Abstract
A study of the photo-disintegration of the deuteron using a cloud chamber as a detector has been made for gamma-ray energies of 6.14 and 7.00 Mev from the $F(p,\ensuremath{\alpha}){\mathrm{O}}^{16*}$ reaction. By observing the number of photo-disintegration protons and the number of electron pairs formed in the gas (C${\mathrm{D}}_{4}$) of the cloud chamber, the ratio of the photo-disintegration cross section to the pair cross section is obtained. Assuming a calculated value for the pair cross section these data yield $\ensuremath{\sigma}[D(\ensuremath{\gamma},p)n]=25.7(14 \mathrm{percent}\mathrm{P}.\mathrm{E}.)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}28}$ ${\mathrm{cm}}^{2}$ at an average gamma-ray energy of 6.55 Mev.
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