Abstract
Electron-capture delayed fission was observed in 26-min {sup 248}Es and 7.7-min {sup 246}Es, which were produced at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron via {sup 249}Cf(p,2n) and {sup 249}Cf(p,4n) reactions at proton energies of 18 and 37 MeV on target, respectively. The delayed fission probabilities were determined to be (3.5{+-}1.8)x10{sup -6} for {sup 248}Es and (3.7{sub -3.0}{sup +8.5})x10{sup -5} for {sup 246}Es. These values were determined in separate experiments using our automated rotating wheel online collection and measurement system. Collection and measurement times were optimized for the isotope being measured. The measured delayed fission probabilities are consistent with the experimentally observed trend of increasing delayed fission probability with increasing Q value for electron capture.
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