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The Production of Radium E and Radium F (Polonium) from Bismuth

1940; American Institute of Physics; Volume: 57; Issue: 5 Linguagem: Inglês

10.1103/physrev.57.371

1536-6065

J. M. Cork, J. P. Halpern, H. E. Tatel,

Nuclear reactor physics and engineering

It is shown that when bismuth is bombarded with 10-Mev deuterons both radium E and radium F are formed. The former corresponds to a neutron capture and the latter to the capture of a proton. The yield of each product is found as a function of the exciting energy. At 10 Mev the yield of radium F is less than one-fourth of that of radium E. Since the possibility of a neutron and a proton leaving the nucleus should be almost equally probable, this is evidence that the deuteron as a whole has a low probability of entering the nucleus but rather obeys an Oppenheimer-Phillips process. The cross sections for the formation of radium E and radium F at 10 Mev are 4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}28}$ ${\mathrm{cm}}^{2}$ and 9\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}29}$ ${\mathrm{cm}}^{2}$, respectively.