Abstract
New neutron-deficient nuclides of lutetium and hafnium were produced by bombarding lutetium oxide with 300- to 400-Mev protons. The genetic relationships and mass assignments were established by means of high-purity chemical separations and a series of chemical isolation experiments in which the daughter activity was determined as a function of time.
The positron spectra of the different nuclides were measured with an anthracene crystal detector and a 256-channel pulse height analyzer. Gamma radiation was also observed for , , , , and by means of a NaI crystal detector and the pulse height analyzer. The half-lives and maximum positron energies observed are: , min, Mev; , days; , days, Mev; , min, Mev; , hr; , hr.
- Received 23 January 1961
DOI:https://doi.org/10.1103/PhysRev.122.1558
©1961 American Physical Society