Abstract
Using the expansion-chamber method, ninety proton tracks are obtained from 850 photographs showing the disintegration of nitrogen under bombardment by slow
α
-particles. The number of disintegrations decreases as the energy of the
α
-particles is reduced, but the photographs show disintegrations occurring for energies less than 1.7 MeV. The angular distribution is approximately isotropic for the protons ejected by
α
-particles of energy less than 3 MeV, but there is a marked preponderance at about 90° for the protons ejected by
α
-particles of range about 2 cm. in air at N. T. P. Typical photographs are reproduced.
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