[en] This patent describes a method for detecting explosive materials in a target, the explosive materials containing characteristically large or small amounts of one or more nuclear species of interest. It comprises resonantly exciting nuclei of the target with a beam of bremsstrahlung radiation, resonantly exciting nuclei of one or more reference scatterers with the beam of bremsstrahlung radiation transmitted through the target, each the reference scatterer comprising one or more of the nuclear species of interest, measuring the intensity of photons at energies of interest scattered from each the reference scatterer in a direction or directions, the energies of interest for each reference scatterer corresponding to the spacings between the quantized energy states of the nuclear species of interest of which the reference scatterer is comprised, and estimating the abundance of each nuclear species of interest in the target from the measured intensity of photons scattered from the reference scatterer or scatterers comprising the nuclear species

[en] Experimental nuclear physics is reviewed. Included are electron scattering, photon reactions, correlations in nuclei, positrons, neutrons, and mesons in nuclear physics

No abstract available

[en] We are constructing a polarized electron source in order to study parity violation in elastic electron-carbon scattering at the MIT Bates Linac. The source uses a GaAs photocathode illuminated by light from an infrared krypton ion laser. Our design, which uses a multi-chamber vacuum system, meets the special requirements for operation at Bates

[en] Some examples of developments in the field of inelastic electron scattering are given including the physics of this study, an application of electromagnetic transition densities to beta decay, negative muon capture, and positive pion photoproduction in lithium-6 and helium-6, giant resonances, vibrational states in zinc-64, -66, and -68, shapes of deformed nuclei, recent results from Saclay on chromium-52, and recent results from MIT

[en] Within the regime of direct reactions mediated by local one-body operators, common probes are sensitive to sets of nuclear densities with a large degree of overlap. The reliability of the direct reaction mechanisms for several medium energy probes was verified by phenomenological studies of the 4^- states of ¹⁶O and of the octupole states of ¹⁷O. However, it was also concluded that while electron scattering may be considered a quantitative probe, its exclusive use can produce misleading structure conclusions. A comparative study of the 4^- states produced a consistent picture of the isospin composition and particle-hole content somewhat at variance with the natural conclusions that might have been drawn from electron scattering alone. A comparison of (e,e') and (p,p') in case for which (e,e') fully specified the require nuclear structure was used to study the two-nucleon effective interaction in the nuclear medium. It was found that the isocalar spin-independent central component of the two-nucleon effective interaction near 150 MeV is strongly dependent upon the local density in the vicinity of the interaction. We also note that the success of the local density approximation holds great promise for the study of the basic two-nucleon interaction. Finally, we have exploited the nonuniform radial sensitivity of the density dependent two-nucleon effective interaction to distinguish between interior and surface modes of excitation

[en] Results of electron scattering experiments on ¹⁶O, ¹⁹F, ²⁷Al, ¹⁸¹Ta, ²⁵Mg, ²⁴Mg, ²⁰⁷Pb and on deformed nuclei ¹⁵²Sm, ¹⁵⁴Sm, ¹⁶⁶Er, ¹⁷⁶Yb, ²³²Th, ²³⁸U, ¹⁵⁰Nd, ¹⁵⁶Gd are discussed. Photo-pion studies on ¹²C and deuterium and photo-proton studies on ¹⁶O are presented. (BJ)

[en] A method has been devised for interpreting electron scattering data from three 2+ levels in ¹⁵⁴Gd to test the assumptions of the interacting boson approximation. The plane wave form factor is shown to be the relevant quantity in the test. The Hartree-Fock charge distribution is used as an example of the analysis technique. Experimental work is in progress at the MIT-Bates Laboratory. 4 figures

No abstract available

[en] It is stated that because the electromagnetic interaction is sufficiently weak that it does not unduly disrupt a nuclear target, electromagnetic probes provide unambiguous quantitative information regarding the spatial distribution of the nuclear wave function. They represent a new generation of experimental techniques, now coming into operation, that will greatly increase the variety and quality of results. Three applications of this new technique are described - application to (e,e'p) and (γ,p) reactions, application to inelastic electron scattering from rotational nuclei; and application to magnetic scattering. High-q probes of few-body systems are also discussed. (U.K.)