Electron-capture delayed fission properties of neutron-deficient einsteinium nuclei
D. A. Shaughnessy, University of California, Berkeley (Degree granting institution)
Electron-capture delayed fission (ECDF) properties of neutron-deficient einsteinium isotopes were investigated using a combination of chemical separations and on-line radiation detection methods. 242Es was produced via the 233U(14N,5n)242 Es reaction at a beam energy of 87 MeV (on target) in the lab system, and was found to decay with a half-life of 11 +/- 3 seconds. The ECDF of 242Es showed a highly asymmetric mass distribution with an average pre-neutron emission total kinetic energy (TKE) of 183 +/- 18 MeV. The probability of delayed fission (PDF) was measured to be 0.006 +/- 0.002. In conjunction with this experiment, the excitation functions of the 233U(14N, xn)247-xEs and 233U(15N, xn)248-xEs reactions were measured for 243Es, 244Es and 245Es at projectile energies between 80 MeV and 100 MeV
Thesis, Dissertation, English, 2000