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The electric and magnetic form factors of the proton and neutron are derived theoretically as functions of the momentum transfer invariant (q/sup 2/). It is proposed that the proton and nucleon are two aspects of the nucleon, which differ only in isctopic spin. The neutron and proton form factors are accordingly divided into scalar and vector parts, and the effects of core charges and Yukawa clouds are discussed. It is noted that the neutron electric form factor is positive, thus requiring a pcsitive outer fringe of charge for the neutron. (T.F.H.)

New information is reported on differences between the charge distributions of Ca40 and of Ca44, obtained by means of elastic scattering of 250 MeV electrons. Attention is focused, experimentally and theoretically, on the difference in scattering between the two isotopes.

Separate proton form factors were obtained from electron scattering studies by choosing a pair of experimentally measured cross sections at the same value for the square of the momentum transfer but at different values of electron energy and scattering angle. The proton form factors obtained were plotted against the square of the momentum transfer. The new F/sub 2/ indicated that the Pauli magnetic moment cloud is a spread-out distribution. The constancy of F, however, suggested that the Dirac electric/magnetic cloud has a small, perhaps point-like, core. (M.C.G.)

Mechanical, or sound, vibrations were observed in ceramic piezoelectric disks of lead-zirconate-titanate (PZT) struck by high energy electrons. Four 1/2 inch thick disks of PZT were used. A wide band, low impedence, common base configuration amplifier was used to examine the induced vibrations. Since the most prominent resonant frequencies of the disks were near 40 kHz (radial mode) and 158 kHz (compressional mode) most of the studies were concentrated on these modes. Electrons of energy 1.00 BeV and 0.20 BeV were used in pulses, each lasting about 1.0 microsecond and contained 10,000 to 1,000,000 to electrons. The cross section of the incident 1.00 BeV beam was about 3 mm x 3 mm. (Author)

A large double-focusing magnetic spectrometer, capable of analyzing electrons or other singly-charged particles up to a momentum of 1000 Mev/c, was used in studies of electron scattering from protons at incident electron energies of 650 to 900 Mev between scattering angles of 45 and 145 deg . Typical electron peaks are shown. Values are given for scattering angle, cross section, and square of the momentum transfer. (M.C.G.)

A method using an accelerator and thin targets is suggested for investigating very small energy losses in highenergy electron or proton scattering events. (C.E.S.)

While nucleon models previously proposed appear satisfactory, the numerical values of parameters require certain changes. Differences are ascribed to more precise and abundant measurements of electron scattering by hydrogen and deuterium, and improved theory. Data are presented in graphical and tabular forms. (L.N.N.)