Abstract
A technique is described for studying nuclear reactions in which short range alpha-particles are produced with a yield that is too small for the direct application of the electrostatic deflector. In preliminary experiments a strong polonium source is used to supply alpha-particles to the deflector, and a group of these alphas, homogeneous in energy, passes through the deflector and enters a variable pressure absorption cell and ionization chamber. Cut-off pressures determined for various alpha-particle energies result in a calibrated cell which can then be used to determine the alpha-particle energies in nuclear disintegrations. Application of this method to ${\mathrm{Li}}^{6}(p,\ensuremath{\alpha}){\mathrm{He}}^{3}$ results in a $Q$ value of 3.94\ifmmode\pm\else\textpm\fi{}0.08 Mev. The calibration, extending in alpha-particle energy from 1 to 1.8 Mev, is also used to determine the slope of the range energy curve. The average value of the slope found for this region is 200 kv per mm range.
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