Tin has been bombarded with 5 MEV deuterons and chemically analyzed for transmutation into radioactive indium, tin and antimony isotopes. The indium fraction exhibits a strong electron emission of 26±2 hours' half-life and an extremely weak activity of undetermined sign and with half-life probably several months. The tin precipitate emits an intense electron group with half-life 28±2 hours and a weak activity also of several months period. Two antimony isotopes are formed with half-lives of 13.3±1 hours and 112±30 days. The former gives evidence of being a branching decay, both electrons and positrons being observed; the sign of the longer period has not been determined. Short period activities from bombarded tin are of 12±2 minutes' and 45±5 minutes' half-life. Absorption curves in aluminum are given and the possible transmutations that are responsible are discussed.

• Received 29 June 1936

DOI:https://doi.org/10.1103/PhysRev.50.435