Other
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvc..41..618h&link_type=abstract
Physical Review C (Nuclear Physics), Volume 41, Issue 2, February 1990, pp.618-630
Other
19
Fission Reactions, Other Topics In Radioactive Decay And In-Beam Spectroscopy, 220<=A, Elementary Particle Processes
Scientific paper
Delayed fission following the electron-capture decay of 234Am was studied. The 237Np(α,7n)234Am reaction with multiple 237Np targets was used to produce 234Am. The fission properties and half-life of 234Am were measured using a rotating-wheel system. The half-life of 234Am was determined to be 2.32+/-0.08 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 173+/-5 MeV. Radiochemical separations confirmed the elemental assignment of the fissioning species to americium or fission from short-lived excited states in its EC daughter, plutonium. The cross section for 234Am produced by this reaction and decaying by electron capture was determined to be 5.4+/-1.3 μb by measuring the intensities of the daughter plutonium K x rays in radiochemically separated americium samples. The branching ratio of the 6.46-MeV α peak of 234Am was found to be (3.9+/-1.2)×10-4 in on-line measurements. The delayed-fission probability was determined to be (6.6+/-1.8)×10-5 from the measured ratio of fissions to plutonium K x rays. The observed fissions were unambiguously assigned to an EC-delayed fission process by measuring fissions coincident with the K-capture x rays.
Baisden P. A.
Chadwick R. B.
Czerwinski K. R.
Gannett C. M.
Gregorich K. E.
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