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Phys. Rev. C 65, 024612 (2002) [7 pages]

Electron-capture delayed fission properties of 244Es

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D. A. Shaughnessy, K. E. Gregorich, J. L. Adams, M. R. Lane*, C. A. Laue†, D. M. Lee, C. A. McGrath‡, V. Ninov, J. B. Patin, D. A. Strellis§, E. R. Sylwester**, P. A. Wilk, and D. C. Hoffman
Nuclear Science Division, Lawrence Berkeley National Laboratory, MS 70A-1150, Berkeley, California 94720
Chemistry Department, University of California, Berkeley, California 94720

Received 22 March 2001; published 25 January 2002

Electron-capture delayed fission was observed in 37-s 244Es produced via the 237Np(12C,5n)244Es reaction at 81 MeV (on target) with a production cross section of 0.31±0.12μb. The kinetic energies of coincident fission fragments were measured with our rotating wheel detection system and the average pre-neutron-emission total kinetic energy of the fragments was found to be 186±19MeV. The mass-yield distribution of the fission fragments is predominantly asymmetric. Based on the ratio of the number of fission events to the measured number of α decays from the electron-capture daughter 244Cf (100% α branch), the probability of delayed fission was determined to be (1.2±0.4)×10-4. This value for the delayed fission probability fits the experimentally observed trend of increasing delayed fission probability with increasing Q value for electron capture.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.024612
DOI:
10.1103/PhysRevC.65.024612
PACS:
21.10.Gv, 23.40.-s, 25.70.Gh, 27.90.+b

*Present address: The College Preparatory School, Oakland, CA 94618.

†Present address: Lawrence Livermore National Laboratory, L-231, Livermore, CA 94551.

‡Present address: Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID 83415.

§Present address: Ancore Corp., 2950 Patrick Henry Dr., Santa Clara, CA 95054.

**Present address: Defense Threat Reduction Agency, 8725 John J. Kingman Rd., Fort Belvoir, VA 22060.

 
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