The spontaneous-fission half-life for the odd-odd nucleus has been measured by a prompt-neutron fission-fragment coincidence method to be (9.5±3.5)× years. A correlation of experimental spontaneous-fission half-life data for nuclei of all classes was found to be , where takes the values 42.22, 40.67, and 40.40 for even-even, odd-, and odd-odd nuclides, respectively, is the spontaneous-fission half-life in years, and is the mass difference in milli-mass-units (mmu) between the values obtained from Green's smoothly varying mass formula and the experimentally measured values.
- Received 19 September 1966
- Published in the issue dated March 1967
© 1967 The American Physical Society