The Transmutation of Sulphur by Th C' Alpha-Particles

The protons emitted from sulphur under bombardment of Th C' alpha-particles have been resolved into three groups corresponding to nuclear energy changes -2.4±{}0.3, -2.85±{}0.3 and -3.6±{}0.3 MEV. The first of these values, together with Bainbridge's value for the mass of Cl³⁵, has been used to deduce a value for the mass of S³², namely 31.9812±{}0.0016. An excitation curve for the emission of protons has been plotted which obeys the Gamow penetration formula within the limits of error: from this formula the nuclear radius of S³² has been derived and has the value 5.4±{}0.3×{}10^-13 cm.