Abstract
Isotopes of radium lighter than mass 215 were studied by bombardment of with and with . Si(Au) surface-barrier detectors were used in on-line measurements to measure -decay characteristics. Mass-number assignments of through were made on the basis of excitation functions and genetic relationships with francium, emanation, and astatine isotopes. Half-lives and accurate energies were determined for the radium isotopes, and the energy of was corrected. and branchings were measured for and . Some systematic trends in the -decay energies were interpreted in terms of weakening neutron and proton pairing energies near closed shells.
- Received 28 April 1967
DOI:https://doi.org/10.1103/PhysRev.161.1284
©1967 American Physical Society