Large-angle cross sections for yd-^ Tr^Jare systematically measured in the photon energy range between 500 and 1000 MeV. A good fit is obtained by use of a Glauber-model calculation which includes the dibaryon resonances ^F3(2.26) and ^G4(2.51), but the fit has an unusual nature in the role of resonance and nonresonance contributions.

Polymers, such as polyvinyl formal (PVF) and polyvinyl acetate (PVAc), which are insoluble in water, dissolved in anionic surfactant solution. Polymer solutions of PVF, PVAc, and polyvinyl alcohol in surfactant were studied viscometrically and electrophoretically. The polymer forms a complex with the surfactant, the behavior of which is similar to that of polyelectrolyte. The complex is negatively charged and migrates to the anode. With dialysis of the solution of polymer‐surfactant complex against running water, the polymer separates out; however, the polymer does not separate out of undialyzed solution, even if the solution is diluted to far less concentration than the CMC of the surfactant. Thus the dissolution of the polymers in the surfactant solution is due to the oriented adsorption of surfactant ions on the polymer molecule. The amount of adsorbed surfactant ions was estimated. The adsorption might be of the Langumuir type.

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A miniaturized electron probe X-ray microanalyzer (EPMA) with a small chamber including the electron source and the sample stage was realized using a pyroelectric crystal as an electron source. The EPMA we propose is the smallest reported so far. Performance of the EPMA was evaluated by investigating energy of obtained continuous X-rays and lower detection limits of transition metals (titanium, iron, and nickel). End point energy (Duane-Hunt limit) of continuous X-rays of 45 keV was obtained. However, it is expected that the EPMA can analyze characteristic X-rays with energy less than 20 keV. The EPMA was able to measure titanium, iron, and nickel wires whose projected areas were more than 0.03 mm(2).

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