Abstract
The half-life of has been determined and an upper limit has been set for the half-life of . An additional short-lived chain collateral to the actinium natural radioactive family has also been partially identified. This chain decays as follows: →→→→ →.
- Received 15 October 1951
DOI:https://doi.org/10.1103/PhysRev.85.429
©1952 American Physical Society