Two new alpha activities with half-lives of 25 and 9 min have been observed in reaction of heavy ions with a variety of heavy targets. The 25-min activity was found by combined radiochemical methods and mass separations to be an isomer in ${}_{}{}^{212}{}_{}{}^{}\mathrm{Bi}$; the 9-min activity is also likely to be an isomer in ${}_{}{}^{212}{}_{}{}^{}\mathrm{Bi}$.

• Received 1 May 1978

DOI:https://doi.org/10.1103/PhysRevLett.41.738