Abstract
The radioactive germanium isotope of 1.65-day half-life has been produced by , , and reactions, but not by deuteron bombardment of germanium. This isotope is reassigned and placed at . It decays with emission of positrons, x-rays, and gamma-rays. No evidence for the existence of the 195-day period has been found at by deuteron bombardment of gallium. The characteristic x-ray lines of gallium from decay activity of the 11.4-day have been photographed by a curved crystal camera. Deuteron bombardment of , enriched electromagnetically to 70 percent, has given no evidence of a 9-day period at . The half-life of , produced by fast neutron bombardment of arsenic, is 1.37±0.02 hours. The half-life of , produced by alpha-particle bombardment of zinc, is 3.26±0.02 days.
- Received 19 July 1948
DOI:https://doi.org/10.1103/PhysRev.74.1311
©1948 American Physical Society