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pair formation

n.
1.the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus

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    Idiom of the Day

    carry coals to Newcastle
    to bring something of which you have much of somewhere, to duplicate something (Newcastle is a town in England where there is much coal)
    Bringing extra food to the farmer`s picnic was like bringing coals to Newcastle.



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    Anna is ________ .

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