Electron-capture delayed fission properties of 244Es

Journal Article · Fri Mar 16 04:00:00 EST 2001

OSTI ID:843126

Shaughnessy, Dawn A ^[1]; Gregorich, Kenneth E; Adams, Jeb L; Lane, Michael R; Laue, Carola A; Lee, Diana M; McGrath, Christopher A; Ninov, Victor; Patin, Joshua B; Strellis, Dan A; Sylwester, Eric R; Wilk, Philip A; Hoffman, Darleane C

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1. LBNL Library

Electron-capture delayed fission was observed in {sup 244}Es produced via the {sup 237}Np({sup 12}C,5n){sup 244}Es reaction at 81 MeV (on target) with a production cross section of 0.31{+-}0.12 {micro}b. The mass-yield distribution of the fission fragments is highly asymmetric. The average preneutron-emission total kinetic energy of the fragments was measured to be 186{+-}19 MeV. Based on the ratio of the number of fission events to the measured number of {alpha} decays from the electron-capture daughter {sup 244}Cf (100% {alpha} branch), the probability of delayed fission was determined to be (1.2{+-}0.4) x 10{sup -4}. This value for the delayed fission probability fits the experimentally observed trend of increasing delayed fission probability with increasing Q value for electron-capture.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 843126
• Report Number(s): LBNL--47235
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
DISTRIBUTION
ELECTRON CAPTURE
FISSION
FISSION FRAGMENTS
KINETIC ENERGY
PROBABILITY
PRODUCTION
Q-VALUE