Electroencephalograph (EEG) measures described high- and low-hypnotizable participants in terms of 3 conditions: an initial baseline period; baselines preceding and following a standard hypnotic induction; and during the induction. The following results were obtained. 1. High and low-hypnotic susceptible participants displayed a differential pattern of EEG activity during the baseline period, characterized by greater theta power in the more frontal areas of the cortex for the high-susceptible participants. 2. In the period preceding and following a standardized hypnotic induction, low-susceptible participant displayed an increase in theta activity, whereas high-susceptible participants displayed a decrease. 3. During the actual hypnotic induction itself, theta power significantly increased for both groups in the more posterior areas of the cortex, whereas alpha activity increased across all sites. Implications of these data include the possibility of psychophysiological measures offering a stable marker for hypnotizability, and anterior/posterior cortical differences being more important than hemispheric foci for understanding hypnotic processes.

Elastic scattering of hadrons on protons has been measured at momenta of 50, 100, and 200 GeV/c. The meson-proton scattering is found to be independent of momentum and meson type fort > 0.8 (GeV/c)'.The momentum dependence of the pp dip att = 1.4 (GeV/c)' was investigated. Slope parameters are given.

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The surface diffusion of hydrogen on W field emitters has been investigated by making use of the low vapor pressure and high sticking coefficient of H2 at liquid helium temperature to obtain unilateral contamination. Average values of the energy of desorption of H2 have also been obtained. It is found that spreading occurs in three distinct phases. At very high initial coverages a moving boundary migration occurs below 20°K, corresponding to migration of physically adsorbed H2 on top of the chemisorbed layer, precipitation at its edge, and further migration over the newly covered region. For initial deposits corresponding to ∼1 monolayer spreading sets in at ∼180°K with a boundary moving radially outward from the close-packed 110 faces. The activation energy of this process is ∼6 kcal and corresponds to migration over the smooth (close-packed) regions of the tip followed by precipitation of chemisorbate at trap sites on the rough regions. At coverages too low to permit saturation of traps diffusion out of the latter becomes rate controlling so that boundary free diffusion with E≈9.5 kcal and at even lower coverages with E∼16 kcal is observed. The heat of adsorption of H2 at extremely low coverage is found to be 64 kcal, but drops rapidly with increasing coverage. These results lead to the conclusion that surface heterogeneity is largely the result of surface topography and is inherent on all but the close-packed faces of W. The activation energies for diffusion are found to be 10 to 20% of the binding energy, depending on the nature of the sites. It is also seen from the low-temperature spreading that ∼75% of the chemisorbed layer can be formed below 20°K with effectively zero activation energy, and a large probability factor. The bearing of these results on the mechanism of some catalytic reactions is discussed.

High-energy neutrino experiments in progress at the Argonne zero-gradient synchrotron (ZGS) employ a wide-angle focusing device 1 to enhance the neutrino or antineutrino flux. Existing data 2-4 on particle production by nuclear interactions of high-energy protons are dispersed over a range of primary energies, target materials, production angles, and secondary energies. In order that the resulting flux may be accurately known, a precise measurement of meson production by 12.5-BeV protons on Be has been completed. Pion-production cross sections have been measured over the angular range from 2° to 16°, and at pion momenta from 1 to 12 BeV/cc Data on kaon production were also obtained in a narrower momentum range. Scattered proton fluxes were measured, and are presented here for their value in pratical beam design.A slow extracted proton beam, ~100-msec duration and 12.5-BeV kinetic energy, was focused onto a Be target of 2.8-cm diameter and 10-, 20-, or 40-cm length. For beam extraction, ordinary internal targets, rather than a jump target, were used, resulting in