Disintegration Experiments on the Separated Isotopes of Lithium

Observations made with targets of 18 micrograms of ${\mathrm{Li}}^6$ and 200 micrograms of ${\mathrm{Li}}^7$ under proton and deuteron bombardment have given the following results. (1) Two groups of protons with mean ranges of 25.4 cm and 29.6 cm air-equivalent are emitted by ${\mathrm{Li}}^6$ under deuteron bombardment at 540 kv. No group of such range was found for ${\mathrm{Li}}^7$ under similar conditions. (2) Neutrons are emitted by ${\mathrm{Li}}^6$ under deuteron bombardment at 300 kv and above. (3) Short period beta-ray activity was observed from ${\mathrm{Li}}^7$ under deuteron bombardment at 500 kv and above with no observable activity from ${\mathrm{Li}}^6$ under similar conditions. (4) Gamma-rays are emitted by ${\mathrm{Li}}^7$ under proton bombardment in the neighborhood of 450 kv and of 1000 kv, with no observable gamma-rays or neutrons emitted from ${\mathrm{Li}}^6$ with protons of these energies.