The rms charge radius of /sup 3/He was measured to be 1.90 +- 0.05 fm by means of low momentum transfer electron scattering at the National Bureau of Standards. A report to be submitted for publication is being prepared. In July a fifth (e, e') spectrum was measured at NBS for the /sup 20/Ne giant resonance region. The analysis of /sup 20/Ne data without the need of an arbitrary quasielastic continuum contribution is completed. The region between the neutron and proton thresholds is dominantly of electric quadrupole character, and that above the proton threshold of electric dipole character. Form factors were extracted. Magnetic elastic scattering was measured for /sup 25/Mg at the Bates Electron Linear Accelerator of Middleton, Massachusetts. A fixed scattering angle of 160/sup 0/, and electron energies between 140 and 270 MeV were used. The ground state M5 form factors were extracted after corrections were made for Coulomb scattering contributions at 160/sup 0/. Forward-angle data taken at Mainz, Germany in a U. Mass.-Mainz collaborative experiment were used in making these corrections and in extracting C2, and for the first time, C4 moments. At the I.K.O. laboratory of Amsterdam, The Netherlands, M1 and some M3 form factor points were measured. Thus information on form factors of all possible multipoles was obtained.

This report summarizes progress during the past year in the following areas of nuclear structure and reaction theory: Meson interactions with nucleons and nuclei, including elastic and inelastic scattering of pions, three-body theories of scattering and absorption of pions by deuterons, .pi.-p bremsstrahlung, and multiple-excitation models for meson absorption by heavier nuclei. Studies of the inverse scattering problem including 1S° nucleon-nucleon scattering; the relativistic two-body problem, particularly for relativistic effects at low energies: the unitary-pole expansion in nucleon-nucleon scattering with hard-core interactions. Statistical spectroscopy including: strength distributions and sum rules(both energy weighted and inverse energy weighted) for nuclear excitations; fluctuations and correlations in spectra, strengths and expectation values; studies of Garvey-Kelson and similar mass relationships; spectroscopy in huge spaces including spectral methods for renormalization of the interaction and for using (two + three)-body Skyrme interactions; technical aspects of operator averaging.