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    Production of Positron and Electron Pairs by Bombardment of Mercury with β-Particles of Low Energy

    SKOBELZYN and Stepanowa1 have reported the production of positrons when β-particles of energy 1–3 MV. im**e on solid lead. In order to conserve electric charge, the phenomenon rmist have involved the production...

    F. C. CHAMPION, A. BARBER in Nature (1937)