Critical reflection of neutrons from a soap film

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Abstract

For the first time, neutrons have been critically reflected from a soap film. In addition, interference fringes were also measured from whose spacing the thickness of the film could be determined. Because the film solution consisted of hydrogeneous surfactant in deuterated water, the measured thickness corresponded to that of the aqueous core of the film. Hitherto it has not been possible to measure the core thickness directly. The rate of thinning was also measured from the variation of the spacing of the interference fringes with time.

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