An annular magnet has been used to determine the difference in energy of the particles from the ${\mathrm{Be}}^9(d,\alpha ){\mathrm{Li}}^7$ and ${\mathrm{Li}}^6\mathrm{}(d,p)\mathrm{}{\mathrm{Li}}^7$ reactions. These energies have been measured through a direct comparison with the alpha-particles from polonium, and they serve to determine the energy of the level in ${\mathrm{Li}}^7$ excited in these processes. The values obtained are 482±3 kev for the ${\mathrm{Be}}^9(d,\alpha )$ reaction and 483±6 kev for the ${\mathrm{Li}}^6\mathrm{}(d,p)\mathrm{}$ reaction.

• Received 11 August 1948

DOI:https://doi.org/10.1103/PhysRev.74.1569