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Aluminum bombarded by 2. 2 mv deutons is found to emit protons, neutrons and alpha-particles, presumably accompanying reactions in which Al^28 (radio-aluminum), Si^28 and Mg^25 are formed. The protons are the most abundant (about 8 per 10^7 deutons) and have a complex spectrum of ranges, in which groups with ranges 10, 21, 30 and 53 cm have been resolved. The maximum range of 62 cm corresponds to a reaction energy of 5. 3 mv. The radioactive product, shown chemically to be an aluminum isotope, decays with a half-life of 1565 sec. , emitting negative electrons and intense gamma-rays. The maximum range of the electrons is 0. 95 g/cm^2 of Al, corresponding to an energy limit of 2 mv. The excitation curve for the radioactivity agrees with Gamow's theory of nuclear penetration. The alpha-particles have a range of 6. 5 cm, giving a reaction energy of 6. 6 mv for the formation of Mg^25. They are only 1/100 as abundant as the protons.
McMillan et al. (1935) studied this question.