9,225 research outputs found

    Fragmentation of positronium in collision with He atoms

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    The absolute cross section for the fragmentation of positronium in collision with He atoms has been measured. The results are compared with available theories. The longitudinal energy distributions of positrons resulting from fragmentation have also been determined and are found to display a peak situated just below half the residual energy. This is suggestive of the occurrence of "electron loss to the continuum" in which the two residual charged particles lie in a low relative-velocity Coulomb-continuum state

    The processing of unfermented peach juice

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    Investigators are generally convinced that the utilization of peaches in the production of juice would be desirable. Howerer, many investigators differ concerning the best type of juice to prepare and the varieties most desirable for its production. Some feel that the mere application of the basic principles involved in preparation and preservation of fruit juices now on the market will not produce a satisfactory product; others feel that the peach is too deficient in flavor and odor for juice production. Experiments which have furnished the data for this report were initiated in an attempt to find more conclusive evidence to answer these questions

    Lane Distribution

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    Grooving of Pavements

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    Median Design and Accident History

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    Experimental tests of reaction rate theory: Mu+H2 and Mu+D2

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    Copyright @ 1987 American Institute of Physics.Bimolecular rate constants for the thermal chemical reactions of muonium (Mu) with hydrogen and deuterium—Mu+H2→MuH+H and Mu+D2→MuD+D—over the temperature range 473–843 K are reported. The Arrhenius parameters and 1σ uncertainties for the H2 reaction are log A (cm3 molecule-1 s-1)=-9.605±0.074 and Ea =13.29±0.22 kcal mol-1, while for D2 the values are -9.67±0.12 and 14.73±0.40, respectively. These results are significantly more precise than those reported earlier by Garner et al. For the Mu reaction with H2 our results are in excellent agreement with the 3D quantum mechanical calculations of Schatz on the Liu–Siegbahn–Truhlar–Horowitz potential surface, but the data for both reactions compare less favorably with variational transition-state theory, particularly at the lower temperatures.NSERC (Canada) and the Petroleum Research Foundation of the Americal Chemical Society
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