r)\} \tau _3 \circ$$ Exchange-current contributions to ℛ, the enhancement of the dipole sum rule, are discussed. It is pointed out that the present, quite successful, theory of...
Experimental form factors for electron scattering from ground state magnetization distributions allow the determination of magnetic muztipoze moments and of radii of valence nucleon orbits. Recently obtained data are compared with theoretical predictions, which comprise Coulomb distortion, Woods-Saxon wave functions, configuration mixing and meson exchange currents.
A review is given of elastic electron scattering at large momentum transfer (Q2 > 20 fm−2) from nuclei with A ≤ 4. Recent experimental results are reviewed and the current problems in our interpretation of these results are pointed out. Some questions for future experiments are posed, and a preview of possible future measurements is presented.
Single hole state momentum and energy distributions are obtained from (e,e'p) experiments. Together with some recent results on 160 and 9Be, several problems in the data interpretation are discussed like the validity of the usual distortion corrections, the importance of rescattering effects, the shape and widths of the energy distributions and the energy weighted sum rule. A recent measurement of...
For heavy nuclei, the sum of all the partial photoneutron cross-sections gives a reasonable approximation of the total photonuclear cross-section. Such partial photoneutron cross-sections were measured at Saclay with quasi monochromatic photons produced by the in-flight-annihilation of positrons. Measurements from 30 to 120 MeV allow a comparison of σ(γ,TOTAL) with the various quasi-deuteron models...
We describe the main design characteristics of a proposed superconducting recyclotron for electrons with a variable energy from 1o to a maximum of 13o MeV, a duty cycle of 1oo% and an energy spread of 2▪10−4 at maximum energy. The 3 GHz superconducting accelerating units, which are the main building blocks for the 4o MeV linac and the 1o MeV injector, are of a design which is expected to be free of...
The present duty factor of the 400 MeV Frascati National Laboratories Linac (8x10−4) can be made to approach unity by using an electron storage ring as a pulse stretcher: resonant extraction near an m/3 resonance by means of sextupolar nonlinearities in the ring allows slow extraction of the stored current with small energy spread. The feasibility of a machine,capable of 100µA average current and...
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