Electron-capture-delayed fission properties of 232Am

Details Electron-capture-delayed fission properties of 232Am Electron-capture-delayed fission properties of 232Am

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvc..42.1480h&link_type=abstract

Physical Review C (Nuclear Physics), Volume 42, Issue 4, October 1990, pp.1480-1488

Physics

Nuclear Physics

14

Fission Reactions, Gamma Transitions And Level Energies, 220<=A, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

Delayed fission from the electron-capture decay of 232Am was studied. The 237Np(α,9n)232Am reaction with multiple 237Np targets was used to produce 232Am. The fission properties and half-life of 232Am were measured using a rotating-wheel system. The half-life of 232Am was found to be 1.31+/-0.04 min from measurements of the fission activity. A highly asymmetric mass-yield distribution was observed for the fission activity, and the average total kinetic energy of the fission fragments was found to be 174+/-5 MeV. Radiochemical separations confirmed the elemental assignment of the fissioning species to americium or fission following shortly after the decay of americium. The cross section for 232Am produced by this reaction and decaying by electron capture was determined to be 1.3+/-0.2 μb by measuring the intensities of the daughter plutonium K x rays in radiochemically separated americium samples. The delayed-fission probability was found to be (6.9+/-1.0)×10-4 from the measured ratio of fissions to plutonium K x rays. The observed fissions were unambiguously assigned to electron-capture-delayed fission of americium by measuring the time correlation between the plutonium K x rays resulting from americium K capture and the subsequent fission.

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