Electron-capture delayed fission properties of neutron-deficient einsteinium nuclei

Thesis/Dissertation · Fri Dec 31 23:00:00 EST 1999

DOI:https://doi.org/10.2172/754277· OSTI ID:754277

Shaughnessy, Dawn A. ^[1]

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1. Univ. of California, Berkeley, CA (United States); LBNL Library

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)²⁴²Es 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 (P_DF) 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-x}Es reactions were measured for ²⁴³Es, ²⁴⁴Es and ²⁴⁵Es at projectile energies between 80 MeV and 100 MeV.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 754277
• Report Number(s): LBNL--44776
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EINSTEINIUM ISOTOPES
ELECTRON REACTIONS
FISSION
HALF-LIFE
ISOTOPE PRODUCTION
NITROGEN 14 REACTIONS
URANIUM 233 TARGET